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Author Topic: BMW R90/6.. un-farkle to re-farkle  (Read 1943 times)

Offline ridesolo

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #20 on: Aug 17, 2017, 22:25:43 »
Dang, brother, Kim Kardashian could fit on there w/o overhanging!   ::)
“Fight on and fly on to the last drop of blood and the last drop of fuel, to the last beat of the heart.”
— Baron Manfred von Richthofen

Please check out:  http://www.VetTix.org

These are on a low simmer out in the shop:
'75 Honda CL360: http://www.dotheton.com/forum/index.php?topic=56547.0
'70 Rupp Roadster: http://www.dotheton.com/forum/index.php?topic=67459.0

Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #21 on: Aug 27, 2017, 21:59:39 »
Top end put back together with fresh push rod tube seals and gaskets, and the fresh carbs to boot. I didn't do rings at this point as I didn't have the scratch and they were both pushing 145 cold psi per side. If I end up starting to blow smoke, ill do it then, but for now, it'll do. I put er together, clicked the starter and away she went. I'm sure it will need a carb sync, but that will have to wait til tomorrow.





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Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #22 on: Aug 29, 2017, 22:18:57 »
 Time to start syncing the carbs. One known method on airhead bmws is to short out one side then the other using spark plug short rods and a screw driver to the head, until it runs evenly on both. I'm sure this is nothing new to most of you guys, but I figured I'd share my carb sync short out rods. I didn't have the time to wait on a set to order them, and this method is much cheaper. All told I think I have around $7 in the pair. I used two 4 mm by 60 mm long bolts with the heads cut off, two coupler nuts and four standard nuts (all 4mm) as well as a piece of 3/16 inch inside diameter brass tube cut into two equal lengths around 50mm long. All materials  where in the hardware section  of Lowe's. The coupler nut is recessed on the threaded rod enough to screw over the spark plug. I also used two old spark plug thread on terminals. The standard nuts  just act as lock nuts  to keep stuff  from coming apart. These do fit on both Bosch and NGK caps.

Also made up a set of Gatorade bottle vacuum sync gauges. Of course as soon as I went to start it the battery was dead. Oh well, one more thing to chase down lol



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Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #23 on: Aug 30, 2017, 18:20:54 »
New shoes came in the mail today.


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Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #24 on: Sep 02, 2017, 01:19:55 »
 The Gatorade bottles were just a bit too large in volume, so I tried a different route for syncing. I had a set of actual gauges on order, but for the second time this month, for whatever reason, the eBay order got cancelled. Oh well.

Off to harbor freight for a $10 Vacuum gauge (with coupon of course) and a $4 aquarium splitter valve from the big box store. I had to drill out and remove the check valve from the splitter, but other wise it worked well. It would be easier to do with two separate gauges for sure, instead of having to block one off and work back and forth, but oh well, it worked and the job is done I'm pretty sure.



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Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline trek97

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #25 on: Sep 02, 2017, 07:15:16 »
Dude, rather than spend the $4 on the "aquarium splitter".  I woulda loaned you another $6 for the second gauge.   ;)

Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #26 on: Sep 02, 2017, 12:32:00 »
Dude, rather than spend the $4 on the "aquarium splitter".  I woulda loaned you another $6 for the second gauge.   ;)
Ha, valves are needed either way to dampen the vacuum pulse, and not buying the second gauge wasn't a $6 issue, it was more that I didn't trust harbor freights Chinese quality control to have a pair of them that were perfectly calibrated to one another

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Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline trek97

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #27 on: Sep 02, 2017, 21:30:10 »
Ha, valves are needed either way to dampen the vacuum pulse, and not buying the second gauge wasn't a $6 issue, it was more that I didn't trust harbor freights Chinese quality control to have a pair of them that were perfectly calibrated to one another


Even w my purpose built gauges.  When Im done setting.  I swap the gauges on the carbs to see if there is a discrepancy twixed the gauges.

Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #28 on: Sep 07, 2017, 21:02:13 »
New tires mounted and rolled out for some quick pics. Next up, changing out the seat.



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Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline trek97

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #29 on: Sep 07, 2017, 21:08:00 »
The difference you have made in her is already stunning.