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..
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
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?
Yamaha Ty250 New Carb Problem
in Yamaha
Posted
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