- Location
- Pismo Beach, Ca
So I bought a 92 stock superjet 650 and took it out to the lake a total of 4 times (on 40:1 mixture with MasterPro oil) and it ran awesome. Then I decided to run 50:1 because my friend was running that on his 550, and I used Valvoline oil because thats all Autozone had. Well after switching ratios and oil I went to the lake; the first half hour to hour it ran just like it always did but then after that it started to bog a little bit and miss on full throttle acceleration, kind of like it was running out of gas. I let the engine cool down but that didn't seem to help anything.
I figured one of the plugs went bad on it so I read the note on my exhaust that said NGK B8HS so I got those spark plugs. When I changed them out I realized that the previous owner was running on BR9ES spark plugs. But the recommended plug for a superjet is the B8HS so I put those in and tried to fire it up. It fired up for a second then shut off and wouldn't start back up on those plugs. I Put the BR9ES plugs back in and it started.
I know the obvious thing would to be go get more BR9ES plugs and run them but the superjet is all stock and I read old threads on here saying it can do sever damage to run those plugs on a stock head/stock superjet. So I don't know what to do, maybe its not my plugs?
I figured one of the plugs went bad on it so I read the note on my exhaust that said NGK B8HS so I got those spark plugs. When I changed them out I realized that the previous owner was running on BR9ES spark plugs. But the recommended plug for a superjet is the B8HS so I put those in and tried to fire it up. It fired up for a second then shut off and wouldn't start back up on those plugs. I Put the BR9ES plugs back in and it started.
I know the obvious thing would to be go get more BR9ES plugs and run them but the superjet is all stock and I read old threads on here saying it can do sever damage to run those plugs on a stock head/stock superjet. So I don't know what to do, maybe its not my plugs?
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