Q and A: Gauge Rebuilders, Oil Types, and CB350


Keith Fellenstein Tech Corner 

Gauge rebuilders

Q: I have a 1981 Suzuki GS750L that I’m rebuilding for the 3rd time. I need to get the tachometer and speedometer rebuilt. Could you suggest a company here in the U.S.? 

Steven Rondeau/via email

A: I didn’t know of any offhand so I had to search a bit and found this fellow who specializes in Suzuki speedometers. Contact him and see what he has to offer. I hope this helps:

Help this reader

Q: Hello Keith, I have a Rumi Formichino scooter that needs a crankshaft rebuild (seals and bearings). Do you know anyone in the U.S. who can do this? Thanks in advance.

Joe Mensch/via email

2/19/2021 9:50:55 AM

Honda CB 350 had similar problems on my 1970 CL 350, right-hand cylinder very rich, the o-rings on the main jet had perished and was letting excessive fuel through, they should be a good seal. Also had the same problem with leaking brass tube, cured it with solder.

2/18/2021 4:34:42 PM

Keith, a thought on Bill's oil thoughts. It has been awhile since I had the need, but you can often spot oil with 'excess' friction modifiers by checking the label for phrases like 'lower emissions or better mileage'. Good old GTX 20/50 may be fine or even 10/40. Comparing labels or going to a motorcycle specific oil may be the best path. I've done both in the past. Also, +1 on the full synthetic 2-stroke oil. Best thing to happen for smokers.

2/18/2021 4:29:26 PM

The guy with the oil question should know the oil he is adding is lubing the gearbox. The Autolube injection is the only oil lubing the crank.

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