A forum for owners of Yamaha TTR250 trail and enduro bikes!

Dodgyrider · Newbie

Hi from leafy Stafford

peteBLUEttr · Super Guru

Hi Glen! Welcome to the forum! My mate who I mostly ride with also has a Serow and a Street! With regard to your problems, maybe checking the valve clearances may help? The vibration is coming from the engine yeah?

Baggers · Senior Member

Hi Glen, Welcome to the forum, regarding the Stopping, it may well be worth checking out the carb, to check there is no crud in it and that the jets are nice and clean, for info, I am from South Manchester and do quite a bit of green laneing in the peak district if you ever fancy coming along :)

locky · Guru

Welcome to the forum, i'd also be checking the carb first.

Dodgyrider · Newbie

Hi. Thanks for the welcomes and the advice.

The vibration seems to be from the engine but is felt through pegs and bars. Will try a few more things and hope that it clears up.

Will get over to the Peaks soon Rick and will get in touch. Will also be going to the High Peaks and Potteries TRF meet sometime soon too.

Thanks to all

peteBLUEttr · Super Guru

I'm sure you are not stupid enough to have the chain too tight being that you have a RSV. The engine has good compression?

wink

TTRfan · Super Guru

Hi Glen and welcome to the forum!

Ref the stalling, do the easy stuff first. Make sure the air filter is clean and properly fitted and the air screw is properly set. Undo the carb bowl drain screw (with a good fitting screwdriver so that you don't strip it) and drain through a bit of petrol to make sure its all clean in there. Also check that the filler cap is letting in air and not vacuuming.

Ref the vibration, do the simple check first which is to make sure all the engine bolts are done up tight. Don't know how they can work loose but they occasionally do and can give rise to vibration.

Brian

thesproutsofwrath · Veteran Member

Welcome to the forum Glen. Enjoy the TTR experience.

Dodgyrider · Newbie

Hi. Thanks for all the advice and welcomes.

As a matter of interest I seem to have cured the vibration by checking all bolts as advised and decided to take the carb off and clean it thoroughly. It now goes a lot better although after prolonged speed of around 130 it stutters - Before it could only manage about 100 so I am quite happy with that. Engine response is better too so I guess that there was some muck in the carb somewhere and I re-adjusted the main screw at bottom of carb (Knurled nut one).

Looking forward to getting out on some green lanes soon. We are popping over to The High Peaks and Potteries TRF group tonight to see what is about.

(BTW, that's kph, not mph!!)

Glen

Dion · Member

Hi Glen,

Im also new to the group having been a 'watcher' for a few years decided to join a great group.

With regard to your stalling issue, I have experienced this occasionally on my 2000 TTR. I have a theory

that when cutting the throttle after a high engine speed run resulting in a

momentary over-rich mixture the spark plug fouls slightly and the engine runs rough or dies. I experienced this more when I had the stock exhaust fitted to my machine but now hardly ever, which I think also pointed at too richer mixture.

I agree with Brian's advice and also suggest you replace your spark plug, noting the condition of the old one when you remove it (blackened?).

I had better results with NGK plugs over the alternative Nippon Denso twin earth type. Another thing I found was to ensure the idle speed is not set too low.

Hope this might help further,

Regards,

Dion smile