High rev

Discussion in 'General Support' started by TrynaLearn, Apr 9, 2019.

  1. TrynaLearn

    TrynaLearn Member

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    Hey guys the old blasty was running great then all of the sudden she started run with a high rev outta nowhere what could be the problem. Fires first kick runs great what could be causing this
     
  2. TrynaLearn

    TrynaLearn Member

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    Has keihin pwk 28 on it direct clamp on filter tors delete and premix. Like I said ran fine for about a hour then all the sudden seemed to be revving higher at idle
     
  3. chee_dee

    chee_dee Member

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    Might be worth mentioning that my Blasters did that as well, till I learnt that as fuel runs out (While PETCOCK is ON), the fuel supply to carb gets airbubbles and the revs starts running away. Now that I know that, soon as it starts to rev a lil higher I immediately know fuel running low, switch to reserve.
     
  4. Larry's Shee

    Larry's Shee Active Member

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    While chee-dee has a point, the most common cause is an air leak.
    The newest Blaster is 13yrs old. The old man is 30yrs old. Nothing lasts for ever. Most common problem is crank seals.
    Do a leak down test.
     

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