Latest from Performance Indian

" I just finished a motor for Matt Blake last night. It is a 648 "Big Base" 58" Stroker. It has all the best stuff in it. I used S&S 58" wheels, and Carrillo rods. I had light Arias "Tall Dome" pistons made with .180" pop-up. It has Enfield Racing's reproduction cylinders, that I ported. It has my racing lifters, and hi-lift cams. It has my new 36mm Mikuni setup that is perfectly suited for this motor. It has some original 648 parts, and alot of NOS parts. It's gonna be a screamer! I am just now putting my Twin-Scout motors back together now, after doing some mods, and clearance changes. It will be a much faster bike this year at the Bonneville "Speed Week" meet. I'll keep you posted. See Ya; Jim Mosher."

741b Racer Project FS

• set of 741b crankcases in need of slight repair (can have this done for purchaser at cost)
• set of lined 741b cylinders, all fins (now) intact
• pair of serviceable 741b cylinder heads
• Chris Ireland built frame jigged from a standard 741b frame ... needs minor finishing works
• Set of engine plates
• Pair of original steel ex army 741b tanks 
• BSA B series forks and front wheel
• Choice of rear wheels
• Choice of flywheels to give 500cc, 600cc, 750cc or 830cc

 

EBAY LINK

Inside a Bob Nichols' Racing Scout

Bob's website is HERE

Pick n mix Scout

741b cases, Chris Ireland built 741b front frame, jigged on his old kitchen table and an Antig grasstrack tail section, frame could easily be modded to take SS cylinders to make a 45cu" class C style racer



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Scout racer tanks

From Matt Blake at Iron Horse Corral...

HERE

High on my wish list!

As fitted to Doug Young's racer

Different Strokes

Dewey's 42cu" 741b



"This engine design was of my own creation. I'd been spending countless nights going over the numbers - stroke, rod length, compression height - until I settled on this configuration. I was told I was the first to try this, but given all the builders out there I can't believe someone didn't beat me to it. Anyway, it has the 45" Scout flywheels & rods, and HD 45 stroker pistons from T&O. The pistons are ok, but just ok. I would have liked to see a little more effort in the machining end such as a true cam ground skirt. I assembled the bottom end, installed the old 741 pistons and barrels, and measured how far they protruded above the deck. Then I compared the difference in compression heights and calculated what the rod length actually needed to be with the stroker pistons. I had Rocky relieve a little from the inside of the piston pin boss, hone out the small end to accept a thicker bushing and then offset bore the bushings to get the deck height perfect with no shimming at all. One rod was offset .029" and the other was .039". The difference reflects inaccuracies in the machining of the case. All this was intended so I didn't end up with an engine that required changes in the frame. The 741 frame is quite small so a taller engine would require a lot more work. I'm using the original cams & lifters, carburetor too. I did put in larger intake valves. I found the intakes from a Ford 200 six worked fine after turning down the head diameter and then machining the valve head thinner for a normal margin. This also lightened it. I had to relieve a bit out of the cylinder head to make room for the valve. The key groove is about 1/16" farther down the stem so all I needed was a 1/16" thick shim under the spring. The only other thing that is home grown is my exhaust system. I made the headers almost 40 years ago out of 1 1/2" pipe and fabbed up the muffler last spring. There's a few other odds & ends that I had made over the years. A sidestand, my brake pedal which was out of a Datsun 240Z originally. The front fender is a mystery. I have no idea what it came from but think it could be from a Jr. Scout. If anybody could identify it I'd like to know. It's definitely NOT 741. I have one of those in the loft.
I live in the mountains of Vermont and was always having to shift down to climb these steep grades with the original engine. That's a thing of the past now. I can zip up a 14% grade at 60+ mph and that's after stepping up the drive sprocket 4 teeth! My buddy from New Jersey came up on his Yamaha and after about 15 miles stated that I was a little hard to keep up with. Didn't hurt my feelings one bit!

Dewey"



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Putting the new works truck to work

The TT Scout fits in a treat



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Performance Indian crack record

Jim Mosher and crew are now the record holders for the AV-F 1350cc class with a speed of 148 mph the previous record was 129mph

Fire Arrow Scout mock up

741b Scout motor, Norton 4 speed box, '58 Fire Arrow frame, BSA B40 fork 4.00x18 Pirelli trials tyres on Honda K4 hubs with flanged akront rims.
Tanks are 741b Scout. 10" of ground clearance if 13" shocks are used.

Perfect for a bash at Red Marley hillclimb!






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Mid mounts for the L'il Red Rooster

Being in trackside condition, the Rooster came to me with no brakes and with staggered foitpegs. Not much use on Highland roads, or tracks!

First job was to work out how....

Its already fitted with a pair of super light A&A Racing hubs and rims, the rear has provision for a disk, so to get a UK mot I'll need to rig up two independent means of braking on thd same disk.

For the foot pegs i trimmed the Bates fold up ones off their existing mounts made up some 3/8x1" flat hangers and fitted them over the ends of a 1/2" hex rod fed through the hex hole in the engine plates that usually takes the rear footboard mount... I turned the bar round on the lathe for where it feeds through the primary.

With the clutch pedal refitted i looked to the RHS to suss out a brake pedal and try to hide a master cylinder.




Best place for it is tucked in behind the rear exhaust and mounted to the engine plate (I'll make up a little heat shield to hide and protect it). I turned down the brake side of the hex bar and made a steel sleeve to fit it, cut up an old honda brake pedal ( one that came with the Nissin master cylinder) to use the pivot end on the sleeve. And cut a flat bar to be carved in to a pedal then both can be welded to either end of the sleeve.




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Location:Church St,Fortrose,United Kingdom

Sometimes its a good to go back to an old idea

Thinking about a stroked 741b motor in a Fire Arrow frame, I mocked this up a few years back but shelved it while I got the Sport Scout finished

the powerplant needs moved back about 2" but everything lines up nicely and most of the  parts are "Indian."

Desperately Seeking Speed

Chris Ireland is at Bonneville with Bella this week... and next week, looking to break some records.

You can follow his progress here speedweek updates

Best of luck  Chris 8)

Bob Nichols Racing

New website up and running.

Bob Nichols Racing

Class C 45

Arrived at the Speedshop this week, '37 Bonneville Scout in a modified 1950 Warrior TT frame


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Another afternoon fettlin in the sun

Fitted a new needle and dashpot damper to the SU, still running too lean, i think the pancake air filter isn't really helpimg matters!
Thinking of fitting a more restrictive air intake




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Testing

In for the night

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All together again....

Fuelled, oiled and ready to rumble..... but ive been too busy in the shop today to get it going!!!















I did get a chance to make up a cut down spark plug key using my cut down 1/2" af cylinder base nut spanner and an old plug socket

Location:Sunny Achnasheen

Back on its wheels

Just a few odd jobs to do then i can fill up the tanks and get the motor recommissioned




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Forkin about

Stripped the front end to make up new fork stop and decided the top yoke could lose a bit of weight











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Nearly there

Heads on, tanks on, waiting for a couple of packages of small parts for the carb and a pipe bender so i can tidy up the oil and fuel lines and it should be ready to fire up 8)





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The latest from Tony and crew

At Indian Trading, this little 101 wall style bike is going to be a cracker!









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Location:A862,Inverness,United Kingdom

Next in the queue for some attention

The SU carb, was an experiment that worked out quite well, a reconditioned HS2 1.25" carb originally set up for a Morris Minor 1000 car. It hasnt been changed from the Morris setup, I'm sure the carburation can be improved considerably, so I have been doing some homework!

Final drive ratios

While i have the scout on the lift, i decided to take note of some figures, to gelp get the best out of the stroker motor. I know that these figures will give me only theoretical top speeds etc but its good to know what gearing changes will do to your rev/speed ratio once you are on the road.
First off, with the cylinders fitted set the rear piston to tdc and put a chalk mark on the rear tyre, selected 1st gear and rotated the wheel for one full revolution of the crank... measured the distance travelled, same again for 2nd and top gear.






The Scout is fitted with a 24t gearbox/trans sprocket and a BSA qd rear wheel with a 49t sprocket giving a final drive ratio of 2.04:1

The BSA hub won't give me much scope for sprocket changes, so I'm thinking of changing to a Honda CB72e rear hub, with the advantage of a TLS rear brake, to let me try a range of sprocket sizes.... I reckon an FDR of 1.5:1 should work with the motor without losing too much acceleration