Cam degreeing

S

silverbullet132

Well-known member
Anyone know where I can get it done for a reasonable cost? On a 78 gs750, yosh cams.
 
Since you are in Mississauga, try Pro 6 Cycle or Rider's Choice.

If the sprockets have to be modified by machining slots, there's going to be a cost over and above just doing the adjustment ...
 
I think the Yoshi cam kits come with sprockets, OP should be okay there.

Gord's quote was basically for 4 hours of work which seems reasonable. You've got to set up your dial indicators, your timing wheel, find TDC, mess with the sprockets and then check/adjust valve last once everything is done. It'd take me all day lol.

There might be other people with a lower hourly rate but I wouldn't want someone to rush a job like timing cams.

Also, are your cams just a different profile or are they higher lift? If it's the latter make sure you don't need new stronger retainers and springs.
 
sixstring said:
I think the Yoshi cam kits come with sprockets, OP should be okay there.

Gord's quote was basically for 4 hours of work which seems reasonable. You've got to set up your dial indicators, your timing wheel, find TDC, mess with the sprockets and then check/adjust valve last once everything is done. It'd take me all day lol.

There might be other people with a lower hourly rate but I wouldn't want someone to rush a job like timing cams.

Also, are your cams just a different profile or are they higher lift? If it's the latter make sure you don't need new stronger retainers and springs.
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Guess I have to call yosh to find out, got them used. Came with an entire engine for $220.
 
Definitely give yoshimura a call if you don't have info on the cams. Even if you were to get someone like Gord or Pro6 to time them, they'd still need to know the amount of lift, duration etc. Yoshi will also have some recommended timings.
 
sixstring said:
Gord's quote was basically for 4 hours of work which seems reasonable. You've got to set up your dial indicators, your timing wheel, find TDC, mess with the sprockets and then check/adjust valve last once everything is done. It'd take me all day lol.
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This. Anything like this, grinding or crank balancing etc... I'd be happy to pay experienced shop rates.
 
Just spoke to yosh...they had two spec sheets taped to the side of a filing cabinet in the back of the warehouse. Got lucky there.

Was told aside from that there is 0 information available due to the cams being so old, and POPY vs Yoshimura. Will post the spec sheets when I get them in my email for future searchers.

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Find out what the OEM's lift and duration numbers are. Will help a long way to towards getting a decent base jetting.

Try posting these cams on some gs rider forum. There's lots of cult bikes that are no longer supported by factories but still have tonnes of support from owner's clubs. My ZX-7 is a good example.

Also, check to see if there's a procedure for checking wear on those cam journals (plasti gague maybe? i dunno).... if they're out of spec, it might be a good idea to steer clear of these cams altogether. Try to download a shop manual for all this info.
 
I can see from the pictures that the cam sprockets are already slotted. Someone, at some point, must have set up the cam timing in order to put them in the correct position in the slots.
 
sixstring said:
Find out what the OEM's lift and duration numbers are. Will help a long way to towards getting a decent base jetting.

Try posting these cams on some gs rider forum. There's lots of cult bikes that are no longer supported by factories but still have tonnes of support from owner's clubs. My ZX-7 is a good example.

Also, check to see if there's a procedure for checking wear on those cam journals (plasti gague maybe? i dunno).... if they're out of spec, it might be a good idea to steer clear of these cams altogether. Try to download a shop manual for all this info.
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Ah ok, will look around. Hopefully I can find that info.

Brian P said:
I can see from the pictures that the cam sprockets are already slotted. Someone, at some point, must have set up the cam timing in order to put them in the correct position in the slots.
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Ah ok, so that should save some time during setup?
 
I dunno if I'd trust the previous owner's timing. I mean the motor blew up after all right? I'm assuming a $220 engine was blown or seized or something. Even if you don't move the gears around, I'd at least check the timing.
 
sixstring said:
I dunno if I'd trust the previous owner's timing. I mean the motor blew up after all right? I'm assuming a $220 engine was blown or seized or something. Even if you don't move the gears around, I'd at least check the timing.
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Alright.

Two of the pistons went bad in it he said (yosh 850 kit) so thats why he stopped using it. Said he took the two good ones and left the bad ones on the con rods lol. They are still there.
 
I am only using the cams but good idea. Will bring em by a shop when I get a chance.
 
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