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May 20th, 2004, 04:00 AM   #1
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GW G3 Camshaft - Revs out like a 450 !

Just to update those with an interest,

Replaced my rocker arms on my 2002 650 SM. They were fine, no play at all. The new rocker arm assembly were though. The new exhaust rocker had so much play on the shaft I sent the thing back and the new one was fine. Watch out for this, check the radial play on the shaft before re-fitting. A new rocker should be quite tight but rotate freely.

Along with these I replaced a stretched cam chain (silver one) which was gone after only 60 hours ! I replaced it with the black Regina cam chain, this one is quite a bit wider and looks more substantial. The drive sprocket and cam sprocket were fine and unworn.

I changed the cam (53) for a GW G3 camshaft, jeez this cam really lets the motor rev out, it keeps on reving !

It has lost some bottom end though but being a 650 has loads a runt anyway and then going absolutely crazy up top. I think its given the top end a few more ponies and the bike now pulls a much higher top end speed.

I want to get a higher compression piston when the finances allow.

Beware though, the higher lift and duration cams make for easier kicking over but harder starting. Mine is quite a pain to get going now even after tuning the carb. It seems u have to get the dynamics just right for it to fire.

Great little rev'er now though and I think it would be great for long tracks or road racing.

Lloyd.
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May 20th, 2004, 10:13 AM   #2
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Lloyd

what is the lift in MM of that cam please?

Taffy
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May 20th, 2004, 02:03 PM   #3
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Originally Posted by Taffy
Lloyd

what is the lift in MM of that cam please?

Taffy
Speaking of cam specs. does anyone have the lift and duration of the stock cams?
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May 21st, 2004, 12:25 AM   #4
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i have measured the '01' from closed to closed (as opposed to 1mm lift) but as the '01' is the mildest cam of all then doubt it worth worrying about.

Taffy
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May 22nd, 2004, 09:19 AM   #5
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Re: GW G3 Camshaft - Revs out like a 450 !

Originally Posted by Supermoto_Husaberg
Just to update those with an interest,

Replaced my rocker arms on my 2002 650 SM. They were fine, no play at all. The new rocker arm assembly were though. The new exhaust rocker had so much play on the shaft I sent the thing back and the new one was fine. Watch out for this, check the radial play on the shaft before re-fitting. A new rocker should be quite tight but rotate freely.

Along with these I replaced a stretched cam chain (silver one) which was gone after only 60 hours ! I replaced it with the black Regina cam chain, this one is quite a bit wider and looks more substantial. The drive sprocket and cam sprocket were fine and unworn.

I changed the cam (53) for a GW G3 camshaft, jeez this cam really lets the motor rev out, it keeps on reving !

It has lost some bottom end though but being a 650 has loads a runt anyway and then going absolutely crazy up top. I think its given the top end a few more ponies and the bike now pulls a much higher top end speed.

I want to get a higher compression piston when the finances allow.

Beware though, the higher lift and duration cams make for easier kicking over but harder starting. Mine is quite a pain to get going now even after tuning the carb. It seems u have to get the dynamics just right for it to fire.

Great little rev'er now though and I think it would be great for long tracks or road racing.

Lloyd.
Hmm, might be something for me.
Where did you get it and how much did you pay?

Daniel
www.supermotard-racing.com
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May 22nd, 2004, 02:11 PM   #6
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I remember that Dale published some very detailed graphics on the differences of the cams mentioned. Unfortunately all is lost... Perhaps Dale, could you please shed some light on this issue ?
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May 23rd, 2004, 04:04 AM   #7
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the standard cams are graphed in dale's gallery.

Taffy
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May 24th, 2004, 03:48 AM   #8
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The lifts and durations for the G1, G2 & G3 GW camshafts.

I fitted the G3 to my standard piston'ed 2002 engine with a race can and Mikuni pumper'ed engine.

G1 - in 267° 10,65mm
ex 256° 10,00mm

G2 - in 271° 10,45mm
ex 259° 10,35mm

G3 in 271° 10,45mm
ex 269° 10,50mm

Lloyd
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May 24th, 2004, 04:06 AM   #9
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thanks for that lloyd, it would appear that your figures don't really tell us the whole story. the overlap and times of opening and closing will dictate the power curve.

i would imagine the G1 is the 'cooking' cam and the 'G3 track use only' type o thingy!

i know that checking around last year we were given a link to a german husey dealer who sells these.

do you know whether the cams will work on anything smaller than a 650?

Taffy
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May 24th, 2004, 11:06 PM   #10
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I heard the G3 works great in the 450. Its a real rev'y cam, but don't take my word for it.

GW link: http://www.gw-racing-parts.de/english/index.php

Go to tuning kits then select your machine.

Speak to the company and they will tell u what works.

email: info@gw-racing-parts.de

The G3 is recommended to work with the JE high comp piston.

Lloyd.
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