streetfighters
Forum Apprentice
So ya pull off the #4 plug lead and experience minor difference in idle. Plugs and wires/coils?
streetfighters
streetfighters
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mike_of_bbg
Guest
Unless the compression test was done hot and WOT, I wouldn't put much stake in the actual #'s.
If the crank is twisted between cylinders 3 and 4 you could show a low compression on 4 from it being out of phase, even if the rings and valves are OK. This should be easy enough to check: set the engine so cylinders 1 and 4 should be directly between TDC and BDC, remove the plugs, and use some sort of slender rod to measure the distance from the spark plug holes to the piston tops. They should be pretty much identical.
At TDC or BDC angular variations will result in little vertical movement. At mid-stroke is where you should see the most vertical difference from a twisted crank.
If the crank is twisted between cylinders 3 and 4 you could show a low compression on 4 from it being out of phase, even if the rings and valves are OK. This should be easy enough to check: set the engine so cylinders 1 and 4 should be directly between TDC and BDC, remove the plugs, and use some sort of slender rod to measure the distance from the spark plug holes to the piston tops. They should be pretty much identical.
At TDC or BDC angular variations will result in little vertical movement. At mid-stroke is where you should see the most vertical difference from a twisted crank.
S
suzi
Guest
Just wanted to let everyone who responded to my post that I have printed out all the advise, suggestions and comments that were made and have given to my mechanic.
Hopefully by putting all of our heads(your heads)together we can get this thing back to running how it should.
I very much appreciate all of your input, thoughts, advice and suggestions. If he still can't get it right guess I'll look for another mechanic, or MAYBE try and handle it myself.
Again, many thanks! will keep you posted
Hopefully by putting all of our heads(your heads)together we can get this thing back to running how it should.
I very much appreciate all of your input, thoughts, advice and suggestions. If he still can't get it right guess I'll look for another mechanic, or MAYBE try and handle it myself.
Again, many thanks! will keep you posted
B
BadBillyB
Guest
These old bikes are known for having vacuum leaks at the carb manifold boots. Usually cracked and leaking "O" rings between the head and manifolds. Spray carb cleaner around #4 while idling and see if you get a response......Billy
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suzi
Guest
Thanks for the tip Billy. I had just replaced all 4 boots and o rings with new set a few months ago. Those things were EXPENSIVE!!!
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