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 Post subject: Blade 150DX - Cam / Timing Chain Install
PostPosted: Mon Mar 24, 2014 9:02 pm 
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Okay I need some help here.
It's been way too long since I've done any work on a GY6 involving the cam and timing chain install.

A little background:
This was Hoopster's buggy. I gave the buggy to my brother in KC so his kids could use it. We rode at the 2012 Bash and shortly after he got it home one of the valves on the 4-valve head chipped.

With the help of Tom Syc I was able to get another valve for it. I was recently back in KC and attempted to put the buggy back together.

I'm able to get the timing chain on the cam; but it doesn't line up as close as I'd like to.

What I do is:
Put the piston at TDC.
I then start the timing chain onto the cam gear;
Then start rotating the engine over to get the chain onto the Cam Gear; holding down the cam in place while continuing to rotate it over.

The hard part for me is I don't have a mark that I can get the chain lined up on the cam gear such that I know for a fact that it's lined up correctly when the chain is fully on the gear.

I can't find the original marks on the chain nor on the Cam Gear.
I've tried to mark the chain at it's centerpoint that corresponds to the piston TDC and place a corresponding mark on the Cam Gear. However, it always seems to be 1 or 2 teeth off when it's finally on.

One time I'll be 1 tooth short on the leading edge; I move it over 1 tooth and then the next time I'm off 2 teeth on the trailing edge.

So my question for you guys (I was tired and should have looked at it while i was there);

Is there a master link on the timing chain?
-or-
Is there another way to get it on there?

I appreciate the help guys.

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Chris Dierkens
'09 Polaris RZR: AAEN MPP Muffler, S-Cage, Mudlites, Bumpers, +5 LT
'04 Yerf-Dog 3206: Moded (SOLD)
'05 Blade 150 DX: Moded (Hopster RIP) @ Brother's
http://www.northeastbuggy.com
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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Mon Mar 24, 2014 9:14 pm 
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I have to ask. did you remove the cam chain tensioner?

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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Mon Mar 24, 2014 9:24 pm 
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Chris, if the head has been milled it will have the cam retarded some. Or if the chain is stretched it will do the same.

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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Mon Mar 24, 2014 10:03 pm 
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I just finished replacing my timing chain on my hh 250. But yea if it doesnt line up perfectly and it has jumped time then you will want a new timing chain.

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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Mon Mar 24, 2014 11:30 pm 
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If the timing chain falls off the crank sprocket. you may not notice it riding off to one side. There will be no way to keep the cam in time this way and will drive you crazy trying.

Once you verify the chain is on the lower sprocket, get the piston at TDC. With the tensioner removed, you should be able slip the chain over the cam sprocket and loosely tighten it down along with the tensioner to verify timing. As was already posted, you may not be exact on the lines with a milled head. Once you get it as close as you can, tighten the cam and tensioner down then cycle the engine a couple times and verify timing at TDC before buttoning up the rest.

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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Tue Mar 25, 2014 7:20 am 
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Okay guys I think I have a good idea on how to proceed.

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Chris Dierkens
'09 Polaris RZR: AAEN MPP Muffler, S-Cage, Mudlites, Bumpers, +5 LT
'04 Yerf-Dog 3206: Moded (SOLD)
'05 Blade 150 DX: Moded (Hopster RIP) @ Brother's
http://www.northeastbuggy.com
National Bash 2011-Site 106


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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Tue Mar 25, 2014 8:20 am 
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Chris there is no master link

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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Tue Mar 25, 2014 9:35 am 
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The GY6 never lines up exact (at least mine never has) I always tilt the cam slightly... with all the slack out of the side opposite the tensioner... put the chain on cam and put cam in place... (move 1 tooth forward or back until it is as close as possible) Then when cam tensioner is replaced it won't move off a tooth when the slack is out- Pat

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 Post subject: Re: Blade 150DX - Cam / Timing Chain Install
PostPosted: Tue Mar 25, 2014 10:02 am 
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Funnyman wrote:
Chris there is no master link

Thanks.
I didn't think there was but it's been so long I thought perhaps I had a chance.

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Chris Dierkens
'09 Polaris RZR: AAEN MPP Muffler, S-Cage, Mudlites, Bumpers, +5 LT
'04 Yerf-Dog 3206: Moded (SOLD)
'05 Blade 150 DX: Moded (Hopster RIP) @ Brother's
http://www.northeastbuggy.com
National Bash 2011-Site 106


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