Cam timing....when triple checking isn't enough.

Technical information and Q&A applicable to all years and models of Goldwings
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Cam timing....when triple checking isn't enough.

Postby SteveB123 » Thu May 03, 2012 7:23 am

Recently changed the belts and rebuilt the idler bearings on my new-to-me 81 Interstate, and managed to get it started....boy did it sound like crap.....too far off for just a bad carb sync, the whole rhythm of the engine was I recall reading either here or on NGW about really getting your face down directly in front of the timing gears to check the alignement of the gear marks.....sure wish I had the first, second or third time I checked them before I buttoned everything up. To me, (obviously, on an angle) they looked like they were 1/2 a tooth off, but what could I do about a half a tooth?


Well, THAT'S more like it.


Quite obvious now that it was a tooth off.....but before i took the pic, I must have been looking at it on an angle, and it looked ok!

After....THAT'S more like it!

Get your face right in front of them, or take a pic with the camera DIRECTLY in front of the cam marks.

Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

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Re: Cam timing....when triple checking isn't enough.

Postby virgilmobile » Thu May 03, 2012 7:31 am

Amazing how the eye can deceive. :shock:
This is really a thing good to look at.
I do know a wing will run,although poorly,with one tooth off.Been there too.
I guess it's all in the details.
Good catch and a great job too. :D

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Re: Cam timing....when triple checking isn't enough.

Postby WingAdmin » Thu May 03, 2012 8:42 am

Yeah, the parallax between the pulley marks and the case marks can cause exactly that problem. Even more so on the engine crank, where there is more distance between the marks. You really need to get your head right down there even with the marks.

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