From:Martin Electronic:joker2 -A- midrivers.com
Subject:RE: RE: 48s going better & better Date:Tue Jun 16 01:50:55 2009
Response to:12619
I.M.O and someone else may respond and correct Me if I am wrong.
When running at W.O.T{Wide open throttle} and when you roll back on the throttle,if the bike seems to pick up and or seem to gain some speed then Your main jet is too small,be very careful as You will most certainley burn a hole in a piston.
I would do some research and see if You can get some larger jets for Your carbuerator and then see how it performs.
Pull a spark plug and see if it is extremely clean,if it is then I would not run this engine until You get the lean burn condition resolved or get the proper carb.which jets are available for.
Contact Mutt,He may possibly have a restored carb for Your machine.

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On my 1953 165cc, I've also experienced the engine bogging down on hills are against the wind at full or nearly full throttle opening. As in your case, by rolling off some of the throttle opening I feel the engine immediately pulling better.

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My newly running 48 is going (relitivily) well. I've problems getting as much umph as I remember from my other type S(s). I was 40 LB lighter & was not experienced with any more powerful bikes.

My bike seems to lose pull if I throttle over the revs it has, but if I back the throttle to the revs the motor has it pulls better.

The hard part is I don't have a L&L carb but the carb from a Leggaro, a Del lorto 18mm throat

Am I correct in assuming that the motor needs a little resistance to mix the fuel correctly?

Do I need to adjust fuel/air mix?

Does anyone know the Leggaro's carb well enough to help me?