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

Pitley · Member

Starts but wont rev out

chrisstdt · Senior Member

Hi ,does it have a switch on the side stand ? they can give trouble

TT-R250M · Super Guru

chrisstdt wrote:
Hi ,does it have a switch on the side stand ? they can give trouble

The side-stands function is to stop an owner riding off with the stand down. It will only have an effect as soon as you put it in gear, not as you start to open it to full throttle.

I would say that it is running rich myself, either that or there is something loose in the carb. I would meticulously check the carb for loose jets or screws, if that does not help, try raising the jet needle clip position.

Also, make sure that the accelerator nozzle is not blocked and squirts fuel when the throttle is applied. More info on the carb HERE

Jarrah

andy m · Member

I know this is the bike and with the mileage nothing should be worn in the carb? lu

ttr250.activeboard.com/t57535636/tt250r-for-sale-sold/

TT-R250M · Super Guru

andy m wrote:
I know this is the bike and with the mileage nothing should be worn in the carb? lu

ttr250.activeboard.com/t57535636/tt250r-for-sale-sold/

Did someone say that the carb was worn or are you just making an unrelated statement?

Jarrah

Pitley · Member

Il check these things today, must say the carb did squirt fuel when I lifted the slide with my finger. Pretty sure its not running rich, its more like the ignition not advancing as the motor revs out. Do the ignition systems give any trouble on these bikes?. Cant see the problem being the stand switch either but il try it.Thanks

TTRfan · Super Guru

Fuel starvation caused by a blockage or the one-way valve in the filler cap jammed?

Loosen the float bowl drain valve - do you get a good flow of petrol?

Brian

Pitley · Member

Thanks Brian, il give it a go just now

TTRfan · Super Guru

Don't smoke whilst you are doing it wink

TT-R250M · Super Guru

If it doesn't have good fuel flow, the problem will not only be at full throttle, it will also effect the idle and off idle. It can even stall and not start without the use of choke. Somehow I think it is not fuel flow and it is running rich.

Any other symptoms?

Here is a link to another owner that was pretty sure it wasn't running rich- HERE

Jarrah

TTRfan · Super Guru

Just trying to clear the obvious out the way Jarrah wink

Plus it's a very simple check that also makes sure the drain screw isn't seized - method in my madness eh?

Brian

andy m · Member

Sorry, I was flitting between forums last night, both carb related threads. I realise no one said it was worn.

TT-R250M · Super Guru

andy m wrote:
Sorry, I was flitting between forums last night, both carb related threads. I realise no one said it was worn.

Fair enough, it had me wondering!

All good!

Jarrah

Pitley · Member

TTRfan wrote:
Just trying to clear the obvious out the way Jarrah
Plus it's a very simple check that also makes sure the drain screw isn't seized - method in my madness eh?
Brian

Drain plug seized n rounded hmm . What next folks?

TTRfan · Super Guru

Sorry about that but better you find out now than after you have dunked the TTR in a ford and need to drain the carb blankstare

Next time you have the carb off, fix it as per here

New drain screws available here

Any problems, just ask...

Brian

Pitley · Member

Seems easy enough smile , thanks.

Il put the order in now wink

TT-R250M · Super Guru

I give up giving advice when it is ignored.

Enjoy your problem.

Jarrah

Pitley · Member

TT-R250M wrote:
I give up giving advice when it is ignored.
Enjoy your problem.
Jarrah

Not had chance to take your advice yet chap, had the drain plug issue then got called out to a broken boiler. Your advice has not been ignored

TT-R250M · Super Guru

Well it's good to know that you at least acknowledged 30 mins of my time.

Jarrah

TT-R250M · Super Guru

TTRfan wrote:
Fuel starvation caused by a blockage or the one-way valve in the filler cap jammed?
Loosen the float bowl drain valve - do you get a good flow of petrol?
Brian

An easier way to check would be to loosen the fuel cap and see if the problem is still there. Also removing the fuel line will confirm a good fuel flow or not. It will not help if the needle and seat or the filter inside the seat (AKA needle valve) is blocked though. However, since you spent so much time cleaning and you have not reported any other symptoms, I doubt it will be blocked.

Just some more info to disregard. wink

Jarrah

PS. Interestingly enough, the previous owner states- ''It's a 53 plate in blue, pretty standard bike apart from ally bars, leaver guards with indicators, CRD front pipe and custom "bash" plate all original spares come with the bike + an FMF "silencer" '''... Wonder if the PO remembered to swap the jets back to standard and if the standard exhaust is being used?

Pitley · Member

Thanks Jarrah, just back in again! Il check the running with the fuel cap loose, valve seems to work when blown and sucked( excuse the innuendo). the fuel runs free when the pipe is removed from the tap, tried that earlier. Got andy m coming round in a bit to see what he thinks, let you know later

Andy

claytronic · Veteran Member

hi.did you find a solution to your problem.i think i might have the same problem.

clayton