8nisd10a Posted July 11, 2019 Share Posted July 11, 2019 So it's a bit of a story what has happened I will try to summarise briefly. Grinding noise in engine, took it to a mechanic he told me the problem is in the bottom end. I stripped the engine down completely and put it back together, put it in the bike but it didn't run. Had a look at the cam gear and realised that somehow I had set the timing wrong (I don't know how I did this after putting the whole engine back together correctly!). The inlet pushrod bent and there was a black mark on the piston from the valve hitting it but the cam gear looks undamaged and crankshaft is still silky smooth. I did a compression test and found with a bit of oil the compression jumped from 110 to 125 so I changed the piston. Fired it up and it sounded good. Jumped on and rode it it around but as soon as I open it up at all it chokes. It doesn't stall but it won't produce any more power. It feels a lot like a problem I had doing high altitude driving and just like then the spark plug gets black very quickly. I have done everything I can think of to diagnose and fix it. Ran it without air filter in, cleaned the carb, put a new spark plug in, changed the fuel, adjusted the carb floats, changed the exhaust gasket, nothing makes a blind bit of difference, it just can't handle any kind of load on the engine. I will change the head gasket but I don't see how it could cause this problem. Any ideas? I'm really stuck as to what to do next but I love the bike Quote Link to comment Share on other sites More sharing options...
fastbob Posted July 11, 2019 Share Posted July 11, 2019 Exactly what air box and filter set up have you got ? Some pictures of this area with the seat off would be helpful . I have an idea what it could be but I'd like to see it first . Quote Link to comment Share on other sites More sharing options...
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