282 replies to this topic

[drewpy]

another thought, did you balance the carbs?
did a search in this topic and nothing came up.

 

mine were snuffling a bit till the carbs were balanced

 

I have a set of carb balancers if you want me to nip over with them

[Dickiebig]

I have a spare CDI unit untested or you could whip the one off my bike to try.
Also a stator should you wish to try. Only in Gloucester, the city it's self

[dablik]

Keep at it Dabs, you'll get there in the end.

You sooo much need a shed with a good light....

 

Cheers Dave i'll find the problem, just slower than most, often end up checking twice, or 3 times, or, well you get the drift 

another thought, did you balance the carbs?
did a search in this topic and nothing came up.

 

mine were snuffling a bit till the carbs were balanced

 

I have a set of carb balancers if you want me to nip over with them

Set the balancers up drew but struggled to get her running even enough to balance, had to keep fiddling with the idle screw which made adjusting the sync screw problematic, was a bit pissed off at this point and walked away so may well be worth another effort..

I have a spare CDI unit untested or you could whip the one off my bike to try.
Also a stator should you wish to try. Only in Gloucester, the city it's self

 

Dickie i may well take you up on the offer a bit later on regards the CDI unit if all else fails, appreciate that  Have a spare Stator to hand from a Mk2 but without the pick up coil..

[dablik]

It would'nt surprise me either to find the problem may end up being summit i've missed during checking things out and another go round may often spot the culprit, my biggest worry is something has gone amiss engine wise after a rebuild but am sitting on the fence with that one and hoping summit has'nt gone awry after 300 miles.. 

[Gdogg]

Can’t wait for the book to come out dabbs, what’s the title gonna be ? .......
“Fu*#k sake what next?” The joys of restoring a TDM 850 MK1
LOL !!!

[dablik]

Can’t wait for the book to come out dabbs, what’s the title gonna be ? .......
“Fu*#k sake what next?” The joys of restoring a TDM 850 MK1
LOL !!!

 

       it's the no shed/garage just amplifies the problem ya bollocks 

 

 

Actually chaps what i've failed to mention is how the problem manifests, can start cold with choke no problem (which i thought should rule out vacuum leak!!) and after only a couple of minutes warming up the antics begin. Oops 

[Studley Ramrod]

Could be a rich problem if the problem gets worse. Sticky/twisted choke cable ? Or, possibly a faulty coil. Or, some electrical connection worsening when warmed up ?

Yeah, leaky vac pipe shows itself on tickover regardless of choke or no choke.

[dablik]

Think i'll be taking a closer look at the choke, seemed okay, but that would also be on both carbs with the problem so i think unlikely !! will look anyhow..coil is a new replacement, wot ya reckon it's summit stupid i've overlooked 

[Bjørge]

Think i'll be taking a closer look at the choke, seemed okay, but that would also be on both carbs with the problem so i think unlikely !! will look anyhow..coil is a new replacement, wot ya reckon it's summit stupid i've overlooked 

 

I've worked as a repairman for many years, and my experience it that the unlikely happens. Not all the time, but not never. 

 

Sometimes you get there by strict cause->effect thinking. But every now and then, forget what you think is the row of events leading to where you are and start analysing as if you had absolutely no idea what started the problem and what has been done to the bike in order to get it going.

 

Like check / change spark plugs.

 

When I tried to get my old carbs working and struggling with a leaky tank cap it started skipping one cylinder (also after a warmup period, mind you). Nothing to do with water or debris in fuel, as I first thought. Us humans tend to overthink chains of events, always looking for the reason behind things. 

 

Best of luck!

Edited by Bjørge, 12 May 2021 - 08:47 am.

[drewpy]

Is this you Cliff at night? 

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[dapleb]

Not loikely to be timing or oubt either hey if probs only appear after several minwits

[dablik]

 

I've worked as a repairman for many years, and my experience it that the unlikely happens. Not all the time, but not never. 

 

Sometimes you get there by strict cause->effect thinking. But every now and then, forget what you think is the row of events leading to where you are and start analysing as if you had absolutely no idea what started the problem and what has been done to the bike in order to get it going.

 

Like check / change spark plugs.

 

When I tried to get my old carbs working and struggling with a leaky tank cap it started skipping one cylinder (also after a warmup period, mind you). Nothing to do with water or debris in fuel, as I first thought. Us humans tend to overthink chains of events, always looking for the reason behind things. 

 

Best of luck!

 

Never was a truer word spoken Bjorge and your so right, dunno how my brain works when problem solving these issues which is why as i mentioned it's usually a couple of times around until i find the problem, very easy to overlook something, the good thing about this thread though is i will run through it and compile a list to systematically check through..

Not loikely to be timing or oubt either hey if probs only appear after several minwits

 

Good point Batman, makes sense now you mention it    

Is this you Cliff at night? 

 

NOT if she was in bed with me Drew, be munching through little blue tablets    .....it sure is me, much worse when i was rebuilding though 

Edited by dablik, 12 May 2021 - 04:20 pm.

[Studley Ramrod]

I remember working on Skippy's mk1, it was running roungh on one cyl even after he'd fitted new plugs.  Turned out to be a duff new spark plug.  Doubt he'd ever have found that but as I was new on the job, I checked for a spark and bingobangobongo !  Mechanics allus throwing a curve ball or dishing up a red herring.

[dablik]

Took me multimeter to Halfrauds i did and tested the boogers, was only 2 on the shelf 

[Studley Ramrod]

[Matlock]

My God Cliff, you are suffering with that bike   . You broke a mirror, or shot any albatrosses recently? For my tuppence worth, if you’ve swapped the carbs and still have exactly the same issue, it’s very unlikely to be the carbs. The choke thing does make it sound fuel related though, bangin' & fartin' is incomplete combustion, does it smell of fuel when it's doing this? Both headers heating up consistently? I’d be checking all the fuel system thoroughly. Those bloody carb rubbers Yamaha use are crap, even when new, they’d be my chief suspects. I bought a pattern set for the Tenere once and they weren’t a good fit. Maybe get some new jubilee clips on them so you’re confident they’re airtight and ain't moving anywhere? Check the inlet stubs on the head too for damage, cracks, etc. too.

 

Put yer new glasses on and rig up some good lighting and check everything visually. Wheel it in the kitchen while SWMBO is out. She’s a good woman, she’d understand…..

[Favs]

You could be up for Heavyweight er umm I mean Middleweight Fettler of the Year Award Cliff.

[Snowbird]

Took me multimeter to Halfrauds i did and tested the boogers, was only 2 on the shelf 

No good checking plugs with a multimeter, a megger might show up problems though.

[fixitsan]

No good checking plugs with a multimeter, a megger might show up problems though.

 

I thought that too, and a few months ago was reminded that some sparkers have resistors.

Apparently the DPR8ea-9 has a 5kohm resistor in there

https://www.opieoils...-electrode.aspx

 

What if the plugs were knock-off, maybe have the wrong resistor or none at all

 

 

NGK recommend not using the wrong plug, if the spec requires resistor plugs then you need to use them

https://www.ngk.com/...stor-spark-plug

 

The OEM DPR8EA9 spark plug is a resistor plug

 

"Use of non-resistor plugs in vehicles that call for a resistor type can result in rough idling, high-rpm misfire, and abnormal combustion."

Edited by fixitsan, 13 May 2021 - 05:28 pm.

[dablik]

My God Cliff, you are suffering with that bike   . You broke a mirror, or shot any albatrosses recently? For my tuppence worth, if you’ve swapped the carbs and still have exactly the same issue, it’s very unlikely to be the carbs. The choke thing does make it sound fuel related though, bangin' & fartin' is incomplete combustion, does it smell of fuel when it's doing this? Both headers heating up consistently? I’d be checking all the fuel system thoroughly. Those bloody carb rubbers Yamaha use are crap, even when new, they’d be my chief suspects. I bought a pattern set for the Tenere once and they weren’t a good fit. Maybe get some new jubilee clips on them so you’re confident they’re airtight and ain't moving anywhere? Check the inlet stubs on the head too for damage, cracks, etc. too.

 

Put yer new glasses on and rig up some good lighting and check everything visually. Wheel it in the kitchen while SWMBO is out. She’s a good woman, she’d understand…..

 

Retribution from the Tdm god for sending a 9r down the road and dumping her in Spain 

Does'nt smell of fuel funny enough, i mean i have the sniffles but cant smell fuel when i stick me conker near the end of the exhaust, woudl'nt surprise me to find a crack someplace either after the bangs i've had, headers heating up okay and the inlet rubbers are 300 mile old aftermarket jobbies, clips are years old though, Inlet stubs and cracks, okie doke another check on the list, cheers Chris..

No good checking plugs with a multimeter, a megger might show up problems though.

 

Silly fookers need to stop You tubing the idea then.... 

 

I thought that too, and a few months ago was reminded that some sparkers have resistors.

Apparently the DPR8ea-9 has a 5kohm resistor in there

https://www.opieoils...-electrode.aspx

 

What if the plugs were knock-off, maybe have the wrong resistor or none at all

 

 

NGK recommend not using the wrong plug, if the spec requires resistor plugs then you need to use them

https://www.ngk.com/...stor-spark-plug

 

The OEM DPR8EA9 spark plug is a resistor plug

 

"Use of non-resistor plugs in vehicles that call for a resistor type can result in rough idling, high-rpm misfire, and abnormal combustion."

 

Ta Chris, i'm aware the plugs use resistors and i have the correct plugs ngk plugs fitted, reason i took me multimeter cos i know there are some flakes floating about, actually have about 3 or 4 sets so can swap, aint buying more..

You could be up for Heavyweight er umm I mean Middleweight Fettler of the Year Award Cliff.

 

 

I'm just waiting for the certificate medal to arrive Al