1987 Yamaha Moto 4 acceleration trouble.
#1
1987 Yamaha Moto 4 acceleration trouble.
Hi guys. Hope you can help. I recently bought a 1987 yamaha moto 4 350 that had been sitting for about 3 years. It belonged to a lady whose husband had passed away and she just wanted it gone. I took it home, cleaned the carburetor, changed the gas and it fired up. The bike idles well and it will rev up with a smooth acceleration, but if I snap the throttle open it just quits. I've played with it and noticed that the problem is from about 1/8th throttle to 1/4 throttle. After 1/4 throttle if I snap it, it opens up fine. I noticed that occasionally it will backfire through the carb also.
So I ordered a carb kit for it, and while I was waiting for the kit to come I left the carb soaking in a carb gunk/premium gas bath for several days and before I installed the new parts I used tip cleaners (that welders use) and compressed air to make sure the carb veins were clear. I bought the repair manual and it says to set the float between 11.4 mm and 13.4 mm so I split the difference and set it at 12mm. It also has an adjustable jet needle and I put the clip on the middle notch, the same as where the old one was.
I have now put it back together and it still does the same thing. Do you guys have any ideas on what else to look at?
So I ordered a carb kit for it, and while I was waiting for the kit to come I left the carb soaking in a carb gunk/premium gas bath for several days and before I installed the new parts I used tip cleaners (that welders use) and compressed air to make sure the carb veins were clear. I bought the repair manual and it says to set the float between 11.4 mm and 13.4 mm so I split the difference and set it at 12mm. It also has an adjustable jet needle and I put the clip on the middle notch, the same as where the old one was.
I have now put it back together and it still does the same thing. Do you guys have any ideas on what else to look at?
#2
Sounds like you just need to get your carb tuned correctly.
i realize this is for a different machine and carb, but the principles should be the same: Carb Tuning - Suzuki LT230S Vault
It helped me alot with my little quadsport, and i will use it as a reference when i restore my 350 Moto4 as well
i realize this is for a different machine and carb, but the principles should be the same: Carb Tuning - Suzuki LT230S Vault
It helped me alot with my little quadsport, and i will use it as a reference when i restore my 350 Moto4 as well
#3
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