Engine trouble

Discussion in 'Announcements, Rules and FAQS' started by Gagesblaster, Feb 15, 2020.

  1. Gagesblaster

    Gagesblaster New Member

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    Just picked up another blaster...not sure the year....only thing wrong was the rings destroyed the piston....dude said it was bored over....i didnt have a micrometer to find out size so i ordered a stock piston because i had a stock top....bike fires right up idles good....but its sputters until i get the rpms up....cannot figure it out
     
  2. Awk08

    Awk08 Administrator Staff Member Technician

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    whats the compression of this new top end ?
    did you do the heat cycles then re-torque the head/base bolts ?
    check for airleaks with a leakdown test, as all new build should be
    clean the carb ?
    just for starters
     
  3. Slydog

    Slydog Member

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    What was the numbers on top of old piston
    ? Ussualy will have piston size engraved on top. (66.00) example for stock bore piston
     
  4. Gagesblaster

    Gagesblaster New Member

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    573m06675 was old piston numbers
     
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  5. Gagesblaster

    Gagesblaster New Member

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    My buddy let me borrow one of the gauges to check it....took it for an actual ride today and retightened once i got home and ive cleaned carb....looks brand new....once u get the rpms up it runs like a beast....but 5th and 6th gear doesnt run the best
     
  6. Slydog

    Slydog Member

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    So bore is 66.75mm. Last 4 digits is piston size ussualy on these pistons.what size did you put in?
     
    Last edited: Feb 16, 2020
  7. Slydog

    Slydog Member

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    What were the jet numbers in carb?
     
  8. Slydog

    Slydog Member

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    Also check air cleaner. Float height could be off.do plug chops to confirm jetting is very important.so this piston doesn't fry!!what carb is on it.is it the stock carb?
     
  9. Gagesblaster

    Gagesblaster New Member

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    Stock size because i had a couple stock jugs...and its a stock carb needle and jets...i took insides of of my other blasters carb
     
  10. Slydog

    Slydog Member

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    What's the numbers on the jets.leakdown test?as mentioned earlier.there is usually a reason That piston looked like it did.what clip position is needle on in carb. Usually middle position works on most stock carbs
     

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