Yamaha TRX850 Enthusiasts Forum

Not ridden my bike for a while due to winter and a huge work project. It had fresh V power fuel put in and I have started it up a few time and taken it for the odd short ride over winter.

Anyway I went to start it now the weather is nice and it started fine as usual. However as it starts to warm up and I put the choke in it will idle for about 15 seconds then slowly start to lower its rpm till the point it cuts out.

It re-starts fine if I twist the throttle and I can keep the bike running fine if I hold the revs with the throttle.

I don't know much about carbs so I was wondering if I could be pointed in the right direction of where to start looking.

Thanks

sounds like a kink in the fuel hose

you could try raising the tickover also

what dose it idle at with the choke on and warm?

I raised the idle all the way to 1500 rpm and it idled for longer (about a minute) but still cut out in the end. I'm going to take the tank off tonight and have a look around at hoses and to see if there is any air or fuel leaks.

I've read about fuel going bad if left, is 4 months long enough to make fresh fuel go off?

yes 4 months is long enough, especially if there is not a lot of fuel in it

Won't idle when hot point to rich mixture - check air filter isn't blocked / blinded with dirt, check the choke isn't sticking on - that happened to me once - freed it off and lubricated all OK after. Worn needles / emulsion jets Shouldnt effect tickover. but wrong float hights or float stuck might

Drained tank and put some fresh fluid in and seems to be working for now.
Need to get it insured and MOT'd and take it for a good ride.

And thanks for the help