97 yamaha won't stay running

sti1471

Petty Officer 1st Class
Joined
Aug 2, 2011
Messages
312
ok, I need some help with this issue. I have a 1097 yamaha wave venture 760. I got it 5 years ago and it has ran amazing from day 1. The last time I had them at the lake, it ran perfect. However for the last 2 years, it has sat on the trailer. So I am getting it ready to take out on the lake, but the machine won't stay running.

I took the carbs off, cleaned the jets, needles, cleaned all the ports, carb cleaner, compressed air, the whole works. I also cleaned the fuel pumps. the pop off pressure is 50 on the front carb, and 45 on the rear. Both cylinders compression is 125 psi. I installed a new fuel filter, drained the tanks and put new oil and fuel in each tank

Installed the carbs, and the machine would not start. I poured some pre-mix into the carbs, and the machine fired right up. When I blip the throttle, it responds without hesitation. After about 8 seconds, the engine dies whether I'm reving it or not. After the engine dies, I cannot start it again without dumping fuel in the carbs. It seems as though the engine is not getting fuel. However, the fuel filter is full of fuel, i have tried all 3 positions on the fuel peacock. When I blow air into the fuel filter line, I can hear fuel bubbling in the tank. So I took the carbs back off, and when I opened the fuel pumps again, fuel poured out. When I opened the carbs, fuel poured out, so I know fuel is making it to the carbs. I am at a loss as to why the machine is not getting fuel or what else to check
 

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,286
You have the fuel filter going the right direction ? Very common for it to be the wrong way round. Easily done.
 
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