Hello.. heellp!! I have an srx250 (yamaha), '85.. i use for commuting to from work (+- 70 kms return) in Adelaide.. by the time im gettng home or to work, at traffic lights, the bike instead of idleing..starts revving higher and higher..i have to either engage it in gear and half let go, to slow th engine down.. or even kill it... Ive notice it usually happens when the weather is hot... bloody embarrasing when you stop next to a car, people look at you saying " oh yeah.. nice little old bike.." and then th stupid thing starts screaming at about 7-8 thsnd revs!!! let alone thinkng what if the clutch snaps....oh look at th nice little bike..plasterered on that truck!! When cold..it idles at 1-2000, when hot up to 3, but now, after 30 k's of city riding.. every time I stop...it jumps up.. I used to use high octane (93-95)petrol...until I was told to just use 91...done. I am currently using synthetic automotive oil (10-30), as I was told it would be good for it.. maybe that has smthng to do with it... Ill start by chnging oil & filter this weekend..maybe ill folllow on that thread and try diesel oil?? I dont know what to try.. it definitely stresses an old engine.. have put enough money on it that it still has payed itself off.. dont want to blow it.. I checked the carb..(visually) and throttle and return seems to work ok.. I do know the CDI is old and looks like crap.. a new one is about $400, ive only found one at a wrecker for 100,l but he's had it sitting outside for like a year, still on the wreck... so i dont want to change it unless I really have to.. So...I DON'T KNOW WHAT TO CHECK.... Hopefully the mixture of clever brains present in this forum can guide me...(sucking up time!!!) Thanks anyway!!!