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Search: Posts Made By: 983Bob
Forum: Airheads 12-15-2014, 08:16 AM
Replies: 18
Views: 947
Posted By 983Bob
Shift problem

Check the installed depth of the seal. If it isn't in far enough, the face of the seal can drag against the inside face of the shifter stub, causing it to not return properly. You may just need to...
Forum: Airheads 12-13-2014, 09:29 AM
Replies: 54
Views: 2,538
Posted By 983Bob
Long Rod Motor

About fifteen years ago, I built an 850 using the 650 crank and /7 rods and pistons {94] with squish band heads that had the inlets re-angled out about 10degrees. This was just an experiment as I...
Forum: Airheads 12-10-2014, 09:04 AM
Replies: 54
Views: 2,538
Posted By 983Bob
R65 rebore

Hello. If you try to use 800 pistons, you will face many obstacles. The first is that the R80 piston is 7.5mm taller[above the wrist pin] than the R65. Even when you subtract the shorter stroke, you...
Forum: Airheads 12-08-2014, 08:32 PM
Replies: 4
Views: 227
Posted By 983Bob
Blown fuse

When the bike tipped over, either the grey/black or green/black wires were pinched and shorted out. If the ignition was on,this would blow the fuse and disable the turn signals and horn. The fuses...
Forum: Airheads 12-05-2014, 09:22 AM
Replies: 75
Views: 2,631
Posted By 983Bob
77rs

I remember this bike when it belonged to the original owner. We used to blitz down from Toronto to the Harrisburg Motorcycle club grounds for the Dutch Country Rally. That's where I remember Norm...
Forum: Airheads 04-13-2014, 10:22 AM
Replies: 18
Views: 1,541
Posted By 983Bob
oversize piston

That piston is marked 94.21 which is the only oversize offered by BMW. The old squish band pistons went NLA back in the 80s and only the later profile style were available. Their contour matches the...
Forum: Airheads 04-13-2014, 09:32 AM
Replies: 58
Views: 4,838
Posted By 983Bob
valve clearance

Three likely scenarios for this condition are, a worn cam lobe and lifter. A good way to check this is to recheck the clearance several times, each time turning the motor over a full cycle. If the...
Forum: Airheads 01-14-2014, 05:48 PM
Replies: 88
Views: 3,703
Posted By 983Bob
cold start

You might want to check that the grease between the control unit and the heat sink is fairly fresh. I normally clean and re-grease this area as part of my regular service every three years. Also, I...
Forum: Airheads 03-25-2013, 09:07 AM
Replies: 39
Views: 4,556
Posted By 983Bob
Krauser heads

The renewed interest in these heads is interesting. Three of us had them here in Ontario back in the day. [1990] The set on my bike was fully re-engineered by a friend of mine who was the top...
Forum: Airheads 03-10-2013, 09:59 AM
Replies: 10
Views: 936
Posted By 983Bob
Yes, We are in Prince Edward County. There are...

Yes, We are in Prince Edward County. There are all kinds of picturesque roads to ride down here!
Cheers
Bob
Forum: Airheads 03-07-2013, 10:43 PM
Replies: 10
Views: 936
Posted By 983Bob
All of the /5-early /7 had the old style float...

All of the /5-early /7 had the old style float needle part#1311 1254 767,including the 600 with the slide carbs. The rubber tipped needles were introduced on the 40mm bings in 77 and the smaller 32s...
Forum: Airheads 03-07-2013, 06:52 PM
Replies: 10
Views: 936
Posted By 983Bob
The triangular float needles are greater in...

The triangular float needles are greater in diameter and will not fit the older model carbs and they too can sometimes leak. We just used to replace the needles and floats at the same time usually...
Forum: Airheads 12-09-2012, 11:02 AM
Replies: 63
Views: 5,291
Posted By 983Bob
I've been following this thread and the cam...

I've been following this thread and the cam thread for some time so I decided to do some research of my own. The motor I'm using as my street rod was built from the outset with the 336 BMW cam. At...
Forum: Airheads 10-23-2012, 08:22 AM
Replies: 11
Views: 1,073
Posted By 983Bob
Hi Georges. I sent the bushings off yesterday but...

Hi Georges. I sent the bushings off yesterday but since I've never sent anything to France before, I don't know how long it will take. I did send them air mail.
Cheers
Bob
Forum: Airheads 10-21-2012, 09:09 AM
Replies: 11
Views: 1,073
Posted By 983Bob
bushings

Hi. I have a pair of used but good bushings in stock from a unit with a failed Hall sensor. If you send me a PM with your address and name, I can fire them off in the post to you.
Cheers
Bob
Forum: Airheads 10-16-2012, 01:18 PM
Replies: 10
Views: 945
Posted By 983Bob
The old part# for the 500/600 crank was 1121 1255...

The old part# for the 500/600 crank was 1121 1255 290 and the 750 was 11211259 856 including early /6 [to 76] which used the longer and stronger 10 mm bolts. The 900 part# was 1121 1262 450. The...
Forum: Airheads 10-12-2012, 03:14 PM
Replies: 6
Views: 963
Posted By 983Bob
Hi Obi. I have vm 36 s on my 76 900 which is...

Hi Obi. I have vm 36 s on my 76 900 which is stock except for the carbs. The main jet works out to 210,[I wouldn't go higher than 220] 2.5 slide, Q-0 needle jet stock needle in the middle position...
Forum: Airheads 07-10-2012, 04:06 PM
Replies: 4
Views: 558
Posted By 983Bob
pin length

If it would be of any help, the r60/5-7 pin is 60mm but of course is heavier. I do have a pair of them [used] that I could ship but it would probably cost a fortune in charges. If you can't get a...
Forum: Airheads 07-10-2012, 09:58 AM
Replies: 4
Views: 558
Posted By 983Bob
Pin Length

Hi, This is my first post on this forum. I just went out and measured the pin length and it is 58mm.
Cheers
Bob
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