Hello everyone, I'm from washington state, on the other side of the "pond" Anyways, I've been looking at a 92 tdm 850, and was looking over all the articles, but was confused about the purpose of the emulsion tube? Does it house the needle? How does it wear? Can I buy the original one from yamaha, or mikuni? Also, is there any cam chain tensioner problems with this engine? Thanks.
Looking to buy a tdm, but I am confused?
Started by
plkracer
, Apr 21 2008 08:59 am
12 replies to this topic
#1
plkracer
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- Members
- 3 posts
arrived on last train
- TDM model: none yet
Posted 21 April 2008 - 08:59 am
#2
Hawmaw
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- Member
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- 933 posts
900 going for ... 1000cc?
- Location:Renfrew , Scotland
- TDM model: 1998
Posted 21 April 2008 - 09:14 am
Hi welcome to Carpe.
You're correct , the emulsion tube is where the needle slides in and out and over time the tube becomes oval causing rough running and increased fuel consumption. My bike has done 33000 miles and is fine but on some other bikes they have worn out by 20000. They can be purchased from Yamaha and can be fitted by a reasonably competent home mechanic although it takes a while to get the bike apart and back together again.
As for the timing chain tensioner , I don't think there have been many problems. The main thing with the TDM is to keep an
eye on the oil level. Some use quite a lot , others , like mine don't use much at all. If it drops too low it can cause big end and crank failure.
If you keep the oil level up and change the oil and filter level regularily then the motor shouldn't break.
The regulator/rectifier on the Mk1 has been known to fail. Again , these are available and easy to fit.
If the bike you're looking at is in good condition and doesn't smoke or rattle I would consider it.
I'm sure the others will be along with more advice.
You're correct , the emulsion tube is where the needle slides in and out and over time the tube becomes oval causing rough running and increased fuel consumption. My bike has done 33000 miles and is fine but on some other bikes they have worn out by 20000. They can be purchased from Yamaha and can be fitted by a reasonably competent home mechanic although it takes a while to get the bike apart and back together again.
As for the timing chain tensioner , I don't think there have been many problems. The main thing with the TDM is to keep an
eye on the oil level. Some use quite a lot , others , like mine don't use much at all. If it drops too low it can cause big end and crank failure.
If you keep the oil level up and change the oil and filter level regularily then the motor shouldn't break.
The regulator/rectifier on the Mk1 has been known to fail. Again , these are available and easy to fit.
If the bike you're looking at is in good condition and doesn't smoke or rattle I would consider it.
I'm sure the others will be along with more advice.
Now : Nowt
Then : Yamaha TDM850 4TX , Suzuki GSF1200N Bandit , Yamaha TDM850 3VD , Yamaha 600 Fazer , Suzuki GSXR750G , Honda CB1100F , BMW R75/5 , Yamaha RD250E , Yamaha XS250 , Kawasaki Z250C , Lambretta GP150 , Vespa 150 Super
#3
Pict
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- Member
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- 6,257 posts
Keep on keepin' on
- Location:North Herts., UK
- TDM model: 2006
Posted 21 April 2008 - 09:19 am
QUOTE(plkracer @ Mon 21st Apr 2008, 09:44 AM) <{POST_SNAPBACK}>
Hello everyone, I'm from washington state, on the other side of the "pond" Anyways, I've been looking at a 92 tdm 850, and was looking over all the articles, but was confused about the purpose of the emulsion tube? Does it house the needle? How does it wear? Can I buy the original one from yamaha, or mikuni? Also, is there any cam chain tensioner problems with this engine? Thanks.
Hi and welcome
You're right as to purpose: for tube location see post #15 in this thread: http://www.carpe-tdm...o...c=6596&st=0
Replacement is "traditionally" best with Factory Pro tubes (from Straightline Racing: Carpe discount) together with Yamaha OEM needles.
More expert answers will follow
Edited by Pict, 21 April 2008 - 09:22 am.
"It's a TDM, Jim, but not as we know it"
www.youtube.com/watch?v=RAHmEWim3to
Diamond black TDM 900A TRIKE, 2006 ABS model converted by Trike Design (Caerphilly, South Wales) prior to first registration in March 2007.
#4
ChrisG
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- Supporting Member(thanks)
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- 8,276 posts
Resident vulture
- Location:Netherlands
- TDM model: 2009
Posted 21 April 2008 - 09:21 am
Hi and welcome.
The Emulsion Tubes are also known as Needle Jets. They're the bit the needle sits in to meter the fuel flow. I guess the reason they wear must be vibration of the needle against it. They end up with a slightly oval hole instead of a circle, and the engine runs rich as a result. The usual replacement are the ones made by Factory Pro (believe they're an American company so should be easily avaialble over there), which are made of a harder metal and don't seem to wear in the same way. I replaced mine at 52000 miles and it's made a noticable difference to my fuel economy and improved the power at low revs.
I think I'm the only person on the forum who's had problems with the cam chain tensioner on a Mk1. Somehow the spring on the ratchet has managed to jam the ratchet so it won't auto tension. When I heard the chain starting to knock a bit I simply pulled the tensioner out, freed it, and put it back in. It may well have jammed again in which eventually I'll start to hear it knocking as it loosens up and will have to do the same if I don't get round to replacing it first.
Other things to check are:
Oil consumption - they all use oil, half a litre per thousand miles is fairly common. Much more than that could indicate someone let it get low and caused some damage.
Front sprocket nut - some have had problems with the front sprocket nut comming loose, only seems to have occoured with aftermarket sprockets though.
Regulator/rectifier - If it fails it will fry the battery, might be worth checking the voltages.
The Emulsion Tubes are also known as Needle Jets. They're the bit the needle sits in to meter the fuel flow. I guess the reason they wear must be vibration of the needle against it. They end up with a slightly oval hole instead of a circle, and the engine runs rich as a result. The usual replacement are the ones made by Factory Pro (believe they're an American company so should be easily avaialble over there), which are made of a harder metal and don't seem to wear in the same way. I replaced mine at 52000 miles and it's made a noticable difference to my fuel economy and improved the power at low revs.
I think I'm the only person on the forum who's had problems with the cam chain tensioner on a Mk1. Somehow the spring on the ratchet has managed to jam the ratchet so it won't auto tension. When I heard the chain starting to knock a bit I simply pulled the tensioner out, freed it, and put it back in. It may well have jammed again in which eventually I'll start to hear it knocking as it loosens up and will have to do the same if I don't get round to replacing it first.
Other things to check are:
Oil consumption - they all use oil, half a litre per thousand miles is fairly common. Much more than that could indicate someone let it get low and caused some damage.
Front sprocket nut - some have had problems with the front sprocket nut comming loose, only seems to have occoured with aftermarket sprockets though.
Regulator/rectifier - If it fails it will fry the battery, might be worth checking the voltages.
Edited by ChrisG, 21 April 2008 - 09:25 am.
1992 Mk1, 76k miles, Hagon springs, MTC exhaust, 4½ gears Gone now 
2009 900 abs, 42k miles, Yamaha heated grips, double bubble screen, R&G crash bungs, scottoiler, Autocom, 1500 lumen LED spotlights.
#5
jht
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- Member
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- 1,769 posts
has been here 4ever
- Location:surrey/hants border
- TDM model: 1996
Posted 21 April 2008 - 11:11 am
Everyfink wot he said above
Ye gods Chris, I do believe some stuff is starting to rub off on to ya!!
Edited by jht, 21 April 2008 - 11:13 am.
Done: Homo sap navigation/ twisty thing on bars to make it go vroom/ grabby thing to make it stop (in front of twisty thing)/ 'leccy things front and rear to make it glow at night/ Sucky + drippy oiler thing to keep chains moist (!!) / Laser Pro Stock Race pipes / bleeding ear drums (see previous mod)
To do: Educate homo sap nav system to operate twisty + grabby things/ get ear plugs
All Trashed Now... Pants... its a Cat B Mwahahaha it lives again!!
Remember every driver is a deaf myoptic twat who is out to kill you, ALWAYS assume they are going to do THE most f*cking DUMBASS, STUPID manouver possible, at the worst possible moment; get past, and get past quick
To do: Educate homo sap nav system to operate twisty + grabby things/ get ear plugs
Remember every driver is a deaf myoptic twat who is out to kill you, ALWAYS assume they are going to do THE most f*cking DUMBASS, STUPID manouver possible, at the worst possible moment; get past, and get past quick
#6
TonyDevil
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- Supporting Member(thanks)
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- 9,336 posts
seagull squadron leader & founding member of GoatTracKrew
- Location:Saarfend-on-Sea, Essex
- TDM model: 1991
Posted 21 April 2008 - 11:28 am
wot ChrisG & the others said 
"Never argue with an idiot. They just bring you down to their level and beat you with experience"
My TDM :
Black 1991 850 MK1, 160k+ miles(ish, best guess really, gave up trying to keep count after 3rd set of clocks and 3rd engine), PilotRoad2 tyres, custom stubby exhaust system, bluespot calipers & goodridge braided hoses with dunlopads, maxton forks, Ohlins shock, kedo handguards, stainless TDM grill, Scottoiler with lubetube & dual nozzle thingy, Givi Wingrack2 with E45 & 2xE36s, renntec crash bars, Autocom with blueteeth & PMR radio, TomTom Rider2, Optimate IIIsp, Bagster tank cover, anti-dazzle coating
to fit : led spotlights, heated grips, new braided lines and rear caliper that actually has bleed nipples
Silver-ish 2003 900, 70k miles, PilotRoad3 front tyre (new@65k) & PR2 rear(new at 69k), Renthal 755 bars with KTM handguards, oxford unheated grips, power commander 3usb, scorpion titanium exhausts, standard screen with vario winglet thingy, stainless grill, oem centre stand, bagster tank cover, givi monokey topplate mounted on grabrail with V46 topbox, Givi PL pannier rails with E21s, crash bungs, mirror extender thingys, Halfords Advanced Laser Blue brillance bulbs, 21w led spotlights, touring scottoiler with leehenty dual nozzle, Autocom with blueteeth & PMR radio, TomTom Rider3 Urban, winter style anti-dazzle coating
to fit : led brake light strip, replacement heated grips
current rides : TDM850 3vd/mk1=tourer&scratcher, TRX850=weekend twisty toy, 2003 TDM900=commuter, 2005 TDM900=unmolested. Gone but not forgotton : XTZ750=overland touring toy, GS500e, GS125
If a strange looking truck driver honks at you & gives you the thumbs up, its could be me 
#7
ChrisG
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- Supporting Member(thanks)
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- 8,276 posts
Resident vulture
- Location:Netherlands
- TDM model: 2009
Posted 21 April 2008 - 11:38 am
QUOTE(jht @ Mon 21st Apr 2008, 11:56 AM) <{POST_SNAPBACK}>
Ye gods Chris, I do believe some stuff is starting to rub off on to ya!!
You have taught me well master
1992 Mk1, 76k miles, Hagon springs, MTC exhaust, 4½ gears Gone now
2009 900 abs, 42k miles, Yamaha heated grips, double bubble screen, R&G crash bungs, scottoiler, Autocom, 1500 lumen LED spotlights.
#8
jht
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- Member
-
- 1,769 posts
has been here 4ever
- Location:surrey/hants border
- TDM model: 1996
Posted 21 April 2008 - 12:58 pm
the force is strong in this one
Done: Homo sap navigation/ twisty thing on bars to make it go vroom/ grabby thing to make it stop (in front of twisty thing)/ 'leccy things front and rear to make it glow at night/ Sucky + drippy oiler thing to keep chains moist (!!) / Laser Pro Stock Race pipes / bleeding ear drums (see previous mod)
To do: Educate homo sap nav system to operate twisty + grabby things/ get ear plugs
All Trashed Now... Pants... its a Cat B Mwahahaha it lives again!!
Remember every driver is a deaf myoptic twat who is out to kill you, ALWAYS assume they are going to do THE most f*cking DUMBASS, STUPID manouver possible, at the worst possible moment; get past, and get past quick
To do: Educate homo sap nav system to operate twisty + grabby things/ get ear plugs
Remember every driver is a deaf myoptic twat who is out to kill you, ALWAYS assume they are going to do THE most f*cking DUMBASS, STUPID manouver possible, at the worst possible moment; get past, and get past quick
#9
plkracer
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- Members
- 3 posts
arrived on last train
- TDM model: none yet
Posted 21 April 2008 - 06:54 pm
Cool, I will have to check fuel consumption and see what the bike gets, and replace them from there. What is the "big end"? Is that the top end?
#10
Jankers
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- Member
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- 428 posts
Carpe junky
- Location:Sunderland. UK
- TDM model: 2000
Posted 21 April 2008 - 07:47 pm
'Big End', generally refers to the crank/flywheel assembly.
Located in the bottom of the engine below the pistons, pistons connect to it via the con-rod(s).
J.
Located in the bottom of the engine below the pistons, pistons connect to it via the con-rod(s).
J.
#11
plkracer
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- Members
- 3 posts
arrived on last train
- TDM model: none yet
Posted 21 April 2008 - 09:50 pm
Ok, I've been seeing it everywhere, and coming from the states, I've never heard it. It's top and bottom end over here. I'm pretty mechanically inclined, and have been riding off road motorcycles and quads for 9+ years, but i am looking for something that will get me from school and back to home on the weekends.
#12
ChrisG
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- Supporting Member(thanks)
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- 8,276 posts
Resident vulture
- Location:Netherlands
- TDM model: 2009
Posted 21 April 2008 - 10:10 pm
Two countries seperated by a common language 
1992 Mk1, 76k miles, Hagon springs, MTC exhaust, 4½ gears Gone now
2009 900 abs, 42k miles, Yamaha heated grips, double bubble screen, R&G crash bungs, scottoiler, Autocom, 1500 lumen LED spotlights.
#13
TonyDevil
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- Supporting Member(thanks)
-
- 9,336 posts
seagull squadron leader & founding member of GoatTracKrew
- Location:Saarfend-on-Sea, Essex
- TDM model: 1991
Posted 22 April 2008 - 09:05 am
QUOTE(plkracer @ Mon 21st Apr 2008, 10:35 PM) <{POST_SNAPBACK}>
but i am looking for something that will get me from school and back to home on the weekends.
it'll do that
"Never argue with an idiot. They just bring you down to their level and beat you with experience"
My TDM :
Black 1991 850 MK1, 160k+ miles(ish, best guess really, gave up trying to keep count after 3rd set of clocks and 3rd engine), PilotRoad2 tyres, custom stubby exhaust system, bluespot calipers & goodridge braided hoses with dunlopads, maxton forks, Ohlins shock, kedo handguards, stainless TDM grill, Scottoiler with lubetube & dual nozzle thingy, Givi Wingrack2 with E45 & 2xE36s, renntec crash bars, Autocom with blueteeth & PMR radio, TomTom Rider2, Optimate IIIsp, Bagster tank cover, anti-dazzle coating
to fit : led spotlights, heated grips, new braided lines and rear caliper that actually has bleed nipples
Silver-ish 2003 900, 70k miles, PilotRoad3 front tyre (new@65k) & PR2 rear(new at 69k), Renthal 755 bars with KTM handguards, oxford unheated grips, power commander 3usb, scorpion titanium exhausts, standard screen with vario winglet thingy, stainless grill, oem centre stand, bagster tank cover, givi monokey topplate mounted on grabrail with V46 topbox, Givi PL pannier rails with E21s, crash bungs, mirror extender thingys, Halfords Advanced Laser Blue brillance bulbs, 21w led spotlights, touring scottoiler with leehenty dual nozzle, Autocom with blueteeth & PMR radio, TomTom Rider3 Urban, winter style anti-dazzle coating
to fit : led brake light strip, replacement heated grips
current rides : TDM850 3vd/mk1=tourer&scratcher, TRX850=weekend twisty toy, 2003 TDM900=commuter, 2005 TDM900=unmolested. Gone but not forgotton : XTZ750=overland touring toy, GS500e, GS125
If a strange looking truck driver honks at you & gives you the thumbs up, its could be me
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