Zirri 135 engine

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    rhyshill1

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    Zirri 135 engine

    Post by rhyshill1 on Fri Jun 15, 2012 5:22 am

    Now that my smallframe has few jobs left until it's complete, i can now get started on my 135 engine. I've got an old school zirri barrel, head and piston (marked zeta) Been told that these markings are from the company that orginally produced them? I will be cutting a pk 125 crank, I don't know if the conrod will be strong enough though (any advice will be nice) I've got pk 125 casings to play with. I've got to work out what internals to use yet. I'm not aiming for maximum power, i want it to be able to accelerate well, pull well and sit at a comfertable speed with no problems. I will get pictures of my casings, kit and crank in the next few days. Aswell as any new parts i buy Smile
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    ttscshaggy

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    Re: Zirri 135 engine

    Post by ttscshaggy on Fri Jun 15, 2012 5:45 am

    Cool stuff Rhys
    I'll advise where I can Wink
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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Fri Jun 15, 2012 5:47 am

    Cheers mate. I just want to take it slow and do it as best as i can. I will only be able to buy parts here and there, moneys abit short Sad
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    ttscshaggy

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    Re: Zirri 135 engine

    Post by ttscshaggy on Fri Jun 15, 2012 5:49 am

    true dat mate
    best to build it slow and get everything spot on anyhow dude

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    NorthernJordan
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    Re: Zirri 135 engine

    Post by NorthernJordan on Fri Jun 15, 2012 5:51 am

    Sounds interesting Cool


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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Fri Jun 15, 2012 5:58 am

    Yeah, thats the plan anyway Wink And, i dont personally know anyone with a zirri engine so it's abit differant to me
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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Fri Jun 15, 2012 6:04 am

    I'm not looking to open my ports out too much either, just gunna match them all up and clean them all up and see how it runs like that for a bit
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    Wally
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    Re: Zirri 135 engine

    Post by Wally on Fri Jun 15, 2012 6:46 am

    Sounds fun. Keep us updated Wink


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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Fri Jun 15, 2012 9:07 pm

    Will do Smile
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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Fri Jun 15, 2012 9:08 pm

    Will that crank be okay do you reckon?
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    Skajosh

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    Re: Zirri 135 engine

    Post by Skajosh on Sat Jun 16, 2012 12:19 am

    If your cutting the crank it sometimes has the same principles as a performance crank.
    I think shag cuts all his cranks that he used and doesn't use a performance one.
    If you're on a budget a standard pk125 crank is fine to use, just make sure you get the large taper flywheel.
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    ttscshaggy

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    Re: Zirri 135 engine

    Post by ttscshaggy on Sat Jun 16, 2012 12:41 am

    the Pk crank is 20/20 size which is good
    with Pk 12v ignition try and source a pk50 flywheel as these are pretty light..Around about 1.6kg
    Genuine cranks beat the likes of mazz cranks, they only have a little more cut off the rotary web and the pin tolerances aren't as tight as genuine piaggio stuff.

    The best thing for cutting a crank is to have it split. But If you dont want to do that rap a rag around the bigend tightly a seal it so no swarf can get in when cutting it.
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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Sat Jun 16, 2012 1:12 am

    Okay nice one. Ill see if my dad can get it split and try it that way, if not i'll do the old rag thing. When I finish work, I'll try get some pictures up of what i have so far Smile
    Cheers
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    NorthernJordan
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    Re: Zirri 135 engine

    Post by NorthernJordan on Sat Jun 16, 2012 4:09 am

    I'm surprised shaggy didn't recommend one of those ETS cranks from stoffi.


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    Re: Zirri 135 engine

    Post by ttscshaggy on Sat Jun 16, 2012 5:32 am

    good shout Jordan, I'd forgot about that.
    Ive one here waiting to go into a customer engine.

    Standard Ets crank has more web cutout as standard, also the bonus of bigger seal and bearing diameter. You have to have a conversion bearing to fit into Pk/Vrange cases tho, I think this usually comes in a 2 part affair which is a bit shit..Always go for a one piece bearing for lateral load
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    Re: Zirri 135 engine

    Post by NorthernJordan on Sat Jun 16, 2012 5:34 am

    I'm surprised I actually said somethi g right about small frames!


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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Sat Jun 16, 2012 8:33 am

    So these are a few pics of my top end so far!





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    ttscshaggy

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    Re: Zirri 135 engine

    Post by ttscshaggy on Sat Jun 16, 2012 10:03 am

    It would be worth smoothing off the casting marks in the head chamber with emery paper Wink
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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Sat Jun 16, 2012 7:07 pm

    Yeah, was gunna do that today :p
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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Sat Jun 16, 2012 10:16 pm

    Okay, so in the next few days i will be starting to mark out and cut the third transfer port into my casings, i'll have pictures of befores and after and all the marking out i do so you can all approve Smile
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    ttscshaggy

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    Re: Zirri 135 engine

    Post by ttscshaggy on Sun Jun 17, 2012 1:01 am

    cutting that third transfer into the casing can be a tad tricky. Dont go deep ! you will very quickly open up the hole for the casing bolt. you want a nice fairly shallow angle.
    tbh, there isnt a lot of benefit from this as there isnt a direct feed from the intake tract.
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    rhyshill1

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    Re: Zirri 135 engine

    Post by rhyshill1 on Sun Jun 17, 2012 5:41 am

    Yeah, i was never gunna take it down too far. I've got my dad to help me too Wink

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