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Thread: sr50 70 kit running hot

  1. #1
    apriliaforum newb
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    sr50 70 kit running hot

    techno gas exhaust not sure what model
    Piaggio NRG 50 Power DT AC 07-09 17.5mm Carburettor with Auto Choke
    70cc cast iron cylinder kit from Naraku for Piaggio

    put a 96 jet in carb and not boging now starts rides ok 1/2 turns on air screw needle in midle position plug brown but seems hot, exhaust muffler to hot to touch is this normal as not run in yet tried a 103 jet but starts and cuts out .

    6.3 gram rollers red spring thinks may need lighter rollers and blue spring after tuning

  2. #2
    apriliaforum newb
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    Open filter on that carb will cost you power. Figure out what exhaust you have and filter and if the carb needle is the stock A22. Because it sounds opened up and not able to spin stock rollers? So it is not tuned yet. The airscrew helps you find problems yes but it must be around 1.5t to function correctly

    Tecnigas Next-R looks like this exhaust

    Have standard filter and stock needle pulling ok with rollers in hills etc but seems slower than my derestricted lionovince exhaust sr50 ditech

  3. #3
    apriliaforum Member rank1's Avatar
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    If the plug seems hot then try colder one.But rejet the carb for sure.

  4. #4
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    re jetted to a 100 but still running hot wondering if cramk seals are ok but pison i took out was ok there was a restricter brass ring in other carb wich i have left out of new carb

  5. #5
    apriliaforum Member rank1's Avatar
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    coolant bleed it properly?turn on the engine let it idle and use break cleaner around intake,cyl.about seals u should check both sides.the most of the time crank seals on the ignition side worn out.just buy a new one and replace it.do u premix?dont mix too much oil cuz it ll run leaner.

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