WOT for 600 ft and motor starves or dies for some reason.

[Simonsr50]

My buddy has an 01 elite sr50 that he just installed a 72cc polini corsa in. Before that and now it seems like if you hold WOT for any long period of time is dies or starves for gas. We have a 102.5 main in it and the plugs looks mint. Anyone have any similar issues? Could it be electrical or maybe something with fuel delivery? Any help is much appreciated.

[veedubh20]

sound like foul plug , bad cdi, possible new bore not break in properly..

leaking gaskets, crank seals. wrong premix ratio..


do you follow the instruction careful on breakin bore kit on polini?

plug look mint ? what do you mean? what color is plug tip end?

is the fuel hose get gas into a carb, by kickstart crank?
bad fuel petcock/clog filter.

dont go wot open on the new bore kits, too many people dont folow instruction break in the bore kit.

[Simonsr50]

With stock carb, pipe and carbon reeds, what's a safe main jet size? Also with the 72cc kit do we need to change the pilot? If so how big? Oh and how much oil should he run in his gas tank in addition to his oil pump?

[veedubh20]

must runs same oil on oil tank and gas tank. 4oz to a gallon. for every .250 meter pump is 1 oz oil.

.250 - 1oz oil
.500 - 2oz oil
.750 - 3 oz oil.

the pa carb dont have a pilot jet size. main jet can be change.

or need to get a 18mm mukuni vm carb ca use stock airbox. with stock sr muffler.

gear need to change 8:1- 8.4 from stock gear 12:1

add malossi spring saver on center spring. . DOnt need to buy after market center spring. clutch shoes springs.

need to get keli pulley and ramp plate. use honda stock belt. and leave honda tranny.

[Tate]

Take the gas cap off and try it.

Sometimes the little vent holes in the gas caps get obstructed.

Its a long shot but an easy one.

[Bear45-70]

must runs same oil on oil tank and gas tank. 4oz to a gallon. for every .250 meter pump is 1 oz oil..................

Explain why you can't mix oils? If what you claim is true, why are blended oils so popular today?

[veedubh20]

2 stroke oil brand has different thick and thin, will affect the jetting tunning.

[Bear45-70]

2 stroke oil brand has different thick and thin, will affect the jetting tunning.

So what? The pump needs a different type of oil than the tank does. If you consistently use the same oils all the time while jetting the different oils will effect NOTHING.