BARE BONES MACHINE^Ž

Single Cylinder Specialists
Race Bikes From Jay's Shop...

Bare Bones is a unique enterprise... We specialize in the modification of single cylinder engines primarily from Rotax and Honda... Our extensive experience has allowed success in a wide variety of single cylinder applications... Including, motocross, flat track, ice race, road race and micro-sprint cars. In addition to the basics we offer exotic engine mods... Eliminate the transmission and put the output on the opposite side...? No problem... Put twin down-draught carbs where one horizontal item had been... Done monthly... Billet fabrications, custom machining, Tig welding and creative solutions to difficult problems are my specialties...! Our unique designs have won from Sears Point and Willow Springs to Daytona and Road Atlanta... Up on Pikes Peak down to the Chili-Bowl... On the pavement in the dirt or out on the ice... There are unique problems presented by each of these venues and each customer... We are small enough and experienced enough to approach each on an individual basis... There is nothing available off the shelf... Other than Bridgestone Tires... Megacycle Cams... and Wiseco Pistons... Everything else is a prototype... If this is what you need then contact me... Over thirty years of the wierd and unusual. I may well have already been there and done that... Jay Wright

Building A BBM TZ:

The TZ based thumpers for which we have become known... displace from 350cc to over 700cc... We have developed these things well beyond the "junkyard-dog" status that is typical of most "engine-swaps"... This is not an all-thread and wing-nut installation... I don't try to attach the head steady to the coil mounts... All the unessential mounts and bracketry are removed with surgical precision... Well designed "hard-points" are added to the chassis... The Rotax powered units require bonded, captive, rubber, isolation incorporated into these mounts... This is partially necessitated by the swing-arm pivoting in the engine cases... And partially by the intense nature of these engines... The Hondas mount separately and are smooth enough to live without this extra expense...
Dry-sump oiling systems require an oil tank that is immune to surge... and a system designed to eliminate the air from the scavenged oil... This along with divisions that prevent the hot, recently returned, oil from being immediatly sent back to the engine are some of the features of our designs...
Stainless exhaust systems are so superior in both looks and performance over time that there is little to recommend the old rusty stuff other than as an inexpensive development tool... A carbon pipe that works well initially will loose top-end (maybe gain at the bottom) as the effective diameters shrink with the texture of the accumulating rust... Stainless is forever...

"Clubman Special"

This engine has been built in a couple different configurations. We are using this setup in our MRA race bike and it displaces 675cc with an 81mm stroke and 103mm piston (Currently, Jay is developing a 701cc model). It is very reliable (relative to the water pumper) and a little bit simpler to maintain. With the downdraft head, Ti oversize valves and adjustable cam timing it is a race winning combination. In 500cc form this race engine features twin 35mm carbs uses a short stroke crankshaft from a 350 along with piston & cylinder from a 600. This setup won the Supermono II race at Daytona in '99.

BBM 680 Water Cooled Racer:
Supermono 1

The 675cc SuperMono (SOS F1) bike combines a twin-cam, water cooled Rotax engine and GP-winning chassis into a front-row singles racer. This machine captured the 1995 national championship (Jason Weir) and finished second in '96 and '97. In the 1997 Daytona SuperMono race, guest rider Aaron Turner passed the entire field (including Alan Cathcart and Michael Barnes) for the lead on the very first lap. High Maintenance: This thing is a rolling hand grenade...( For Industrial Use Only!)

675cc 4-stroke Rotax Single
103mm bore / 81mm stroke
Titanium valves
9,500 RPM red-line
6-speed close-ratio transmission
Belt-driven, twin-cam, water cooled head
3 spark plugs
Two 41mm Kehin carburetors
Bare Bones racing exhaust system
Extensively modified 1990 TZ250 chassis
5.5" rear wheel / 3.5" front wheel
Bridgestone slicks
255 lbs

BBM 680 Air Cooled Racer:
Supermono 1

Air cooled entry for the Supermono class uses a 675cc Rotax engine (Soon to be converted to 701cc). On this motorcycle, our modified twin-port, down-draft air cooled head provides a simpler and less expensive alternative to the water cooled twin-cam engine. The installation is slightly less complex; lacking the radiator, 2 of the ignition coils and additional frame modifications required to fit the twin-cam engine. This model has proven to be the best compromise between power and reliability. We have also built single carb versions as well. The bike below (#138) (Craig Wright) won the 1999 MRA Lt. Wt. Superbike and Formula Colorado class championships... (See above pictures)

675cc 4-stroke Rotax Single
Titanium valves
102mm bore / 81mm stroke
9,000 RPM red-line
6-Speed close-ratio transmission
Belt-driven, single-cam, twin-port, down-draft, air cooled head
Twin, 35mm Kehin carburetors
Bare Bones racing exhaust system
Heavily modified 1990 TZ250 chassis
5.5" rear wheel / 3.75" front wheel
Bridgestone slicks
Lockhart Phillips Windscreens
248 lbs

BBM 500 Water Cooled Racer :
Supermono II

Our 500cc entry is a de-stroked 605 Rotax. The short-stroke crank (70mm) from a 350cc engine with the large bore (97mm) produces a 500cc single with a 10,000 RPM red-line. Water cooling, 3 spark plugs, Carrillo rod, a rev-happy engine, a proven road race chassis, Galfer Brakes and Bridgestone tires complete the package. This combination won the 1995, 1996 and 1997 SuperMono F2 national champion.

519cc 4-stroke Rotax Single
Titanium valves
97mm bore / 70mm stroke
10,000 RPM red-line
6-Speed close-ratio transmission
Belt-driven, twin-cam, water cooled head
3 spark plugs
44mm Mikuni
Bare Bones stainless racing exhaust system
Heavily modified 1988 TZ250 chassis
5.25" rear wheel / 3.75" front wheel
Bridgestone slicks
255 lbs

BBM 660 Air Cooled Racer:
Supermono 2

Essentially the same as above with air cooled Rotax. This bike has has seen duty as a 500cc, 600cc, and currently being converted to 660cc. Has NSR 250 front end and PM wheels...

500-660cc Rotax
9500-8500 RPM redline
6 speed xmsn
44mm Mikuni
BBM Pipe
Modified 1990 TZ Chassis
PM wheel(s) 3.5 / 5.25
Bridgestone Slicks
248 lbs

We're your source for trick stuff... Like Ti valves and high compression pistons for custom installations. Give Jay a call and he will get you going in the right direction. Get the BBM advantage!

BBM 350 Air Cooled Racer:
SuperMono 3

The 350cc Rotax engine utilizes our heavily modified head featuring a custom Bare Bones down-draft intake system and titanium valves for maximum horsepower. The first day on the track (the rider on a GP chassis and slicks for the his very first time), the new 350 won the SOS F3 race at Daytona! Mike Gonteski followed this up by becoming the 1997 and 1998 AHRMA SOS F3 national champion

350cc 4-stroke Rotax Single
Titanium valves
80mm bore / 70mm stroke
10,000 RPM red-line
6-Speed close-ratio transmission
Belt-driven, single-cam, down-draft, air cooled head
41mm Kehin down-draft carburetor
Bare Bones stainless racing exhaust system
Heavily modified TZ250 chassis (1988/1989)
4.5" rear wheel / 3.5" front wheel
Bridgestone slicks
248 lbs

BBM 628 Honda Powered Racer:
SuperMono 1

One of the first Bare Bones road racers; this bike combines a 628cc Honda RFVC engine with a proven TZ250 chassis and is a solid, sorted and very fast effort. Ports and intakes modified to accept 37mm Kehiens. This is your "biggest bang for the buck" choice of BBM racers...

Jason Weir won the 1994 AFM Formula Singles championship in 1994 and used this bike several times during the 1995 national championship series.

628cc 4-stroke Honda Single
HRC Piston
8500 RPM red-line
101mm bore / 80mm stroke
5-Speed transmission
Twin 37mm Kehin carburetors
Bare Bones racing exhaust system
Modified 1988 TZ250 chassis
4.5" read wheel / 3.5" front wheel
Bridgestone slicks
245 lbs

BBM 500 Honda Powered Racer:
Supermono II

This bike combines a 500cc Honda Ascot single with a TZ250 chassis for leading performance and handling. Mark Hatten piloted this combination to the 1998 and 1999 AHRMA SuperMono II championships.

500cc 4-stroke Honda Ascot Single
89mm bore / 80mm stroke
8500 RPM red-line
5-Speed transmission
44mm Mikuni carburetor
Bare Bones racing 'high mount' exhaust system
Heavily modified 1989 TZ250 chassis
1990 TZ250 forks
5.5" rear wheel / 3.5" front wheel
Bridgestone slicks
250 lbs

BBM 660 Can-Am Supermotard RR

This bike started as an 82' Can-Am Sonic (560cc). Certainly a hybid of the highest order (see specs). The bike works really well at short tracks but gets a little flexy on the higher speed stuff. In its element it is a really fun, comfortable, and easy to ride machine. With its long swing arm, this thing is the hole-shot king... BBM can adapt most any component to your singles racer. Jay has modfied countless SRX's, Ascot's, SR 500's, ATK's, Husabergs, KTM's, etc...