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1986 sporty rebuild

  • beaglebasher
    beaglebasher
    4 years ago
    Me old mate is trying to build  his bike.  
    Its  got the 1100 motor but hasn't been started for 14 years.. He got it running the other day but it was blowing flames out the front cylinder.  I was wondering if there is a cheap option to replace the barrels ,pistons and heads or would it be cheaper to get them machined with oversize pistons? 
    I would reckon you could buy a kit of some sort but would like to hear some suggestions from the forum. 
    Cheers 



  • fatbat
    fatbat
    4 years ago
    What year and model is your mate’s flame throwing sporty? Be good to see a photo too, BB. Of the bike that is, not your mate. Bonus points if you can get a pic of it shooting flames out
  • beaglebasher
    beaglebasher
    4 years ago
    Dont know the details mate but I managed to talk him into joining the forum.
    I will let him know I have started a thread.
  • Far Canal
    Far Canal
    4 years ago
    He may not need to replace barrels, pistons and heads. A compression test is a good start.
    Shooting flames sounds like a fuel issue.
  • beaglebasher
    beaglebasher
    4 years ago
    As I said FC i dont really know any details. I would have thought the shooting flames thing would have been a sticky exhaust valve but thats just a guess too. Hopefully he will give us all the details where he is at with it.
  • brucefxdl
    brucefxdl
    4 years ago
    BB, does the engine have any exhaust fitted,even header pipes ?
  • beaglebasher
    beaglebasher
    4 years ago
    I should have said the flames were blowing out the exhaust from the front cylinder.   I  have not saw it happening.
    From memory they were straight through pipes but I  dont  remember all the details.
    He has recently resurrected an old  1950 ish   AJS  
    That runs like a hairy old goat too.
  • brucefxdl
    brucefxdl
    4 years ago
    Quoting beaglebasher on 19 Aug 2020 10:20 AM

    I should have said the flames were blowing out the exhaust from the front cylinder.   I  have not saw it happening.

    From memory they were straight through pipes but I  dont  remember all the details.
    He has recently resurrected an old  1950 ish   AJS  
    That runs like a hairy old goat too.

    ok..just thinking,with no pipes ,usually a few flames and stuff after a first start from a long standing time.could possibly be a shitty exhaust valve seat if that cylinder was left on exhaust stroke at the last run,but who would no,as suggested may be state of tune,also from long standing time,shit in jets ect.good luck on sorting the issue and getting the build going.
  • daddyracer56
    daddyracer56
    4 years ago
    do a comp test , clean fuel system proper inc idle and main jets carb fuel delivery etc, check ign system 1st ,first things first  cheers bob
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