RoderickYammins
CB750 New member
Greetings,
I've just purchased a CB750 with 16k miles. Previous owner chopped it up quite a bit, but I'm going to try to get her running right.
So, What's Going On?
Well, when I bought this bike, it sounded fine, all headers were blazing hot, and we hauled it back. The gave me a baffler to put on, which I did, and next time I started it I took it out for a ride and it was excellent, very powerful and smooth. I come back and now I notice cylinder 2's header is not quite hot, and the engine is making a knocking sort of sound.
I take the nasty carbs apart and find it's got two different sized main jets. Two carbs have 68, the other 2 have 74. All four have 112 secondary lmao.
Currently awaiting rebuild kit and new jets. Spark plugs were all black as well.
My question is what could have caused such a quick change? And, if the rebuild does not provide respite, would the next best thing be to check for compression?
I have a video of the sound. I can upload it if it would help.
I've just purchased a CB750 with 16k miles. Previous owner chopped it up quite a bit, but I'm going to try to get her running right.
So, What's Going On?
Well, when I bought this bike, it sounded fine, all headers were blazing hot, and we hauled it back. The gave me a baffler to put on, which I did, and next time I started it I took it out for a ride and it was excellent, very powerful and smooth. I come back and now I notice cylinder 2's header is not quite hot, and the engine is making a knocking sort of sound.
I take the nasty carbs apart and find it's got two different sized main jets. Two carbs have 68, the other 2 have 74. All four have 112 secondary lmao.
Currently awaiting rebuild kit and new jets. Spark plugs were all black as well.
My question is what could have caused such a quick change? And, if the rebuild does not provide respite, would the next best thing be to check for compression?
I have a video of the sound. I can upload it if it would help.