Bike hard to start, and will stall if not revved. Backfiring etc?
If not, project tdm for sale!!!
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Is This The Problem?
Started by
itchyfeet2
, Feb 25 2018 01:04 pm
12 replies to this topic
#1
itchyfeet2
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Carpe Regular
- Location:Stonehenge
- TDM model: 1992
Posted 25 February 2018 - 01:04 pm
Do you think this split in the inlet rubber from my carb is big enough to cause my poor running?
Bike hard to start, and will stall if not revved. Backfiring etc?
If not, project tdm for sale!!!
Bike hard to start, and will stall if not revved. Backfiring etc?
If not, project tdm for sale!!!
#2
dapleb
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Monkey Boy
- Location:The home of morris dancin
- TDM model: 1990
Posted 25 February 2018 - 01:12 pm
Looks like it seals above that spot?
"Whats up", "Piston Broke", "Yeah me too...hic"
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
#3
itchyfeet2
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Carpe Regular
- Location:Stonehenge
- TDM model: 1992
Posted 25 February 2018 - 02:18 pm
Yeah, there are two splits, not the best pic I know. The splits don’t go down past the inner seal but if it’s not this I’m stumped. Had carbs open, no probs with float bowl and diaphragms intact. It sounds like air getting in. I’ll have another look at all hoses.
#4
dapleb
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- Root Admin(A)
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Monkey Boy
- Location:The home of morris dancin
- TDM model: 1990
Posted 25 February 2018 - 02:42 pm
Worth eliminating whilst ewe in dare.
How's yer carb to hairbox rubbers?
How's yer carb to hairbox rubbers?
"Whats up", "Piston Broke", "Yeah me too...hic"
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
#5
Studley Ramrod
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Monkey Boys Monkey
- Location:HELLO ! I'm in the Library...Notts
- TDM model: 1993
Posted 25 February 2018 - 03:09 pm
Might be worth removing the clips to see if there are any more cracks in the rubbers. Some crack around the rubber, under the clips.
Mk2a 2000 in Silver. Top end Refurb @ 41100 miles, Scottoiler, Renthal Road High Bars, Up & Back Bar Risers, Bellypan, DL650 Handguards, Capt. Picard Bar Ends, House of Henty SS Wheel spacers, New Seat Cover Fitted. 58 MPG !! Now owned by chrisbee ! Studley's mk2a Bloggerydoodaah ! Photos of my first MK1 Photos of my MK2a TPLQHCSRSFC No. 1 Fan
#6
itchyfeet2
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Carpe Regular
- Location:Stonehenge
- TDM model: 1992
Posted 25 February 2018 - 03:44 pm
Thanks guys. Air box rubbers look good but there is a mastic type seal from rubber to air box which has deteriorated.
Under the block to carb rubber clips, there is a lot of hidden cracks. Difficult to say whether they go right through or not.
There are two rubber tubes attached the the inlet stubs. I can’t find any perishing on them though.what about the gaskets themselves between inlet stub and block? If I disturb them I’ll have to change them?
Under the block to carb rubber clips, there is a lot of hidden cracks. Difficult to say whether they go right through or not.
There are two rubber tubes attached the the inlet stubs. I can’t find any perishing on them though.what about the gaskets themselves between inlet stub and block? If I disturb them I’ll have to change them?
#7
itchyfeet2
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Carpe Regular
- Location:Stonehenge
- TDM model: 1992
Posted 25 February 2018 - 04:28 pm
There are loads of these cracks but only one rubber has them. I'll get two new ones and give it another go.
oh well another week in the car then! Photos are quite poor really, in real life these cracks are really pronounced
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Edited by itchyfeet2, 25 February 2018 - 04:29 pm.
#8
thelodger
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Carpe fan
- Location:euxton
- TDM model: 2010
Posted 25 February 2018 - 04:44 pm
Get the bike running at tickover. Spray the areas where you think the rubbers might be leaking with something like WD40 to see if it makes any difference to the tickover. If it does you clearly have a leak
A typical symptom of airleaks would be a reluctance for the revs to drop quickly after revving from tickover ( bike in neutral) .
#9
itchyfeet2
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Carpe Regular
- Location:Stonehenge
- TDM model: 1992
Posted 26 February 2018 - 12:09 pm
Dont think my knuckles to take putting it back together to check. Ill just replace at this point.
Interesting you said revs would hang if an air leak. Mines not doing that, its just hard to start, wont run without stalling if you dont rev it and pops constantly even at tickover. Though that might be an air leak causing that.
Interesting you said revs would hang if an air leak. Mines not doing that, its just hard to start, wont run without stalling if you dont rev it and pops constantly even at tickover. Though that might be an air leak causing that.
#10
thelodger
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Carpe fan
- Location:euxton
- TDM model: 2010
Posted 26 February 2018 - 12:14 pm
I don't think an airleak alone would cause all the problems you have described. I think there is something else going on - which sounds carb related to me.
#11
thelodger
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Carpe fan
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- TDM model: 2010
Posted 26 February 2018 - 12:21 pm
I don't know about 850s or their carbs so I may be talking BS but my experience elsewhere suggests this could be a pilot jet / primary circuit blockage. Flooding might give some similar symptoms but you haven't described a strong smell of petrol so I ere towards a pilot jet type problem
Edited by thelodger, 26 February 2018 - 12:23 pm.
#12
Studley Ramrod
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Monkey Boys Monkey
- Location:HELLO ! I'm in the Library...Notts
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Posted 26 February 2018 - 02:38 pm
Are you using the choke to help start it ? Also, is the tickover high enough ?
Mk2a 2000 in Silver. Top end Refurb @ 41100 miles, Scottoiler, Renthal Road High Bars, Up & Back Bar Risers, Bellypan, DL650 Handguards, Capt. Picard Bar Ends, House of Henty SS Wheel spacers, New Seat Cover Fitted. 58 MPG !! Now owned by chrisbee ! Studley's mk2a Bloggerydoodaah ! Photos of my first MK1 Photos of my MK2a TPLQHCSRSFC No. 1 Fan
#13
drewpy
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has been here 4ever
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Posted 26 February 2018 - 03:37 pm
put choke and see if that improves the running. then you know you are weak
"As I Lay Rubber down to street, I pray for traction I can keep. But if I skid and begin to slide, please dear god protect my ride"
Mods; Oil pressure switch, neoprene rear inner mudguard, scottoiler, highway pegs, fenda extenda, 1999 carbs and airbox, Kais suspension setup, later clutch springs, LED lamps, Metmachex swingarm, Hagon Shock, Oxford heated grips, 4 way fused accessory Bus, 17" 3CV front wheel, Michellin R6 tyres, GPS speedo, 5' ignition advance.
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