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Title: Megacycle cams ?
Post by: munkeyboy on April 10, 2005, 09:18:37 AM

Hi i am in the uk and was wondering if any body has used megacycle cams in there gs500 and if they are any good :dunno: . I have been on the net and can only find the cataloge for jan 2004,does any one know if they are still in business and if i can get hold of a cataloge or email for them. Any info would be appreciated. :)

Title: Megacycle cams ?
Post by: dgyver on April 10, 2005, 03:34:18 PM

I have their cams in 2 of my motors and YES they do make difference. Depending on which profile will determine how much difference. I run the .417 lift cams. The catalog on their web site www.megacyclecams.com probably is the same for '05 except for newer model bikes.

Title: Megacycle cams ?
Post by: munkeyboy on April 12, 2005, 10:32:25 AM

Thanks for the reply do you know if they have an email address? Also did you buy the modified pistons or have them machined.

Title: Megacycle cams ?
Post by: dgyver on April 12, 2005, 11:08:18 AM

Suprisingly they do not have an email listed on their site. I will look to see if they have an email address on any of the paper work that I have. You may want to try sales@megacyclecams.com

I do have different pistons. One motor has Wiseco 79mm made for the GS but no longer available (I wish I could find a 4th) and the other has Wiseco 78mm GPZ pistons which are a stock item for them.
http://gstwins.com/forum/viewtopic.php?t=14401

Also, I am running heavier valve springs which gains about 2000 rpms before valve float. Next is to switch to shim under bucket.

Title: Megacycle cams ?
Post by: goat on April 12, 2005, 01:55:36 PM

I'm assuming that you are using one of the cams that require modified pistons. Did you have to modify the 78mm Wiseco pistons?

Title: Megacycle cams ?
Post by: dgyver on April 12, 2005, 02:07:19 PM

The higher compression pistons will have valve reliefs cut in them. There is still enough valve to piston clearance with stock pistons.

The 78mm GPZ pistons may need a little material removed on the ex valve. I noticed a little marking on the piston were the valve hit it when it spit a shim. A dremel will take care of it.

Title: Megacycle cams ?
Post by: 94suzuki500 on April 12, 2005, 03:31:51 PM

is it required to run different pistons? or will you still gain hp by using stock?

Title: Megacycle cams ?
Post by: sprint_9 on April 12, 2005, 11:39:31 PM

Dgyver, when are you going to dyno your 79mm engine? Please say very soon. :cheers:

Title: Megacycle cams ?
Post by: munkeyboy on April 13, 2005, 04:55:49 AM

This is sounding like a good mod and i have not heard of anyone else in the uk doing it plus it may stop people passing me down the straits on track days.

Title: Megacycle cams ?
Post by: dgyver on April 13, 2005, 05:22:44 AM

Quote from: sprint_9Dgyver, when are you going to dyno your 79mm engine? Please say very soon. :cheers:

Not sure when I will.

But....there is a dyno day this Sunday at a local dealer. I have to work but I may get off early enough to make it.

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Main Area => General GS500 Discussion => Topic started by: munkeyboy on April 10, 2005, 09:18:37 AM