mattmahon10

Hi all, Can anyone tell me what liquid to use in the clutch for a 2008 4rt? my cap says mineral oil and it had a green seal underneath however everywhere i look it suggests that it should be dot 4? Im wondering if a previous user swapped the cap out for whatever reason. Thanks Matt

Update I got to run the bike this weekend on a wet cold welsh day. Bike started ok however it kept dying in the morning no matter how many revs i tried to give it. After adjusting the air screw out quite a bit possibly up to 4 turns out and adjusted the idle to a little quicker the bike ran well all afternoon. This spark plug was brand new when i started the day. Does anyone have any idea if this is a normal or good colour plug after a days trialing

Where would i check this?

Rev 3 Slow to return to idle help There you go guys. Please let me know if thats returning to idle as it should. sorry it was so short it I only had time to do this later in the evening.

I will post a video of the issue tomorrow. And ill let you tell me if im overreacting because as i say i dont really know how these things are meant to run. Ive always been a road biker

the air screw doesnt seem to adjust much at all. Im running a 150 jet, would you recommend changing a jet? if so which one and size?

Hi all, The saga continues unfortunately. Ive removed the flywheel and renewed the crankshaft seal and then tried it without and with the flywheel weight to see if it makes any difference. Unfortunately the bike is still taking way too long to return to idle after giving it some revs (Trying this all in neutral). Im toying with the ideal of just swapping the whole carb out to see if that'll make any difference. Probably a like for like mikuni. Again im all out of ideas

Yeah I can hear the clonk back at the carb. After reading this ive stripped the throttle twist grip and cleaned it all up. It hasnt solved the main problem but least i can rule that one out.

I never thought of this! I will check it when I can get it off next week

Im certainly not very experienced. I have all the manuals for the bike but it never covers much in detail. I have a screw only for air and a screw for idle speed. The bike doesnt cut out or even change engine note even when the screw is all the way theres not much i can do there till i find the problem. Will be removing the fly wheel this week and changing the crankshaft seal just to rule it out

Crankshaft seal/bearing or did you mean the crankcase seal? Sorry if thats a stupid question im a complete novice here

How would i do this? I think the mikuni i have only lets you regulate the air

Hi all, Ive been working on my 2006 beta rev 3 trails bike for days now trying to find the cause for an issue im having. Bike runs and idles ok although the exhaust does pop a little but im unsure if this is normal with it being a two stroke. The issue im having is that when i rev it up even on the stand and in neutral, the bike takes way longer than expected to return back down to idle. Ive chased a whole host of potential problems and I cant seem to find any faults. ive checked the airbox for cracks or holes and found none, ive checked the airbox to carb rubber boot and found no issues there and then ive taken the carb apart and cleaned out all the ports by spraying carb cleaner down them and cleaner comes out of the ports(at the other end). Ive checked and resealed the carb to engine rubber hard boot too and that seems fine. throttle cable seems fine although the snap back at the carb (mikuni) isnt as sharp as i thought it would be but it does shut quickly. The research i have done suggests air is coming in somewhere but i cant see where?or how? Does anyone have any suggestions to what it could be?