Advancing cam on HS?

wheelbender6 · Mar 13, 2014

I was reading on ADVrider where a member advanced his exhaust cam one tooth on his KLR-650 and it really woke up the performance. Has anybody tried that on a 50cc Huashang?
I realize the HS has only one cam, but I was trying think of some mods that don't cost much. Last I heard, performance cams are no longer available for the HS.

Theon · Mar 13, 2014

For more top end you usually retard cam timing on a 4 stroke.
On my Suzuki Sierra(Sameri) I have retarded cam timing, and she turns into a motorcycle engine at about 3500 RPM, but significant drop in low end torque.
Has made the engine a pig on the road, but a lot of fun in the bush.
Advancing cam timing will improve low down but sacrifice top end.

2door · Mar 13, 2014

Altering lift or duration on a cam will give you something and take something away. You either build for low end or high end. Whichever you build for will make the opposite end suffer. Same for advancing or retarding the valve position at a given crankshaft location.

In short, there's no free lunch.

Tom

wheelbender6 · Mar 13, 2014

The guy that advanced the exhaust cam on the KLR 650 said it eliminated some flat spots in the torque curve. Perhaps, since he advanced only the exhaust cam, he added some torque without sacrificing much top end performance.

McBob · Mar 16, 2014

http://www.affordablegokarts.com/mm...ode=A&Product_Code=1610&Category_Code=MTRBK49
Check out AGK for cams
McBob

GearNut · Mar 16, 2014

To affect the timing of only the exhaust valve I suppose that you could weld and re-profile the Exhaust cam guide. Put a concave arc to it so it lifts the valve later but still gives full lift travel.

wheelbender6 · Mar 16, 2014

Thanks McBob. I didn't realize AGK had a line of 4t motorized bike performance parts.
http://www.affordablegokarts.com/mm5/merchant.mvc?Screen=CTGY&Category_Code=MT

scotto- · Mar 17, 2014

I've got an AGK race cam in one of my HS49's.......it's the fastest HS49 in town! But it has more mods than just the cam

If you want proof just let me know.

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Advancing cam on HS?

wheelbender6

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Theon

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2door

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wheelbender6

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McBob

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GearNut

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wheelbender6

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scotto-

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