I have purchased a couple of parts from RPI for My +8 Bitsa 3.5. Lightened flywheel, motor mounts and stole a exhaust header design. Chris Crane was very forthcoming with advice and suggestions. His website is informative and useful. I would use there services more if I lived in the UK.
As a US'er I have had very good service from Mark at D&D Fabrication in Michigan. Highly recommend D&D. However they have no truck with EFI. Carbs only. Not sure why no EFI.
I asked and the answer is Why? Carbs do just fine.
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Seattle
