bananaman

hey guys - thank you very much for all the help. The engine had a professional rebuild and rebore with new seals etc. it had two new reeds put in one i noticed was upside down so i have turned it over, and then the bike started. i have checked the float height and is okay. It seems when you open the throttle the engine sounds like it 4 strokes and stutters, but is fine just on tick over although it sounds like it is hunting for fuel a little bit. I wonder if these knew type carbs, which seem to use different jets to the old ones and do not even have a inlet anymore for the old style oil pumps, may not suit the TY250's? A friend said to me a delauto carb from a gasgas works okay, but i have had no experience of this?! Any more advice would be greatly accepted.. Thanks again Brian

no, just kinda gets worse and the bike stops. The carb only has a throttle stop screw and an air jet. Thanks

Hi mate, Yes, I did wonder if that maybe the case, the carb is new and is suppose to be jetted up to suit. I removed the air filter, which did improve for a couple of minutes but still 4 stroked a lot. I wonder do i need to change a jet to a smaller one or maybe change the float arm angle? We checked the spark plug and tried a new one, but that made little difference. The 2 stroke mix is 100ml of semi synthetic off road oil to 5ltrs thanks Brian

Hi Guys - hoping someone has some advice please - am restoring a TY250 twinshock, 1978 and have got a new makuni carb from Alan's performance and it just will not rev out. Starts fine, but every time you open the throttle it just will not rev and makes like a 4-stroking sound. Tried moving the needle about but just cannot seem to cure it. Anybody managed to fix this sort of problem? Cheers. Brian.