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

Offline JustinLonghorn

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #30 on: Sep 08, 2017, 10:19:59 »
She sure is purrdy.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline SONIC.

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #31 on: Sep 08, 2017, 11:13:15 »
Getting there!

Question on the spark plug shorts....why not just pull the cap off the plug? just easier and quicker to short it for a second to listen?


Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #33 on: Sep 08, 2017, 12:34:04 »
Thanks guys.

And sonic, there is a bunch of debate on that. Some claim that anything with points is safe to do just that. Some claim that you shouldn't pull plug caps on anything post /5. I figured for $7 I would just make up some short rods and not risk it.

You definitely don't want to pull caps with most (if not all) electronic ignitions.

John Deere made a snowmobile back in the day called a spitfire that had a unique to it c.d.i. ignition. If you didn't have the cap on the plug and pulled it over ONE TIME it was fried. Now, there are none of those boxes left, so many of those sleds are sitting around in good shape with a fried box that isn't available anymore.

I did light myself up even with the short rods. I grabbed a file instead of a screw driver the first time and it had a wood handle with a metal sheath up a little farther than I had realized lol live and learn.
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 #34 on: Sep 25, 2017, 11:45:45 »
Well it felt good to finally have a vintage bike that I felt was dependable enough to do the distinguished genltlemans ride. Round trip was about 180 miles, and the ol lass handled it great. About 70% of those miles were 4 lane interstate traveling at 70+ mph and she didn't skip a beat (though interstate riding isn't gonna be what I continue to do for fun lol)

I am very happy with the old girl so far. Its low on thrills, but is by far the most pleasant, well mannered and refined vintage bike I've ridden or owned to date.

The only issue ive had is the need for fairly constant head re torqueing and valve adjustment after having the top end off. Luckily, there is no easier bike to torque the heads and adjust the valves on. 3 nuts and the cover is off. You don't even have to pull the tank. Its great.

A few shots from the weekend.




Where's waldo?


Back home safe and sound
« Last Edit: Sep 25, 2017, 11:47:20 by HURCO550 »
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 CrabsAndCylinders

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #35 on: Sep 25, 2017, 16:09:12 »
Do you mean that you will adjust the valves more than the factory says you have to?

Mine has a 1976 and I would ride it long distance if it didn't have clip-ons and a Cafe seat.  These engines run for ever. 

Glad you had a nice ride :)

Brian
Lighter, Quicker, Faster.
ZX-14, 900F x 2, 1100F, R100, CBR600, SR500, GT500, RZ350, KZ1000 x 2, Moto Guzzi Lemans lll, CBX550, RD 350, 750 SOHC police special, RG250, TL1000R, GT750, KTM Super Duke 1290 R, Harris/Z-1, Norton 750 Commando, Green 77 KZ650

Offline SONIC.

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #36 on: Sep 25, 2017, 18:43:25 »
Curious as well about the valve adjustments.
Perhaps some light locktight is in order?
You haven't had it long enough to need a valve adjustment....

Offline irk miller

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #37 on: Sep 25, 2017, 18:51:05 »
I just clocked over 600 miles since my rebuild and last valve adjustment.  I re-torqued the heads once after a few heat cycles, though.

Offline HURCO550

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #38 on: Sep 25, 2017, 21:24:06 »
Curious as well about the valve adjustments.
Perhaps some light locktight is in order?
You haven't had it long enough to need a valve adjustment....
I had the top end completely off for push rod tube seals. I have torqued the heads/ adjusted the valves 3 times in the 300ish miles since putting the top end back together. The nuts aren't loose, the studs are just stretching I think

Sent from my SM-G920V using Tapatalk

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 SONIC.

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Re: BMW R90/6.. un-farkle to re-farkle
« Reply #39 on: Sep 26, 2017, 18:20:21 »
I had the top end completely off for push rod tube seals. I have torqued the heads/ adjusted the valves 3 times in the 300ish miles since putting the top end back together. The nuts aren't loose, the studs are just stretching I think

Sent from my SM-G920V using Tapatalk

Well i hope that stops soon lol that would render the bike useless in my eyes! Mine get an oil change every season and that's about it!