Modern Vespa : 300 hpe cam questions

300 hpe cam questions

OP jerryd UTC details Addicted 2010 gts 300 super. 09 MP3 500 lite Joined: UTC Posts: 982 Location: tampa
OP jerryd Addicted 2010 gts 300 super. 09 MP3 500 lite Joined: UTC Posts: 982 Location: tampa	UTC quote why are there A, B, and C cams? will the hpe cam work in a 2010 300?

SteelBytes UTC details Veni, Vidi, Posti 2019 GTS300 HPE SuperTech 65,000km Joined: UTC Posts: 6556 Location: Batmania aka Melbourne, Australia
SteelBytes Veni, Vidi, Posti 2019 GTS300 HPE SuperTech 65,000km Joined: UTC Posts: 6556 Location: Batmania aka Melbourne, Australia	UTC quote jerryd wrote: why are there A, B, and C cams? will the hpe cam work in a 2010 300? Iirc the a,b,c after paired with different thickness gaskets (top or bottom?). Something about tolerances. It's a completely different head eg the pre-hpe rockers didn't have rollers whereas the hpe do. Wouldn't bother trying.

pullmyfinger UTC details Hooked Some Vespa, some Yamaha, some Suzuki, some Kawasaki, some Honda... Joined: UTC Posts: 248 Location: Hamilton, Ontario
pullmyfinger Hooked Some Vespa, some Yamaha, some Suzuki, some Kawasaki, some Honda... Joined: UTC Posts: 248 Location: Hamilton, Ontario	UTC quote Different letters have to do with tolerances during machining. Depending on 'quality' it is then paired with a cold start weight of same letter. The purpose is to ensure correct bump height for cold start. The letters have nothing to do with different lobes or anything else. Just making best of sloppy machining quality control. Positive

OP jerryd UTC details Addicted 2010 gts 300 super. 09 MP3 500 lite Joined: UTC Posts: 982 Location: tampa
OP jerryd Addicted 2010 gts 300 super. 09 MP3 500 lite Joined: UTC Posts: 982 Location: tampa	UTC quote Thanks guys. I wasnt aware the hpe had roller rockers. I would guess the a/b/c were slightly different bearing journal size. I was asking hoping to use hpe Malossi cam. but roller rocker would require change in cam profile. so no go.

pullmyfinger UTC details Hooked Some Vespa, some Yamaha, some Suzuki, some Kawasaki, some Honda... Joined: UTC Posts: 248 Location: Hamilton, Ontario
pullmyfinger Hooked Some Vespa, some Yamaha, some Suzuki, some Kawasaki, some Honda... Joined: UTC Posts: 248 Location: Hamilton, Ontario	UTC quote I'll take a look later if dimensions are different between two cams. It actually doesn't matter to cam lobes if they are pushing a roller of flat tappet arm in this instance as the head architecture is similar. What matters is only if the lobe height is different and makes improvement. A quick look suggests they are similar. Positive

Motovista UTC details Veni, Vidi, Posti GT 200 Joined: UTC Posts: 9236 Location: Main Street, Watts
Motovista Veni, Vidi, Posti GT 200 Joined: UTC Posts: 9236 Location: Main Street, Watts	UTC quote jerryd wrote: Thanks guys. I wasnt aware the hpe had roller rockers. I would guess the a/b/c were slightly different bearing journal size. I was asking hoping to use hpe Malossi cam. but roller rocker would require change in cam profile. so no go. Malossi makes a cam for the HPE, and they likely know the HPE has roller rockers.

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