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Author Topic: Aluminium Big Bore Kits: Unsuitable for Derbi's Frames  (Read 276 times)

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Offline Clint Eastwood

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Aluminium Big Bore Kits: Unsuitable for Derbi's Frames
« on: August 31, 2017, 03:17:35 PM »
Lightweight cylinder = too much high frequency vibration.

RMU manufactures sport bikes with Malossi 70 / 80 aluminium kits as stock equipment. Their frame mounts are reinforced to endure those vibes. Derbi's certainly ain't. This Malossi 80 kit cost me 275. Its useful purpose was made completely redundant soon after beading-in procedure.



Back to the drawing board. Stick with the heavyweight cast iron kits :twocents:

Offline m in sc

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Re: Aluminium Big Bore Kits: Unsuitable for Derbi's Frames
« Reply #1 on: August 31, 2017, 03:28:52 PM »
oof. can you reweld and add a support off the head stud to a higher part of the frame (if there is one?)
get off my lawn.

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Offline Clint Eastwood

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Re: Aluminium Big Bore Kits: Unsuitable for Derbi's Frames
« Reply #2 on: December 06, 2017, 10:59:22 PM »
Suzuki Valenti RME 50's use the same engine.



Those engine mounts are way chunkier.