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How to tell apart GS 400, 425 and 450 Head

  • Thread starter Thread starter BrianH
  • Start date Start date
B

BrianH

Guest
I've got a GS 425 1979. I can't tell if the head is from a 450, or 425.

The reason I think it may be a 450 head is because the cams say "450" on them. Also the head has no screws next to the spark plugs that screw into the cylinder base. The clymers manual specifies that GS425's should have these screws.

This is proving to be a problem because I cant set the timing properly without knowing what type of head it is.

If it is in fact a GS450 head can it be timed correctly for the 425 cylinder?

Thanks
Brian
 
The 400/425 head will have a idler sprocket between the cams. The 450 head does not have an idler.
 
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