cheesehead4
Cadet
- Joined
- Jun 26, 2007
- Messages
- 17
I'm new to this group and have enjoyed your forums. I've now come across something I'm having trouble fixing/troubleshooting. Please help.
Here goes. 86 25-ESJ Yamaha. Main trouble. Engine has great hole shot but will not come up to speed. Compression is very close to 120 in both cylinders. Carb has been cleaned and set. (It was VERY clean. Engine/fuel is well maintained.) New spark plugs. Fuel bulb is firm and squeezing it has no effect on the running engine. Tank vent is open and clear. Fuel filter and lines are clean and open.
It's seems to be maybe electrical in nature like timing is not advancing. Just opening the throttle to WO with out advancing the ign. gives me obvious low performance but allowing timing advancement seems to not help alot either. The timing ring does move to the stop position at WO throttle. It comes up to about a mid speed then just settles in there. It's running smooth......It just will not speed up. Any help will be appreciated. Thank You.
Here goes. 86 25-ESJ Yamaha. Main trouble. Engine has great hole shot but will not come up to speed. Compression is very close to 120 in both cylinders. Carb has been cleaned and set. (It was VERY clean. Engine/fuel is well maintained.) New spark plugs. Fuel bulb is firm and squeezing it has no effect on the running engine. Tank vent is open and clear. Fuel filter and lines are clean and open.
It's seems to be maybe electrical in nature like timing is not advancing. Just opening the throttle to WO with out advancing the ign. gives me obvious low performance but allowing timing advancement seems to not help alot either. The timing ring does move to the stop position at WO throttle. It comes up to about a mid speed then just settles in there. It's running smooth......It just will not speed up. Any help will be appreciated. Thank You.