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Author Topic: Too Many Timing Marks  (Read 231 times)

Cloud

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Too Many Timing Marks
« on: February 09, 2018, 12:19:17 PM »


I've got custom camshafts and they're covered in various timing marks, arrows, chevrons, lines, letters...

What do the factory standard ones look like, which one specifically is the TDC timing mark, and where should they be at piston TDC?

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umop-ǝpisdn

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Re: Too Many Timing Marks
« Reply #1 on: February 10, 2018, 07:23:36 AM »

Dear flayer of bearings, crusher of washers and devourer of Yamahas,

Since when did you get a 250?

P.S. I was going to add "stopper only for kittens", but I wasn't sure if it was true.
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I used to be a sensitive, new age guy, but times have changed and now I am more of a caring, understanding, ninties type.

Cloud

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Re: Too Many Timing Marks
« Reply #2 on: February 10, 2018, 08:24:35 PM »


My 125 engine uses GV250 cam chains (wider than the 125 ones) and presumably GV250 camshaft sprockets. These are the ones with all the timing marks on. I doubt the 125 is much different but it seemed more appropriate to go up here.
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Hylife

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Re: Too Many Timing Marks
« Reply #3 on: March 09, 2018, 10:16:59 AM »

Camshaft timing is done at the F and R mark on the magneto, NOT the piston TDC.
The engine service manual has excellent resolution images of the cams and their markings.
Page 81 onwards..
http://files.hyosungmotorsusa.com/GT125_250_Service_Manual.pdf
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Cloud

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Re: Too Many Timing Marks
« Reply #4 on: March 09, 2018, 04:16:15 PM »


Thanks! I've got a 2 and a 3 on the sprockets!

I'm pretty sure that's where my guesswork put them anyway.
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