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With stock carbs, air filter and exhaust the stock oem jets work well. If not, the carbs likely need a good cleaning, or air filter, or exhaust leaks. Be suspicious of aftermarket jets, quality/accuracy varies too much. Is there more back story related to your question?
 
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original jets dont wear out. If you are changing your exhaust and/or air filter you may need to rejet. 90/120 is the "starting point" but you will need to play round with sizes to suit your individual situation , altitude etc. Mostly ,stock jetting takes some beating - CV carbs are pretty forgiving
 

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Discussion Starter · #4 ·
original jets dont wear out. If you are changing your exhaust and/or air filter you may need to rejet. 90/120 is the "starting point" but you will need to play round with sizes to suit your individual situation , altitude etc. Mostly ,stock jetting takes some beating - CV carbs are pretty forgiving
Brilliant, thank you.
 
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