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Search: Posts Made By: Max Headroom
Forum: Airheads 12-13-2014, 12:42 AM
Replies: 34
Views: 1,580
Posted By Max Headroom
I have been assembling reconditioned engines with...

I have been assembling reconditioned engines with dry piston rings for many years now. During assembly, the piston skirts get a light smear of oil and the bores remain dry.

The reasons are...
Forum: Airheads 11-10-2014, 06:16 PM
Replies: 93
Views: 6,576
Posted By Max Headroom
Well Billy, the facts were right in front of you...

Well Billy, the facts were right in front of you in the OP's first post on the subject.

Considering that this was a three year old thread dredge which referred to the contents of a PM exchange,...
Forum: Airheads 11-09-2014, 08:54 PM
Replies: 93
Views: 6,576
Posted By Max Headroom
Billy, your poor comprehension skills have let...

Billy, your poor comprehension skills have let you down yet again. You keep repeating this statement, even though nobody I'm aware of has made a claim of "more axial load capability".

Read the...
Forum: Airheads 11-08-2014, 03:36 PM
Replies: 93
Views: 6,576
Posted By Max Headroom
Hi Ritchie, my observation is that the cage...

Hi Ritchie, my observation is that the cage design is the major weakness with the 6403, rather than the load capacity. The 6403 is typically the first bearing to fail in the five speed boxes, and...
Forum: Airheads 11-07-2014, 10:51 PM
Replies: 93
Views: 6,576
Posted By Max Headroom
Hi Terry! Yeah, still around :>)

Hi Terry! Yeah, still around :>)
Forum: Airheads 11-07-2014, 02:31 PM
Replies: 93
Views: 6,576
Posted By Max Headroom
This photo shows the most important feature of...

This photo shows the most important feature of the BMW bearing. The inner race has virtually no radius, to allow the infamous circlip to butt up against it. A generic 6403 will have a more generous...
Forum: Airheads 11-07-2014, 01:48 PM
Replies: 266
Views: 59,504
Posted By Max Headroom
Not that hard . . . .

http://i55.photobucket.com/albums/g124/r90s_2006/BMW%20R90S%20project/myfootpegs4Large.jpg (http://s55.photobucket.com/user/r90s_2006/media/BMW%20R90S%20project/myfootpegs4Large.jpg.html)
Forum: Airheads 11-05-2014, 09:16 PM
Replies: 93
Views: 6,576
Posted By Max Headroom
There's nothing mysterious about rolling element...

There's nothing mysterious about rolling element bearings and their internal clearances. Bearings with C3 clearance are often specified where there is an operating environment involving heat or...
Forum: Airheads 09-12-2014, 03:26 PM
Replies: 1,201
Views: 79,391
Posted By Max Headroom
Henry, it's not unheard of for valve seat inserts...

Henry, it's not unheard of for valve seat inserts to fall out of heads that have never been touched. It's not common either, but the point I'm trying to make is that replacing the heads with another...
Forum: Airheads 08-05-2014, 11:38 PM
Replies: 59
Views: 5,252
Posted By Max Headroom
The bike looks great. Maybe it's the...

The bike looks great.

Maybe it's the photographic angles, but the front fender looks to be back to front?
Forum: Airheads 07-24-2014, 05:34 PM
Replies: 541
Views: 84,807
Posted By Max Headroom
Gidday HW, that CS would make a great bobber...

Gidday HW, that CS would make a great bobber project . . . . . :D
Forum: Airheads 06-30-2014, 10:29 PM
Replies: 59
Views: 3,208
Posted By Max Headroom
The Pursuit of Accuracy

Not a lot of hope then for a voltmeter manufactured by Motometer forty years ago, and still mounted on the bike . . . . . :rofl
Forum: Airheads 06-26-2014, 05:34 PM
Replies: 46
Views: 3,077
Posted By Max Headroom
Given that the front bearing carrier is already...

Given that the front bearing carrier is already out and the guide ring is the only thing preventing removal of the crankshaft, the quickest and easiest way to get the job done would be to re-install...
Forum: Airheads 06-21-2014, 02:58 AM
Replies: 61
Views: 4,937
Posted By Max Headroom
I rang Jim before fitting the mufflers he'd...

I rang Jim before fitting the mufflers he'd developed, and asked him for jetting advice. He said that the 90S tended to run rich on standard jetting, which would work well with his mufflers. So, I...
Forum: Airheads 06-20-2014, 06:33 PM
Replies: 61
Views: 4,937
Posted By Max Headroom
You could find it useful to have a chat to Jim...

You could find it useful to have a chat to Jim Cray. He is UK based and has spent time designing and experimenting with mufflers for airheads in tandem with a dyno. I have a pair of mufflers made to...
Forum: Airheads 05-01-2014, 09:16 PM
Replies: 21
Views: 1,204
Posted By Max Headroom
Personally, the kinematic gear linkage was one...

Personally, the kinematic gear linkage was one change that I didn't think much of.

All it did was to increase the lever travel between gearchanges compared to the direct gear lever fitted to the...
Forum: Airheads 05-01-2014, 05:52 PM
Replies: 21
Views: 1,204
Posted By Max Headroom
I believe that the input shaft cush setup was...

I believe that the input shaft cush setup was upgraded in '88 or thereabouts.

Better gearchange quality came in several stages, with a few of the changes being quite minor but overall adding up...
Forum: Airheads 03-20-2014, 04:24 PM
Replies: 31
Views: 2,008
Posted By Max Headroom
Like a lot of situations, there are a few simple...

Like a lot of situations, there are a few simple things that can make a tricky job easier.

The C-clip can be rotated in its groove using a small blade screwdriver, until one end of the circlip is...
Forum: Airheads 02-24-2014, 07:09 PM
Replies: 45
Views: 3,680
Posted By Max Headroom
This is new information to me. Could you...

This is new information to me. Could you elaborate further?
Forum: Airheads 02-05-2014, 11:59 PM
Replies: 20
Views: 1,151
Posted By Max Headroom
Interesting comment . . . . a friend of mine had...

Interesting comment . . . . a friend of mine had a '78 R100RS some years ago with a troublesome 5-speed, and he fitted a 4-speed temporarily while he sorted the 5-speed. I rode it at the time and...
Forum: Airheads 12-18-2013, 12:10 AM
Replies: 14
Views: 871
Posted By Max Headroom
Yet another +1 for assembly without a gasket,...

Yet another +1 for assembly without a gasket, even on early 'boxes.

I've assembled several with a good quality sealant only, with no resulting leaks.

YMMV etc
Forum: Airheads 12-05-2013, 05:07 PM
Replies: 25
Views: 1,988
Posted By Max Headroom
I think one or two of us might need the contact...

I think one or two of us might need the contact details for such a group . . . . :twitch
Forum: Airheads 12-05-2013, 08:48 AM
Replies: 56
Views: 3,447
Posted By Max Headroom
The later main bearing deign allows a constant...

The later main bearing deign allows a constant flow to the crank journal even if it rotates, but the early design doesn't have slots.

The early bearing shells had oil holes which had to be...
Forum: Airheads 12-02-2013, 11:54 PM
Replies: 56
Views: 3,447
Posted By Max Headroom
Plastigage can't be used in this application.

Plastigage can't be used in this application.
Forum: Airheads 11-29-2013, 02:11 PM
Replies: 7,161
Views: 1,434,737
Posted By Max Headroom
http://i55.photobucket.com/albums/g124/r90s_2006/2...

http://i55.photobucket.com/albums/g124/r90s_2006/23-11-2013A_zps3fae8c6e.jpg (http://s55.photobucket.com/user/r90s_2006/media/23-11-2013A_zps3fae8c6e.jpg.html)

Hi Bob, the black bike is a one...
Forum: Airheads 11-28-2013, 07:00 PM
Replies: 7,161
Views: 1,434,737
Posted By Max Headroom
Good guess. I have a strong connection with the...

Good guess. I have a strong connection with the DO R90S, as I seriously considered purchasing it in '89 when it first arrived into NZ. It had the Lesters, a fork brace, Konis, a pair of Metzeler...
Forum: Airheads 11-27-2013, 08:13 PM
Replies: 7,161
Views: 1,434,737
Posted By Max Headroom
Had a friend visit last weekend on his stunning,...

Had a friend visit last weekend on his stunning, freshly restored Daytona Orange R90S. It had done 150k miles with not a lot of love in recent years prior to the restoration. It now has a new pair of...
Forum: Airheads 11-18-2013, 09:44 PM
Replies: 19
Views: 2,204
Posted By Max Headroom
[QUOTE=headtube;22810603]Does anyone know if the...

[QUOTE=headtube;22810603]Does anyone know if the sleeve that fits inside the needle bearing contains the lip that broke, or is the lip part of the original casting? Thanks.

It's part of the...
Forum: Airheads 11-17-2013, 10:16 PM
Replies: 38
Views: 2,427
Posted By Max Headroom
Gidday HW :wave Yeah, I half-expected the...

Gidday HW :wave

Yeah, I half-expected the same. thing but there's no pulsing at all. I should admit that I took a light skim off the face of the alloy carrier where the disc is mounted. I have...
Forum: Airheads 11-17-2013, 06:32 PM
Replies: 38
Views: 2,427
Posted By Max Headroom
Surprisingly no, the Grimecas are both on the...

Surprisingly no, the Grimecas are both on the shelf, in disgrace and still firmly attached to their alloy carriers. I used a similar method for attaching the cast iron discs as Grimeca do though. I...
Forum: Airheads 11-17-2013, 05:55 PM
Replies: 38
Views: 2,427
Posted By Max Headroom
Mate, you're over-thinking this. I have two...

Mate, you're over-thinking this.

I have two lathes at home. The first photo shows the lathe which i used to machine the discs. I have a three-jaw chuck, a four-jaw, and a face-plate for this...
Forum: Airheads 11-16-2013, 09:45 PM
Replies: 38
Views: 2,427
Posted By Max Headroom
Um, not sure what you mean by "the hard part",...

Um, not sure what you mean by "the hard part", but here's how i did it. Be grateful that I took as many photos as I did! As an aside, it would be cool to have a lathe big enough to machine both sides...
Forum: Airheads 11-16-2013, 03:31 PM
Replies: 38
Views: 2,427
Posted By Max Headroom
I had to remove the disc from the lathe chuck and...

I had to remove the disc from the lathe chuck and remount it the other way round. As I said above, my lathe is ancient and a bit limited in its capabilities, but by being creative, and with careful...
Forum: Airheads 11-16-2013, 02:13 AM
Replies: 38
Views: 2,427
Posted By Max Headroom
Sure. : Here's the car disc in my ancient...

Sure.
:
Here's the car disc in my ancient lathe, doing some initial cuts:

http://i55.photobucket.com/albums/g124/r90s_2006/BMW%20R90S%20project/df567597.jpg...
Forum: Airheads 11-15-2013, 12:34 PM
Replies: 38
Views: 2,427
Posted By Max Headroom
+2 for Ferodo Platinums. I will admit that...

+2 for Ferodo Platinums.

I will admit that I'm running them together with a pair of cast iron discs, which came off a dismantled car and which I machined to suit my 90S. Been on the bike for...
Forum: Airheads 10-29-2013, 08:02 PM
Replies: 23
Views: 2,087
Posted By Max Headroom
Pfft. There was an R90S for sale in NZ about...

Pfft.

There was an R90S for sale in NZ about a year ago with only 260km from new. Looked factory-fresh in the photos too. Never heard whether it sold or not.
Forum: Airheads 09-20-2013, 04:49 PM
Replies: 12
Views: 998
Posted By Max Headroom
It's fun to use! I thought I had a reasonably...

It's fun to use! I thought I had a reasonably good ear for tuning carbs, but the Harmoniser disagrees :rofl My bike has never run so smooth.

Have you still got my contact details? I'll PM you.
Forum: Airheads 09-20-2013, 02:51 PM
Replies: 12
Views: 998
Posted By Max Headroom
My offer still stands . . .:wave

My offer still stands . . .:wave
Forum: Airheads 08-10-2013, 09:58 PM
Replies: 162
Views: 59,709
Posted By Max Headroom
Hi Rudi, this is all I got at that link: ...

Hi Rudi,

this is all I got at that link:

"Information
You do not have permission to download this attachment."
Forum: Airheads 08-04-2013, 11:10 PM
Replies: 16
Views: 1,615
Posted By Max Headroom
It was a great day yesterday in so many ways. It...

It was a great day yesterday in so many ways. It was my first solo race day (other than a recent race meeting at a different track piloting a Honda powered sidecar with my wife bravely riding as...
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