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You have pre-Nikasil iron bores. That right cylinder doesn't look so bad to me. I'd go for the new rings, a hone job and new gaskets. Should be fine.

Of course doing more is more expensive but may give better results.

I used a 2.91 final on my R90/6 for a year or more. The plain Jane /6 came with a 3.09. I really liked the higher gearing of the 2.91 on the highway and didn't miss the off the line acceleration any after I got used to it. I have a speedo to match either final but with any combination of final and s...

ME 109 said; "Still a mystery to me tho why that switch is needed in my '81." Which switch is used depends on which shift cam is in the trans. Earlier bikes had a bump on the cam and later bikes were a depression. So the switches work in a reverse manner from each other. Only reason I can ...

I also have used Hiflo filters for years, only about 5 years tho. Hiflo makes only one filter for our bikes. The HF 161 and it is for the non-oil coolers. It is not bendable. I forget the source but they had really cheap prices so look around.

Don't know about that second problem you have with the 5th gear. Is it a problem? I haven't had one apart recently. I'll try to look at some parts later if I get to the shop. But as far as shifting the transmission on the bench? They don't shift on the bench very well if at all. So you can't infer m...

Before you do anything else look up the numbers on the title, the frame and the engine block. All these numbers should match. It is a 7 digit number. Once you have the number or numbers then check this number on one of the many sites that have the info about what bike that number goes to. Looking it...

You say the gearing is fine on the twisties so that's the lower gears. If you change the final drive you will have taller gears in all the gears. I would say the taller 5th gear is for you. Opening the gearbox just for this gear change doesn't make much sense but if it has enough miles that refreshm...

It is oxidation and cleaning will only be a temporary solution. The clean aluminum will oxidize again. I spray with WD-40 on a regular basis. Doesn't look as good as those cleaned and polished or soda blasted boxes but it is better than the white speckled effect. I have used Mag Wheel Polish on some...

I think your clutch is good to go as long as it was working when you pulled it out and the parts are not too far tapered. Don't think that 4.66 is too close to the minimum. 4.5 is the minimum and some will go lower than that. It's been done. When they go you have to replace everything. That's both p...

BMW clutch cables are being made by a different company or maybe just a different machine these days. The swaged ferrule on the end of the cable is likely binding in the nipple holder (part shown above). The ferrule is swaged with hard sharp corners. These can be rounded off with a file. Once instal...