Yoshimura Cams for the 83-86 TSCC GS550E????

[Anonymous]

I recenly won a pair of Yoshimura cams on E-bay for the 83-86 TSCC engined GS550's. Does anyone remeber these. What they gave for performance etc?

Here are the specs:

Grind #SUX121 these could not be found on the Yosh web site.

Intake = 5.1mm stock is 4.83mm or .200" instead of .190"

Exhaust = 5.1mm stock is 4.34mm or .200" instead of .170

They also have POPY stamped on the cam near the cam gears. The lobes lokk wider wich means they have a higher duration correct? I also put my calpers on them and the lobes are slitely taller.

Any help would be appreciated.

Jesse

[Carter Turk]

Yosh cams

Not the same cams, but my wife had mega cycle cams in her 83 550ES. I believe they were a bit lumpier with more duration, but I don't know much about cams. I bought it from a guy who raced mini dinosaur class a SIR. The bike had no low end but once the tach hit 6800 or so it would scream. Super fun to keep the bike on the boil on roads where the corner were close together. Carter

[Anonymous]

Thanks Did you have to replace the valve springs with aftermarket heavy duty type because of the higher lift?

[Carter Turk]

yosh cams 550

Probably a good idea, but I don't know if it was done. Carter