Vintage BMW Motorcycle Owners

good info Mac.

Rick Griffith

I've replaced many of them and with the 11 lb. original flywheel, balancing of the component's wasn't necessary. On one R90s with a lightened flywheel, I sent the whole assy. (flywheel and all new clutch components) out for balancing.

Early on in the ownership of my '74 R90s, I was stupid and replaced the original Everbest petcocks with Karcoma's. Put the Everbest's in the trash since they didn't seem rebuildable. The Karcoma's worked very well over the last 38 years, but cursed myself for pitching them. So I was pleased to find ...

Thank You Randy,

I'll check my wiring this evening. Sort of an issue that is low in priority but still would like it working correctly.

Rick

I've had this problem for awhile, just feeling like I should finally figure it out. Bike is my mostly orginal '74 R90s (early Oct. '73 production). I replaced the aging wire harness about 10 years ago and since then I've had the problem where if the clutch lever is pulled in (tranny in gear), the ne...

Month long review on the Alpha electronic ignition I installed in my R90s. My '74 R90s started having points gap issues a couple years ago. Always a fan of the original points and condenser (and I still used my old dwell meter on occasion...), I was reluctant to switch them out to electronic. Years ...

I used a Loctite sealant that worked. I learned the following: apply a thin bead (carb detached) and let it skin for a few minutes assemble carburetor over the manifold WITHOUT tightening the clamp wait 24 hours Tighten clamp Start motor and check seal with carb cleaner Verify that rpm doesn't chang...

I talked to Randy Long (BMW Machinist) and he suggested Permatex Gasket Maker. It's sold at NAPA and is used on intake manifolds and i fuel proof. That still didn't work so now I'm thinking of using a very thin o-ring to slip over the manifold that will allow the carb to slide over that. Better yet ...

Hi Kurt,

yes, the Dellorto's are different in that there is no rubber connector between the carb and manifold. The manifold's are unique to the R90s also, due to the larger Dellorto's.

See the image, where #4 (insulator) is the part inside the carb that forms the seal around the manifold.

I've discovered that my left side Dellorto has a vacuum leak where it connects to the intake manifold. Specifically, when I spray carburetor cleaner where the carb connects to the manifold, the engine rpm falls drastically. The carb has an insulator bushing that should seal on the manifold and mine ...