Question about Craftsman 675 Series 190cc 22" Briggs Stratton Rear Bag Front Propelled Lawn Mower ()

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Motor has to be cranked alot to start and then when you push up on the throttle for more power it runs just above an idle , and dosent rev up all the way

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Your carb. might be out of adjustment. There is a rod and another rod with a spring on it going from the carb. 2 an arm on the side of the motor. With the motor running, push the arm a little towards the carb. If it revs up, its out of adjustment, if not, you have a dirty or bad carb. Clean or replace the carb. If that doesn't work, your keyway might be cut or broke. The keyway is what keeps the motor in time so everything works together. Like a timing chain or belt on a car. Good luck.

Posted on Jul 10, 2010

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You mean the revs come up even if the throttle is left in idle?
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Hi and welcome to FixYa,

Appreciate the direct "Ask Me".

Initially, pls confirm that it uses a two-stroke 50CC engine. Additionally, your description "It refuses to rev beyond idle speeds." could indicate several conditions:
  • throttle up above idle speed, engine stalls/dies - fuel related issue, fuel starvation, clogged jets, nozzles, too much 2T oil, contaminated fuel (water). Basically a carb rebuilt;
  • throttle up above idle speed, no change in engine RPM - mechanical problem, possible broken accelerator/throttle cable, stuck plunger in carb, detached needle valve;
  • throttle up above idle speed, engine backfires/dies - electrical issue, check CDI, stators, trigger/pulse, their physical state/mounting, electrical connections;
  • throttle up above idle speed, engine hesitates/flat spot - air/vacuum issue, check rubber coupling from carb to intake manifold, blocked or absent air filter.
Good luck and Thank you for using FixYa.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

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