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Richard Phillips
Richard Phillips
San Luis Obispo, CA
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Allan G, gavin eisler, Nick H, slofut
Total Likes: 5
Original Post (Thread Starter)
by Vintmoto
Did I read on the forum that the 650 motor actually can deliver more power with the slightly smaller 500 pies? Thr reason I ask is that I had my head done a Memphis Motor Werks, it had smaller stubs installed. I thought at the time it was a mistake. So I put in a regular set. The bike runs awesome after the work done on the head, but I keep wondering. I should just call him, but he has been hard to reach for medical reasons.

If any tuners out there could let me know if there is something to this.

Thanks in advance,

Liked Replies
by quinten
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3 members like this
by Adam M.
Adam M.
This is confirmed in Mr Pike memoirs - Ariel copy of A10 had worse acceleration / speed and less horsepower because of bigger diameter exhaust pipes. Smaller diameter pipes give better speed of exhaust gases. This is I think why Japanese manufacturers developed double exhaust pipes, they optically look bigger and don't discolor the chrome on them.
1 member likes this
by gavin eisler
gavin eisler
Thats not what Paul Dunstall found
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