ideas to build a (ocd) jackshaft to use 200series tire

[Guest]

this is my first post so bear with me please.

once I seen gs750 that a man built his own outside drive jackshaft to run a wide race tire. I want to fit a 200series with new swing arm etc... I cant find anything online about one. any ideas on constructing one? btw I have a 78 750e

[tkent02]

Going to need a really big hammer.

[GS1150Pilot]

And some heavy angle iron ...

[rapidray]

Trac Dynamics & a few others build jack shaft swing arms for Busas & you can adapt one of those. To build just ONE, you will spend a lot of time & money on fixturing & machining & it would be a lot cheaper just to buy one.
Ray.

[Busanate]

Thank you guys for your posts. my situation, which is wishful indeed. i am on my third 78 750e, my first was bone stock. i sold it for a down payment for a 2004 limited busa. you may have picked up on the screen name, busa nate as most refer to me by. my second gs i did mostly performance work to. i would rather go straight and fast when i feel like playing around rather than going fast on curves.

my top speed is 214 mph on the busa. i love the 750, light and with all roller bearing motor is my choice. my current gs about 2 weeks away from hitting the road after a complete 13 month long tear down , split the cases, and ect. i have restored it completly with only a couple minor mods and all digital cluster.

i am about to hit the road for the season.

my last gs i had at 168 mph top speed. the suspension was just plain spring swap in forks and rear. with minor bumps in pavment the bike started bunny hopping both wheels clean off the road. i am tooled and capable of fabing and modification needed for suspension swap. i am going to completly replace rear with late model gsxr 1000 swing arm, wheel, shock, brakes, etc... then the front end with a lighter gsxr 600 front end, i havnt completly decided on the front end i will use tho, yet i plan on changing the rake from stock while doing it also.

i know i can come up with somthing for a jack shaft swing arm to do this, if i am reduced to this ,then i will. but i have done alot of reading and found that the jack shaft sprockets have common failures and would rather not deal with the double chains and problematic sprockets etc.

i know how the concept of how a osd works. i would rather do it right and be more reliable also. i know i will have to engineer it out and will take some machine work. i am capable of making all of it except extending the primary shaft. i have an idea of how to do it...

my idea is to have a extension shaft machined... internal splines to slip over primary shaft kinda like the sprocket does, then the shaft reduce in size and be splined identical to splines of primary shaft to alow to install stock sprockets just as you normally would. then the end of the shaft is held in a bearing and fitted in a bearing support plate thats attached to the engine.

concept seems simple but the doing is harder and expected, yet maybe foolish, i am set on this method.

i new one older weekend drag raced with a 750 also that built his own. yet i never got details of his construction and this was a decade ago.

so i think i can continue this route of construction yet, wondered if anybody has seen one, or has any ideas on the shaft extension idea other than mine.

thanks to all