Weird head I found on a blasty. Anyone know what it actually fits?

Discussion in 'Engine' started by Austin Chapman, Dec 27, 2019.

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  1. Austin Chapman

    Austin Chapman Member

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    Alright new guy here got a buddy into riding and decided his first quad to be a blasty. I also own one. Well the Chinese carb he ordered and didn't jet fried his top end. Which is what led me to this... Does any one know what kind of bike this came off of? I've searched the web and can't find a clue. The bike was running great with it on there though. (With my genuine carb jetted to the bike) 15775016793581665157582830991565.jpg

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  2. Larry's Shee

    Larry's Shee Active Member

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  3. Austin Chapman

    Austin Chapman Member

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    Yes. Everything fit perfectly. Ran the bike for awhile with it on there. Ran the same as a normal blaster head. And that's what I was thinking too. The cooling fins are taller than a blaster head. Maybe could have some increase in cooling.
     
  4. 79 bronco

    79 bronco Moderator & Self Custom Psycho Staff Member

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    I don"t know???????
  5. 79 bronco

    79 bronco Moderator & Self Custom Psycho Staff Member

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    I don"t know???????
    There are a lot of heads that will fit. It looks like you got a old yz head?

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  6. Larry's Shee

    Larry's Shee Active Member

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  7. Slydog

    Slydog Member

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    Cleaner burn?
     
  8. Austin Chapman

    Austin Chapman Member

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    Thought it could be an old yz head but as larry pointed out it has the offsets combustion chamber. Now I'm curious as to if there is or could be any benefit gained from this head.
     
  9. Slydog

    Slydog Member

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    Look at the pics bronco put up.one of combustion chamber is offset.
     
  10. 79 bronco

    79 bronco Moderator & Self Custom Psycho Staff Member

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    I dont know anything about the offset. Never looked into it.
     
  11. 79 bronco

    79 bronco Moderator & Self Custom Psycho Staff Member

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    If it is a yz250 head then its cut for a 70mm piston, when a blaster is 66mm.
    Is the chamber in the yz head shallower then the blaster head?
     
  12. 79 bronco

    79 bronco Moderator & Self Custom Psycho Staff Member

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    Could be a it250 head. Some of them have 2 plug holes.

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  13. Austin Chapman

    Austin Chapman Member

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    Sorry for the delay... Been working and digging on this head. You guys helped alot. Still unsure what it actually is but we are close. It matches up perfect anyways I put it on my blaster for sh*ts and giggles, immediately had to drop the main from a 290 to a 260 with the needle raised one clip for a matching plug chop. After that it really ran the same, not a noticeable difference at all besides maybe a different power curve right on the pipe. Also noticed (this could be jetting) that there was more smoke out of the exhaust right off of idle, After that it's normal. Idk guys I'm stumped. I've measured this thing every way possible and it all matches up. I'm now curious to find the jug this belongs too and see what it has to offer. BTW my blaster is a 99 ported and Polished the jug myself per Ken's vids and a little extra I did my self, I'm running 1987 trx 250 ex shocks, weisco crank, and a namura Piston.
     
    Last edited: Jan 15, 2020
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  14. Slydog

    Slydog Member

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    Or have ken rechamber. A stock head.makes a difference
     

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