hi when i start my trials bike i let it warm up until the colling fan kicks in but im practicing so when i try to balance at a slow speed i keep very little revs on and it cuts out is there anything i can do to improve this alo when im riding over like logs and **** and if i go too slow it will cut out again the revs will just stop and it will start to splutter :/ is this a problem fixable without new parts or ?

hi when i start my trials bike i let it warm up until the colling fan kicks in but im practicing so when i try to balance at a slow speed i keep very little revs on and it cuts out is there anything i can do to improve this alo when im riding over like logs and **** and if i go too slow it will cut out again the revs will just stop and it will start to splutter :/ is this a problem fixable without new parts or ?

Probably just a through cleaning and checking of the carb and a mixture screw adjustment would fix the problem.

Usually a tune-up (carb, filter, plug etc.) and adjustment will prevent this from happening in the future.

Jon

increase the idle screw a half turn at a time untill i stops cutting out

thanks guys ill be taking it to bits today to change the bearings also it has just had a new plug and i lately stripped down the carb and rebuilt it so ill try and adjust the screws also which one do i adjust the one on the left or the centre one?

The one you can do without any tools. It's a knurrled (sp) screw. I'd also check the other stuff above and get the mixture right. The mixture screw is the only to the left of the idle screw and needs a small screwdriver to adjust. Get the bike warm and leaving it ticking over (adjust the idle if it wont) then turn mixture screw either way until you get the best (highest speed) idle. You're now very close. Give the throttle a blip or two and adjust very small amounts again to see if you can improve it still.

If we knew which bike it was we'd be able to give you a pretty good starting point for the mixture screw. Usually about 2 turns out from fully screwed in.

The one you can do without any tools. It's a knurrled (sp) screw. I'd also check the other stuff above and get the mixture right. The mixture screw is the only to the left of the idle screw and needs a small screwdriver to adjust. Get the bike warm and leaving it ticking over (adjust the idle if it wont) then turn mixture screw either way until you get the best (highest speed) idle. You're now very close. Give the throttle a blip or two and adjust very small amounts again to see if you can improve it still.

If we knew which bike it was we'd be able to give you a pretty good starting point for the mixture screw. Usually about 2 turns out from fully screwed in.

hi yes sorry its the 1996 gas gas jtr 250cc

hi yes sorry its the 1996 gas gas jtr 250cc

On the 96', you'll probably want to start at 3 or 3 1/2 turns out.

Jon