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

wobbly · Senior Member

Starting problems

Kaos · Senior Member

I'd say check your valve clearances, in my experience hard starting cold has usually been valves. How long since they were checked.

And jetting. And spark. Hows the spark plug look.

wobbly · Senior Member

Never checked since I,v owned it, but apparently done by previous owner and I have done approx 3000 mls since ownership.
Spark plug looks ok but changed anyway................... fuel ???? same fuel in tank for 18 months due to bike not being used.

Dan-in-a-Van · Veteran Member

I'd empty the tank and put in a gallon of fresh petrol.

http://armchairbiker.com/ethanol-in-petrol-what-classic-bikers-need-to-know/

wobbly · Senior Member

Great link Dan, first thing I,ll be doing tomorrow is draining the fuel before I go any deeper.

Kaos · Senior Member

Drain the carb, put the fuel in the mower, fresh fuel I'd say it will go 1st time.
If it doesn't run quite right the jets might have gummed up and need a clean.

ttboof · Super Guru

i add a splash of injector cleaner in the tank every now and then , had the carby apart after 4 years and its clean as a whistle . i have a feeling Australian fuel is more stable and doesn't turn to gunk like elsewhere though .

Kaos · Senior Member

ttboof wrote:
i have a feeling Australian fuel is more stable and doesn't turn to gunk like elsewhere though .

It still loses its mojo after a couple of months though. The only time I have hard starting bikes is with stale fuel. Put in fresh juice and they always fire up easier.

ttboof · Super Guru

So true I always try and park it near empty but rarley more than a week or so

Kaos · Senior Member

Long term I try and leave it full, I figure more fuel takes a lot longer to go off. For example I probably won't ride over Jan and Feb, its too hot and the bush is too dry. So my tanks full, come autumn I'll chuck the fuel into the ride on mower and fill up the bikes with fresh juice. And I've just about worn out the carb drain screw on mine letting out the old fuel so a new one is on order.

wobbly · Senior Member

Well I drained all the petrol this morning including the carb and filled up with fresh, and bingo the old girl started first time on choke from cold without stopping.
Took her down some local lanes left her later on for a around 3 hours, started the motor again and she started instantly with no cutting out issues.
Got the engine nice and hot and changed the oil and filtre ready for some new year riding.

Well thanks for all the input and advice.... much appreciated I need a dunces hat to think fuel would keep for 18 months.

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Ttboof · Senior Member

mine would start then stop with no spark , in the case it was the ign pick up , i bought one on line and fitted it , lasted 5 years and have just put a second one in. about an hour's work.

just up under the tank the stator harness plugs in , there is a small plug with 2 wires the check is that the resistance reading across the terminals should be close to 200ohms. in my case it was open circuit, not saying it's your problem bur might be worth checking the trick is to catch it when it's failed as they like to read ok but go open circuit with a bit of temp in them .( the one i just replaced tests ok just failed to keep running one day shortly after starting and a very occasionally had a miss fire for a split second )

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