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#645050 - 03/20/16 5:10 pm Re: B31 "clubman" [Re: Andy Higham]  
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chaterlea25 Online content
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Cork Ireland
Hi Andy,
Is any provision made for adjusting the tension on the 3/8th chain?
I dont like the thoughts of that little chain thrashing around
when the engine is on full throttle eek

If the engine spits back is there any shear pin or similar built in to prevent damage to the drive?

Regards
John

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#645051 - 03/20/16 5:19 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
I have not made provision for adjustment of the 3/8" chain, If it needs it I will.
As for the engine spitting back, the starter drive has the engine shock absorber between it and the crank. The starting procedure will involve spinning the engine up with the valve lifter.


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#645896 - 03/26/16 11:06 pm Re: B31 "clubman" [Re: Andy Higham]  
Joined: Oct 2009
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Bodger Offline
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Santa Barbara, Cal.
Hi Andy, thanks for the Robinson brake link.

I remember when they came out, no one was making anything at the time, the wreckers still had cool Japanese drums..and the Manxes and G50s were just starting to be replicated slowly slowly, part by part.

They are charging a pretty nice price, I was just looking at the Molnar Manx brakes..and in Magnesium the last Manx brake, the 4LS is over 2k pounds!!...eek!
I actually had both the Manx 2LS and 4 LS...the 2LS was a good brake, many a Manx still has them, pull hard: stop fast.

The Manx 4LS however:..pull hard-'HOLY CARP!!!...that could have gone wrong!'..just the thing for 120mph stoppies maybe.

.......

Then I also saw that Phil Pearson lists a 2LS plate for the 190mm GS front brake!!!...

Eddie Dow used to sell a 2LS plate for the 190mm brake, he called it the Duetto.

I can't say for sure they also fit the !-5/8" and very late 1-3/4" single sided BSA A and B series front brakes..worth an email to Phil Pearson, he hasn't answered yet (since I emailed him 20 minutes ago, haha)

I think the Pearson 2LS 190mm front brake complete was about the same as the Robinson brake price wise, and probably several pounds heavier.
If I recall the Robinson was the brake used on the very first G50 replicas.

There was also a 4LS plate to fit the Norton drums.


Anyway, good choices all.

Keep up the good work!

#645910 - 03/27/16 4:00 am Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
The Pearson brake is just the plate and shoes, no drum! He does them for the 190mm drum and the narrow 8" single sided drum


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#645920 - 03/27/16 5:09 am Re: B31 "clubman" [Re: Andy Higham]  
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Bodger Offline
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Santa Barbara, Cal.
Wha?!!!... Ah carp, you're right of course, me olde eyes and speed reading.....

yes, (answering my now dumb question am I) these are for the copiously available 8" single sided brake (Yay!) as well as the rarer 190mm drum..

I still dunno if this is the Duetto Eddie Dow pattern part yet...maybe.

Quote:
190mm
T.L.S Brake Plate Complete
675.00
8 T.L.S
Brake Plate Complete
Gold Star
635.00


So your Robinson 4LS brake price is really a good deal then..way to go!..

...or stop as it were.
Assuming those are new as it doesn't say 'used' I think.. even a good price used.

#646750 - 04/01/16 4:05 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
Yesterday evening I spent a couple of hours with a DTI, A degree disc and a pen and paper. I have timed the cams to BSA 350 gold star figures:- 100 Deg inlet and 102.5 Deg exhaust.
This was so easy to do with the head off and the DTI directly on the tappets. While I had the degree disc on I set the static ignition timing to 38 Deg.
I just need to make a peg spanner to tighten the locking rings on the ABSAF vernier cams


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#647905 - 04/09/16 3:54 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
I got my wheels back from the wheel builder. (Jeff at KB Wheels).
He did a great job as usual, Akront flangeless alloy rims WM2 x 19 front WM3 x 19 rear, stainless butted spokes and stainless nipples.
However the rear needed re-building again, the offset was copied off the old wheel (which was wrong). The rim needed moving 7mm to the left so another 20 spokes needed making.
The wheels are now in shod with Avon AM26 325 X 19 front 100/90 x 19 rear

Last edited by Andy Higham; 04/09/16 3:56 pm.

1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#650366 - 04/27/16 1:00 pm Re: B31 "clubman" [Re: Andy Higham]  
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england
Any news on your build Andy ?
Need a fix laugh

#650381 - 04/27/16 2:13 pm Re: B31 "clubman" [Re: Andy Higham]  
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Elko, Nevada USA
Andy .. You've mentioned your vernier cams and that brings to mind an issue I had with one of my Phil Pearson vernier cams a few years ago. As you've mentioned after setting the cam timing I snugged up the locking nut on the cams. All seemed ok but then I noticed one of the cam was still loose. Yikes. The threads had 'bottomed' before the assembly was tightened. I bit of work with a file fixed it up and averted a potential disaster.

BTW .. After installing the vernier cams I had something new to fiddle with. aargh. I made a large steel plate to bolt to the top of the pushrod tunnel to support the magnetic base dial indicator. This allowed me to check and set cam timing off the rocker arms without disassembling the engine. After a lot of fiddling around I was able to discover the Goldie engineers knew more about cams then myself. heh. I ended up setting the cams to the factory 42 and 46 specs for best performance running up my 'dyno hill'.

Something I've long time wondered about is the different cam timing between the 350 and 500 GSs. I and others have tried the 350 GS combo of the 10 degree advance pinion with a 1891 exhaust cam. But it has always been unsuccessful power band wise. Why? Considering both the 350 and 500 engines have the same stroke it would seem they would like the same cam timing.

But .. a story for you. A few years ago a GSr in OZ complained his 350 wasn't running well and he wanted a 1891 exhaust cam and 10 degree advance pinion vs his 42 and 46 setup. So we made a deal and I sent him the pieces he wanted. He later reported back that his 350 was now running sweet. hmmm.


dave - NV
#650387 - 04/27/16 2:45 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
GS Dave, A bit busy with work at moment so slow progress.
Dave NV The main beauty of vernier cans is the ability to get the timing right, not as near as manufacturing tolerances allow


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#666553 - 09/05/16 9:24 am Re: B31 "clubman" [Re: Andy Higham]  
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GS DAVE Offline
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england
Any progress Andy ?

#668051 - 09/18/16 2:15 pm Re: B31 "clubman" [Re: Andy Higham]  
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Comox BC Canada
Dave NV. I would think that it is to do with the bore/stroke ratio of the two engines. The 500 with it's 85:88 bore stroke ratio is almost a 'square' engine where as the 71:88 ratio of the 350 makes it more of a long stroke engine. I am not an engineer but I am sure the flow through the ports would not be the same. As you change the ratio, the characteristics of the engine would certainly change.

Gordo


Without frequent roadside repairs there is no fun in riding!
#679203 - 12/29/16 3:15 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
I manages a little work on the B31 this week.
Yesterday I painted the head with PJ1 black. Today I installed the valves and springs, fitted the rockers and temporarily fitted the head on the engine. I made a set of "hybrid" push rods, The bottom collars are Gold Star to mate up with the Goldie cam followers. The top collars are B31 to mate up with the B31 rockers. The rods themselves are 10mm aluminium rod from B&Q turned down to a touch under 3/8" at the ends, this was so I could pull the collars off easily to adjust the rod length. After the correct length is determined I will make the rods out of 3/8" 6061-T6 alloy.


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#681312 - 01/14/17 4:34 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
The pushrods are now finished and the head is on tappets set to 0.006"
After work this afternoon I stuck a chunk of 2" aluminium bar in the lathe and made these


They fit in the ammeter hole and allow me to fit an ignition switch





The red thing is a plastic lid of an aerosol can, it keeps all the terminals on the light switch nicely insulated


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#681388 - 01/15/17 6:33 am Re: B31 "clubman" [Re: Andy Higham]  
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GS DAVE Offline
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england
Looking good Andy, glad it's progressing..

#681450 - 01/15/17 3:03 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
The "To do" list is getting smaller
Fit rocker and tappet covers
Fit timing cover
Make the slotted mag nut for tacho drive. I've ordered a M8 x 1mm tap today
Fit head steady
Assemble front forks when slider comes back from powder coaters
Make front brake cables
Rocker oil feed
Crankcase breather
All fluids, I will be using semi or full synth 20/50 in the engine, Silkoline light gear oil in gearbox and ATF in the clutch case
Then after strobe timing fit clutch cover

Belt and braces, I fitted a tab washer and loctite to the clutch nut, the same will be done on the crank shock absorber nut.

I am expecting my 4 gallon alloy tank from Holtworks very soon

According to the parts list the rocker feed banjo bolts have different sized holes, mine are both the same. What are the correct hole sizes?


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#681467 - 01/15/17 4:56 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
T'other day I went to see long time gold star racing legend John Cronshaw. I bought a nikasil DBD34 barrel off him. It will be going on the engine next winter, after I have achieved 100MPH from the iron engine


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#681529 - 01/16/17 5:51 am Re: B31 "clubman" [Re: Andy Higham]  
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GS DAVE Offline
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england
The banjo bolt with the larger hole fits in the exhaust rocker..

#681530 - 01/16/17 6:15 am Re: B31 "clubman" [Re: GS DAVE]  
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Bolton Lancs UK
Yes I know that, mine are both the same, less than 1mm hole. I am assuming they are both inlet bolts I need to know the correct size hole for the exhaust bolt


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#681568 - 01/16/17 3:00 pm Re: B31 "clubman" [Re: Andy Higham]  
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GS DAVE Offline
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england
Oops sorry Andy misread your post, rushing to get back on my job at work.
If nobody has informed you by tomorrow night I will pull mine out and measure them tomorrow evening..

#681689 - 01/17/17 4:34 pm Re: B31 "clubman" [Re: Andy Higham]  
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Bolton Lancs UK
I've just about had it up to here with the front forks!!
I have a set of Kommando's cartridge dampers, I bought a pair of A65 bottoms with the holes in the bottom to secure the dampers. After I got them back from the powder coaters I realised that theRH bottom had been badly bored at some point and had about 2mm of clearance between the slider and bushes, it was also like a ploughed field.
I saw another RH bottom on eBay so I hit buy it now, then I realised it was in USA and there was a stack of postage charge. Oh well it will be ok I thought, then another hefty charge for import duty F*!!k.
I tested the fit of the bushes and it felt ok so off to the powder coaters it went last week. This evening I decided to assemble the LH leg, the fork bottom must have been twatted hard at some point at it jams half way GRRRRRRRR


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#681704 - 01/17/17 7:42 pm Re: B31 "clubman" [Re: Andy Higham]  
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Triless Online content
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OZ
Andy, as I understood it years ago with my ZB 33, the rocker feed bolts both had the same holes, and two with bigger holes were for the head to crankcase drain.

#681741 - 01/18/17 8:03 am Re: B31 "clubman" [Re: Andy Higham]  
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Peter R Online content
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Netherlands
Originally Posted By Andy Higham
Yes I know that, mine are both the same, less than 1mm hole. I am assuming they are both inlet bolts I need to know the correct size hole for the exhaust bolt

Andy, I measured the hole in an exhaust feed bolt that I have in my workshop, and it measured 2.4mm.


Peter.
1974 Commando 850
1972 Trident T150T
1961 Goldie DBD34
1969 Benelli 250 sport special
#681744 - 01/18/17 8:34 am Re: B31 "clubman" [Re: Peter R]  
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Bolton Lancs UK
Cheers, I can drill it out now


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#681747 - 01/18/17 9:34 am Re: B31 "clubman" [Re: Andy Higham]  
Joined: Dec 2004
Posts: 8,896
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Scotland
On the fork lower the first check is to see if its bent or a narrowing. Leave the top bush out and put the stanchion with the bottom bush into the lower and see if it reaches the bottom, if it does then the lower is bent, if it jams then it needs boring out in some way, I rum a 38mm reamer down Triumph lowers, need a 37.2mm reamer to do a BSA. There is possibly another route, I will post details later with pics.

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