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BMW Technical Q&A, Primarily R65 / Re: R65 missing
« Last post by Bob_Roller on June 07, 2026, 02:31:45 PM »What clearance are you setting the valve gap at ??
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72
BMW Technical Q&A, Primarily R65 / Re: R65 missing
« Last post by Tiedie on June 07, 2026, 12:21:02 PM »Funny you posted this.
Just dropped off my LS with the 860 kit after the break in period and he's going to change the jets around on the Dyno to see which is better 142's or the 140's, change the oil and filter check the valves. And see if we need to leave them a little loose.
Just dropped off my LS with the 860 kit after the break in period and he's going to change the jets around on the Dyno to see which is better 142's or the 140's, change the oil and filter check the valves. And see if we need to leave them a little loose.
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BMW Technical Q&A, Primarily R65 / Re: R65 missing
« Last post by Loan Rider on June 07, 2026, 06:16:33 AM »1979That's what I was afraid you were going to say. That's the same year as my bike!
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BMW Technical Q&A, Primarily R65 / Re: R65 missing
« Last post by Happy Eeyore on June 06, 2026, 06:21:08 AM »1979
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BMW Technical Q&A, Primarily R65 / Re: R65 missing
« Last post by Loan Rider on June 06, 2026, 05:52:07 AM »Nate says "bad valves, recessed, common problem on your year bike."
What year bike do you have?
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BMW Technical Q&A, Primarily R65 / R65 missing
« Last post by Happy Eeyore on June 06, 2026, 04:43:10 AM »Well the R65 now is running strong without a troubling little hitch or miss. I chased that little miss all around. Bean can, electrical, carbs, gas filters, balancing etc all the standard stuff. No joy. Finally bought some cheap testing gauges and did a compression check and that was ok. Then did a leak down. Not so good. Pulled the heads cylinders and pistons and took them to Boxer Works in Watkinsville Georgia. Nate says "bad valves, recessed, common problem on your year bike." He had the next door machine shop completely rebuild the heads and Murrey, one of his mechanics, recommended that I change the cylinders and pistons at the same time because of general wear and ordered the 860 Sieben Rock parts.
I did the assemble work because I am a certified shade tree mechanic. Bike stated first roll over. I have started the break in cycles and did a first ride. The old bike did just fine so I probably had all the parts back in the right order.
Boxer Works will probably be around for a long time because the owner charges for their work and it was not cheap. I am happy with the outcome.
I did the assemble work because I am a certified shade tree mechanic. Bike stated first roll over. I have started the break in cycles and did a first ride. The old bike did just fine so I probably had all the parts back in the right order.
Boxer Works will probably be around for a long time because the owner charges for their work and it was not cheap. I am happy with the outcome.
77
BMW Technical Q&A, Primarily R65 / Re: Bent Valve
« Last post by vontresc on June 05, 2026, 01:30:55 PM »So I pulled the heads, and it looks like the other valves all need replacement. I kinda figured that. But here's my next question. I was looking at the guides, and they still seem in spec, but I found it off that none of them had the retainer clips. Also the grooves for the clips were 2-3mm above the valve head. Has anyone else ever run across this? it is consistent across all guides.
78
Misc. Technical Discussion / Re: Tyre Sizes, Tubes & Choices (Tires)
« Last post by Loan Rider on June 04, 2026, 03:31:08 AM »I had already ordered before your reply, but as soon as I have refitted flywheel, clutch, gearbox, swing arm and final drive (all of which I removed to replace the crankshaft oil seal...) I know I will now be able to get the rear tyre on too. And yes, new inner tubes too. I'm looking forward to experiencing the handling on fresh rubber as soon as my resurrection of the bike is complete. Thanks.
79
Misc. Technical Discussion / Re: Adjust Steering Bearings Advice - 1979 Model
« Last post by dogshome on June 03, 2026, 12:40:29 PM »Definitely clean and inspect the bearing races. If there are any skid marks, corrosion or (likely) little ribs in them where the rollers have 'sat', swap them out.
As for tension, yes, tighten lightly with a spanner (spart plug sort of tight) then back off a little. The steering should drift from side to side easily, but with no looseness. I didn't have to do ant twiddling of the top nut once set, as the threads are quite tight and fine.
As for tension, yes, tighten lightly with a spanner (spart plug sort of tight) then back off a little. The steering should drift from side to side easily, but with no looseness. I didn't have to do ant twiddling of the top nut once set, as the threads are quite tight and fine.
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Misc. Technical Discussion / Re: Tyre Sizes, Tubes & Choices (Tires)
« Last post by Tiedie on June 02, 2026, 05:27:52 PM »Yes it can be done. I am running Avon Roadrider MX ll 90/90/18 on the front with a 120/80/18 on the rear of an 84" R65LS. I live in the mountains of WNC and so far it's been a great combo. As you know it's best tochange out your tubes at the same time you do tires.
Hope this helps.
Hope this helps.