From an early /2 thru R1200 series and K bikes we are able to update and repair your transmission. We can check and rebuild your transmission, update internal components, and undercut gears in M series transmissions. We use only top quality NTN, Koyo, or Timken Bearings. We also solve known problems by modifying or changing a bearing or transmission case thus creating a reliable transmission. We offer a core exchange for some transmissions. Don't be fooled by a cheap rebuild. We sometimes have rebuilt "Bombar's Beemers" transmissions for sale. We carry 5 speed airhead and both R1100/1150/K bike transmissions that are complete. Price will vary. Please call.
AIRHEAD TRANSMISSIONS
Rebuilt 1970 - 1995 series - New bearings, seals, new gasket, pawl springs, and reshimed. 
I also rebuild the output shaft and the helical 5th gear and 3rd gear where I re-cut these gears with a special race cut thus eliminating the typical problem of gear slip and breakage.
$595 - $995
OILHEAD TRANSMISSIONS
What exactly is undercutting the R1100 Transmission gears? And why do it?
Notice the circled area in the photo. 
The dogs have angles machined into them where they meet. Since the mating surfaces are beveled, they become interlocked while under load, unable to separate without first backing up to unload the angled surfaces. In contrast, gears that are not undercut can more easily unload and slip. Typically this causes 3rd gear to disengage on the R1100. The procedure to create the angled surfaces is known as undercutting or race cutting.
Undercutting the 2nd and 3rd, 4th and 5th gears respectively prevents the notorious shift fork wear and gear slippage that plagues R1100 "M" series transmission
"I just put the rebuilt M94 in my R1100RT and rode for 200 miles...WOW. It never shifted this well, and has smooth and positive engagement, and getting into 1st is now a breeze". EXCELLENT WORK. Peter C - Colorado
"Awesome transmission - really amazing the difference. I have done 1500 miles and this just get's better". Nick - Queensland, Australia - R1100RT
"Just a note to thank you for a job well done. My R100 has never ever ever shifted and been this solid. Rebuilding the output shaft with the re-indexed 5th gear was key...you sold me forever!!". John - R100
Bombar's Beemers Transmission Machine Shop
M94 – M96(1994-1996) Undercut 2nd, 3rd, 4th and 5th gear. Prevents fork wear and gear slipping. New shift fork, new bearings as needed, new seals, re-shimmed correctly, O-ring for neutral switch, and re-sized clip for solid shift drum gear engagement .
- OR -
M97 (1997 – 2000) Race cut 2nd gear and dog, recut 5th gear, new shift fork, new bearings as needed on output shaft, new seals, re-shimmed correctly, O-ring for neutral switch, and over-sized clip for solid shift drum gear engagement. Add $250 for oversize output bearing modification on output shaft. Allows for the installation of a tapered bearing to prevent gear/bearing wear.
Prices from $1599 with core (Core is same model complete transmission).
Rebuilds, upgrades and repairs to /2, /5,1150 Series, and K Series.
Prices upon request.
The Dreaded Spline Wear Syndrom
A number of R1100, K1200, but mostly R1150 series transmissions experience premature wear on the input splines that fit into the clutch friction plate. This creates a really bad problem and will require the removal, and replacement of the input shft and clutch plate. We have done several of these. Please call us if you are experiencing this problem to discuss repairs. Replacing the entire clutch system does seem to eliminate the issue. And PLEASE NOTE - If you are buying one of these bikes and want to keep it for a long time, consider biting the bullet, and having the splines properly greased rather than waiting for impending doom!!
Rebuilt “better-than-new” transmissions
M series for BMW R1100, Starting at $1599
Six Speed for R1150 series , Starting at $1599
5 Speed for 1975 - 1980, and 1981 -1995 BMW Airhead. Starting at $995
FINAL DRIVE
Final drives can be cleaned, resealed, rebuilt, splines rebuilt along with the wheel drive splines. /5 motorcycle splines are rebuilt to /6 standard which have a better surface and last a long time.
☼ 1970-1984 all Twin shock (double sided swing arm) BMW R50, R60, R65, R75, R80, R90, R100 models, K75/100 Final Drive/Shaft .
☼ If you send the Ring Gear Only - $229 plus shipping.
☼If you send the complete drive - From $469-$499 depending on extra parts needed to reseal/rebuild plus shipping - The drive bearing may be fine, but must be pulled from the crown bearing prior to spline repair, replaced after repair, and then the drive is cleaned, resealed, new cover gasket and reshim.
☼ Replace the drive dog on the wheel - $269 plus shipping. 
This includes the old drive dog removed, new drive dog riveted onto the wheel. The wheel is cleaned. New wheel bearings may be needed. See component pricing
K75/100 - Rebuild Final Drive with new pinion shaft spline, new drive shaft, clean and reseal. $959.95
PARALEVER Rebuilds with new crown gear bearings, reshimmed with new seals and may need rear tapered bearing. Prices
$395 - $595 with new pivot pin bearings if needed. We do a core exchange on some models - CALL!
CARBURETORS For all models including Dellorto and throttle bodied K and R 
models are cleaned and rebuilt. We also can clean and rebuild fuel rails on K bikes with new fuel injectors. We use high quality rebuilt and cleaned-tested fuel injectors with new O ring seals ready to be installed on the motorcycle. From $150 to $425. Clean to Full rebuild with parts.
WHEELS Rebuilt for your BMW with new bearings, new internal "stack" and new drive spline. From $125 - Please call for details as pricing varies a great deal
We can replace spokes, clean hubs, relace, and true. we can also repair bent rims as long as they are not too bad. Click on this link for pricing
TANKS
Can be cleaned, prepped and relined making them last a very long time. $190 - $250. We use top quality lining materials.
ELECTRICS
We can clean all starters, update electrical systems and supply you with any electrical part, electronic ignition system for the early BMW motorcycles and Omega charging systems-see our electrical page.