Z155 Build Help

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Z155 Build Help

This is a discussion on Z155 Build Help within the Chinese/Import Minis - General Discussion forums, part of the General Talk category; Hi guys, I have a Z155 that I am in the process of building. I ordered a yx170 head from pitster as its a cheap ...

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Thread: Z155 Build Help

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    lilminis's Avatar

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    Z155 Build Help

    Hi guys, I have a Z155 that I am in the process of building. I ordered a yx170 head from pitster as its a cheap alternative to the v2. Problem I'm having is with the timing g chain. I purchased a new timing chain 45 link and it's too long. The stock chain is also too long. The cam gear is 32t and the crank gear is 15t. Anybody have any info on this ?

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    dirtbkr188's Avatar
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    HERE is a parts diagram for the Z155 engine, it shows a 90 link cam chain and a 32T cam sprocket. It does not specify the number of teeth on the crank sprocket, but it should be 16T.
    All things being equal not sure why the chains you have are too long, other than the YX170 head not being as tall as the stock head...
    - dirtbkr188 -



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    I'll try to take pictures tomorrow. Every one I taliked to said it should be a direct bolt on.

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    how does a yx170 head and v2 head compared in performance gain? I couldn't seem to find the part on pitster pro website, can you share a link please?

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    The yx170 head takes takegawa rockers, but the bearing is different sized on the cam so it's not interchangable. I guess the stock cam is kinda crappy. I had to call to order the head. I don't think they have any more

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