Question:
I removed the engine and heads from my bike, how can I tell if I have the timing 360 out of time. I am getting sparc fuel and it has compression in both cylinders. It is a v-twin DOHC engine. there are no bent valves and it will not start. My only anwser is that is 360 out of time (plugs fireing when not on compression stroke)
I am out of answers
Answers:
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Hey, this is a very difficult bike to time! It's more then possible you have one more cams out of time. If one cylinder is timed correctly then that should fire and should even run. Other suspects would be the carbs. Make sure they are seated in the manifolds and the choke cable and linkage is hooked up properly. This is an easy place to mess up and I've seen it before.If your cam timing is off then you may have bent one or more valves. You probably will still have compression. Is your compression what it's supposed to be? You need to test this with a gauge. The only way to see if a valve isn't bent is with a leakdown test or to pull the valves and measure them. (You may see an impact in the carbon on top of the piston, but if you removed the carbon then you may not see it.) Here is a trick that might help you. I know you can't do anything on this motor with it in the frame. You may be able to check the timing by pulling the cover bolts and using a wooden wedge to hold up the covers. I have replaced both cover gaskets without pulling the motor so I'm thinking you may have just enough space to see the marks.
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Make sure you have a factory manual. Also ask for any bulletin updates. I seem to remember either a bulletin or video being sent out for working on this motor.
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remove the plug from No 1 cylinder. turn over bike & watch the valves..exaughst closes...inlet opens..piston going down..inlet closes piston comes up...when its at TDC...the plug should spark...
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That's most likely the problem. I suggest you check the cam timing again to make sure it's correct.Don't penny pinch. Buy a manual.
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You mean 180 out, 360 is a full circle and will be back where it should be.If you have good compression the timing should be OK.
When it cranks it is at normal speed and the batt is fully charged.
A low batt will not give you a good spark.
What was the reason you had to remove the motor?
Do you know about VN750.com Great info and people to help there.
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