B44 gearbox in a B40FE

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280mark
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B44 gearbox in a B40FE

Post by 280mark »

Hi, new member here, I've trolled thru the search data base but I can't seem to find a definite answer. I've a B40FE I'm building into a scrambler/mxer, I know it's not the optimal set up for a racer but it's what I have to work with to fit into a spec class. What modifications do I need to do to put the B44 gearbox in the B40FE, I've already replaced the layshaft bush with the B44 type needle roller, is there anything else or is it a bolt in. I've not got the gearbox yet,but there seems to be plenty on ebay. Thanks, Mark.
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kommando
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Re: B44 gearbox in a B40FE

Post by kommando »

When you took the layshaft bush you will have seen it is a top hat and has an integral thrust face, as well as inserting the new needle roller you also need to replicate the top hat by cutting off the top hat or by facing the inside of the gearbox casing and adding a thrust washer.

When you fit the new gearbox internals also look to fit the modified camplate and sliding fork as fitted from 69 onwards to reduce jumping otu of 3rd.
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Re: B44 gearbox in a B40FE

Post by minetymenace »

<135 to the forum 280mark....

How about some pictures? There isn't a "Small Heath" or "Armoury Road" in Birmingham Alabama is there?
280mark
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Re: B44 gearbox in a B40FE

Post by 280mark »

No Small Heath or Armoury road, but near by there is Leeds,Chelsea,Manchester,New London, etc. Lots of folks from your neck of the woods came over here to mine coal and make steel. There is also Barbers Motorcycle museum,I'am amazed at each visit.I do have some photo's of the needle bearing install, need to see how to post them. Mark.
Photo012.jpg
Photo014.jpg
Looks like I may have figured it out! I found an extra long adjustable reamer and then turned up a pilot to fit where the kickstart quadrant would go so I could ream the hole as straight as possible.
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Re: B44 gearbox in a B40FE

Post by 280mark »

Parted off the top of the bush. Mark.
Photo117.jpg
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Re: B44 gearbox in a B40FE

Post by 280mark »

Well it’s only been 8 years since I’ve last posted, but in the mean time I’ve finally finished my 1965 B40FE Enduro Star. These things take time!
I finished it September and raced it at Barbers in the cross country race in October.
I’ve since then have been working on the suspension and I’m fortunate to have an area to ride it in the woods which I find a delight to do.
Tight woods riding is where it works best, a 9.5 piston and a small Amal makes a nice torquey woods motor. Needless to say I’m well pleased.
Many thanks to Peter Quick for super parts service.
Mark.
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koncretekid
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Re: B44 gearbox in a B40FE

Post by koncretekid »

Thanks for posting your pictures. Great looking project. I have a partially built B40 in Colorado (my second home) which had already been converted, but not yet tested. Hope to get back to it, some day!
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