PICTURE OF YOUR BIKE/BIKES

[KenHawk]

Finally, heres a couple of photos of the bike as it stands today!






At HWY-! and the Pacific Ocean near home:



This shot was on News TV in Oregon!

[Ross]

Just took this photo of my LT.

[SteveD]

Hi Ken.
Tell us about these sjbmw (?) rocker covers?

[00weel]

Altho I sold this bike awhile back it was one of my favorites.

[SuperDave]

Clicky on the picky...

[KenHawk]

Hi Ken.
Tell us about these sjbmw (?) rocker covers?

Well there really isn't very much to say about em...

What they are is Vintage, circa 1980, CC Products "Cool Covers". The castings are heavier than the BMW covers, which makes them somewhat quieter and they're supposed to dissipate heat better. The thing that I like about em is that instead of using gaskets, they're grooved for O-rings, and that allow for metal-to-metal contact which helps cool the heads, plus they don't leak oil. Not even a drop! They came powder coated stock and they sold for $129.95 back in 1989.

I bought these three or four years ago, from a guy with a huge parts stash and thankfully didn't have to pay through the nose for em. These days I'd expect to pay $250 to maybe even $300 for a mint set. If I could find another set, I'd buy em and put em away.

[Sam LP]

This is my bike, already listed in Pictures as R90/6 Project

I have owned it since 1993 and have been constantly messing with it whilst riding it too. After an accident in 2006 it was taken off the road to sort out some problems and then it got sidelined due to the usual reasons - new baby, renovating a old apartment, lack of time and money. I have been working on it since this spring and hope to have it on the road for the beginning of next year.

It has the usual engine modifications as listed below, plus a system which I have been working on to deal with the oil thrown out of the breather at high rpms (8200+). this system is based on Udo Gietl's solution for this and on information from the eurospares forum. This would not have been necessary if I had listened to Jim Cray, the engine tuner that re-built my engine. He said that there would be problems with crankcase pressure with an early R90/6 crankcase and that we should use a post '81 crankcase. I didn't listen, as I like the earlier timing cover, hence have had problems with oil coming out of the breather and leaking base gaskets.

Crankcase breather tank. This involves removing the reed valve from the engine block and plumbing a large bore hose to an extra "tank" with two chambers, it is 75% complete:
Chamber 1 which is at a low vacuum (crankcase pressure) to increase crankcase volume. Chamber 1 will have in it a sort of labyrinth, foam or mesh to catch the oil thrown out of the breather, this can then return to the sump via a drain line. Chamber 1 vents into chamber 2 via a 2 stroke reed valve block (six reeds: Roughly six times the area of the standard reed mounted on the engine block).
Chamber 2 is at atmospheric pressure, also has a return line to the sump (which enters below the oil level) and will have a flat panel filter in the lid.
A separate line will run from chamber 1 to the exhaust header to create an exhaust sucker. This will have a regulating/off valve and an inline reed valve to ensure one way flow.

Specifications
Chassis
R65 swing arm and subframe
/7 seat shortened to fit /7 police tank and R65 subframe.
K100RS 1992 forks, adjusted pre-load and oil weight
R1100s floating discs and calipers: under tank master cylinder.
(Jon Lars asked me for information on this front end for his GS cafe racer)
Koni dial a ride rear shocks
Clip on handlebars

Engine and drive
Engine blueprinted and balanced
post '81 crank,clutch and gearbox
336 cam
40mm dellorto phm's
Heads ported and flowed
Waisted (stellite?) valves from CC products 44mm intake, 40mm exhaust.
R90s pistons, valve pockets relieved, twin plug heads skimmed for 10.2:1 compression
Dyna coils, boyer ignition
40mm exhaust ports
SS Exhaust headers 40mm OD to 42mm OD
SS Silencers based on Jim Cray's design for Keihan (need to be glass packed and assembled)
Battery mounted under gearbox.( I am on the third attempt of the battery box, space is tight)


Here is an earlier incarnation of this bike when I was more into the cafe racer look. The seat was ratchet strapped on and had a plywood base with 1/2" foam cushioning.

[Airbear]

Welcome aboard, Sam. That's quite a bike you've got there. 8200+ rpm - sheesh!
Just out of interest, where will you fit the breather tank you describe?

I'll bet you are glad about transcending the plywood seat look. Lovely looking cafe, though.

[Sam LP]

Thanks for your comments Airbear

The plywood seat was uncomfortable to say the least.

The oil/breather tank is in the top picture under the seat (this is why I am relocating the battery). It is made from 3mm aluminum sheet with radiused corners and uses Goodridge type fittings for the return lines. You can also see in the picture a Goodridge fitting coming out the back of the sump spacer.

I haven't found a good filter for the lid yet, I'm looking for something flat and about 8cm square. I was thinking about cutting it out of one of the type used in cooker hood/extractors, but I would prefer to find something ready made with a silicone edge to make a good seal.
Cheers
Sam

[Airbear]

Thanks Sam. A good project you are doing.
I guess you've checked out filters for chainsaws, lawn mowers, lawn trimmers and so on. Something somewhere will just fall into place, I'm sure. Good luck with it.