[ItsBrett_205]

Has anyone done this? Im thinking it would give me more snap. I need some tips. Thanks

 

[phatfiddy]

Don't drill the cam sprocket. However, you can elongate the holes on your ignition pickup to advance timing. This, along with flywheel lightening will give your bike more 'snap'.. Revs will climb quicker if you have about 8-9 oz. removed from your flywheel

 

[phatfiddy]

Pictures from 50cc MotoX --Dano's Bike Shop-- Honda, XR50, CRF50, Pitbike Information Source

 

[klx110greg]

well the guy i got my pitbike from which is a gpx 125 and he said he lighnted the cam and advanced timing and now it needs higher octane and i dont have it so idk how to run the bike it will sputter sometimes? ?anyhelp

 

[ItsBrett_205]

Don't drill the cam sprocket. However, you can elongate the holes on your ignition pickup to advance timing. This, along with flywheel lightening will give your bike more 'snap'.. Revs will climb quicker if you have about 8-9 oz. removed from your flywheel

Did you elongate in your pickup? If so can you elaborate?

 

[firepower354]

You're talking cam advancing, not ignition. Both can help bottom end, hurt top.

Rest of the combo?

 

[phatfiddy]

You're talking cam advancing, not ignition. Both can help bottom end, hurt top.

Rest of the combo?

Would you mess with the cam timing at all? Just didn't know if this is common practice.





Listen to Firepower he's the engine guru around here

 

[ItsBrett_205]

You're talking cam advancing, not ignition. Both can help bottom end, hurt top.

Rest of the combo?

Im running a 88 kit with a E22 head, and a 20mm carb. If thats what your asking. What do you think I should do?

 

[phatfiddy]

Ditch the e22 and get a new trailbikes race head.. Lots of bang for your buck and it's and easy bolt on.. Jmo

 

[geezer]

If youre running a stock cam its a waist of time.Send out the head for porting to someone that knows what thier doing and get a bigger cam and springs. Or just buy a 140 and be done with it.

 

[ItsBrett_205]

Ditch the e22 and get a new trailbikes race head.. Lots of bang for your buck and it's and easy bolt on.. Jmo

it was free.

 

[ItsBrett_205]

If youre running a stock cam its a waist of time.Send out the head for porting to someone that knows what thier doing and get a bigger cam and springs. Or just buy a 140 and be done with it.

Im building a stocker.

 

[geezer]

It thought a stocker meant leaving it stock. If you want to go faster, it aint stock no more. The E22 head is ok but much better ported with a bigger cam. Advancing the cam aint going to do much of anything.

 

[ItsBrett_205]

Well Im going to race it in the stock class. They wont let the big china motors but they dont mind the 88's.

 

[geezer]

I understand what youre saying, Im saying youre next step is headwork. If the E22 is done rite,it will be much faster.

 

[firepower354]

Im running a 88 kit with a E22 head, and a 20mm carb. If thats what your asking. What do you think I should do?

Porting the head and manifold(pref the Tak long & low job), and stiffer valve springs will give a good all-around torque curve. Make sure you've got a tight piston to head clearance, .030" or so. A cam is OK, if you have a closer ratio trans, but the stock 5.25/5.5mm one is pretty nice overall. Add a YX 160-type outer rotor kit for better throttle response. Retard mod on the flywheel, since too much timing makes them snappy off idle, lay down up top. Racers run up top

 

[ItsBrett_205]

Porting the head and manifold(pref the Tak long & low job), and stiffer valve springs will give a good all-around torque curve. Make sure you've got a tight piston to head clearance, .030" or so. A cam is OK, if you have a closer ratio trans, but the stock 5.25/5.5mm one is pretty nice overall. Add a YX 160-type outer rotor kit for better throttle response. Retard mod on the flywheel, since too much timing makes them snappy off idle, lay down up top. Racers run up top

could I shim the vavle springs to make them a little stiffer?

 

[firepower354]

could I shim the vavle springs to make them a little stiffer?

Adding preload will help, but isn't really making them stiffer.

 

[ItsBrett_205]

Thanks a lot.