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Easy Rotax Won't Rev Out

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I'm looking at a Keihin carbed, Rotax engine Easy for a mate, Ive got it started and running and fixed a number of other problems, it has been stood for the last 10 years but is in remarkably good condition.

The bike is rideable at low revs but as soon as you open it up it just will not rev, Ive cleaned out the carbs and changed the plug, compression is okay and getting better the more it is run, its sounds lean, not boggy to me, any ideas ?  Ignition timing perhaps??

  • Author
On 6/26/2019 at 6:41 PM, b40rt said:

What carb ? Sounds typical of an air screw Dellorto ?

"I'm looking at a Keihin carbed....."

  • Author
On 6/26/2019 at 4:58 PM, lineaway said:

Check to see if you have fuel in the float bowl.

It does sound lean but not fuel starved, i think your suggesting float height issues??

Since it seems in good shape look to things that would cause poor fuel flow from sitting.  The three that come to mind are: clogged carb vent; crap in the petcock; crap in the tank filter that leads to the petcock.

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