Ok just went out for a blat and bike died on me... basically it will tick over but dies if I rev it....she won't even pull off.
I had a problem with her a few weeks ago that when I reved her I had a flat spot when I grabbed a fist full but I thought maybe previos owner had old fuel in it.... Any way I'm guessing crap in the carb???
My mates got a sonic cleaner so I guess maybe take it to him....and other thoughts??
An easy first check is to loosen the petrol tank cap just in case the valve has corroded and got stuck thus not letting air in.
Otherwise, just make sure that you have petrol flowing into the carb. Put a rag under the carb, put out any naked flames or cigarettes, and open the drain valve on the float bowl to make sure petrol is getting into the carb.
If that works OK then you probably have the common problem caused by TTRs being laid up for a while, which is a blocked or partially blocked pilot jet. Sonic cleaning doesn't always work on them so be prepared to put a bit of copper wire through to clear any possible obstruction.
If the carb hasn't been apart for a while you may need a new float bowl gasket as they flatten over time and it's annoying to put the carb and airbox back on only to find the gasket is leaking
KThanks again Brian....will do the checks you said then strip her down..
It did have this flat spot that seemed to solve itself so maybe the start of a blocked jet.... ?
I didn't realise how quick fuel goes off these days.... Shell say 3 to 4 weeks 😨.... I bought additive for mine from now on to save all this messing..
Dave
Ok nearly gott her together and I managed to strip this.... I was being so careful but the air box is a bit of a pig to line up the bolts.... crappy threads but ain't doing up now😕 any suggestions?
Longer bolt with washer in air box?? A so took lots of pics but not quite sure of the breather routes??
Yeah - they can be difficult to line up whilst trying to get the intake rubber to sit properly on the carb
Is the nut turning in its slot or are the threads definitely stripped on it?
The nut will pull out of the side of its slot. Yamaha doesn't sell them separately but if its stripped then I probably have a good spare if you want one?
I have seen the box drilled to do what you suggest but it's easier to keep it standard.
Use a bit of copper grease on the others to keep them sweet
To be honest I thought it was just straight into the plastic...maybe the nuts dislodged? It was getting late and I was being hassled to finish up so I just packed up.... Have you got any photos of the breather runs ? I took some but not very clear... also think the one way valves have been removed??? I don't know why people mess with stuff and don't put it back?? D
Thanks Brian thats really useful.. Ive got the route at the carb end just how/where they then go.... mine go into clear pipes so obviously messed with...They then goto the right of the cdi..?)
Mine are to the seat bolt post then two lines go into 2 clear pipes as my photo which also go under the seat with no valve??? Do the one way valve just dangle loose??? Can you buy the one way valves and or breathers?
I'm determined to get this bike how yammy designed it Ta d
The inside breather with one-way valve dangles down between the frame and crankcase as shown in photo below:
The outside one is shown in the photo in my previous post. It clips to the emulsifier pipe although it isn't clipped on in that photo although it shows the clip on the breather pipe.
The one-way valves are available from Yamaha at £12.68 inc VAT.
If you want s/h, I have some spare pipes and one-way valves I think. Just let me know what you are missing.
Well thanks for all the advice and help😉
I've got her back together and she started great.... The throttles not returning so have ordered a cable oiler as the cables are dry and see if that helps.
A steep learning curve but really enjoyed the tinkering.
Thank goodness for this forum though!!
Ttr fan you're a star if I ever get a chance a beers coming your way.
👍
Dave
Well thanks for all the advice and help😉 I've got her back together and she started great.... The throttles not returning so have ordered a cable oiler as the cables are dry and see if that helps. A steep learning curve but really enjoyed the tinkering. Thank goodness for this forum though!! Ttr fan you're a star if I ever get a chance a beers coming your way. 👍 Dave
Watch out with the cable oiling, i think if they're teflon coated cables they're not supposed to be oiled, but can be cleaned through with WD40
Moo is absolutely right about not oiling Teflon lined cables. I didn't know this until we started buying Venhill cables and read their instructions
Remember that cables are service parts, the same as chains and sprockets and should be replaced after a while. Not sure how long that might be though! I guess when the Teflon has worn through and I suppose the only way to tell that is when the clutch or throttle action starts to deteriorate.
I recall a post that said that a rich mixture can cause a TTR not to return to idle quickly..... Can't vouch for it though....