Honda RS750 Flattracker.

[trickytree]

Right then chaps, I am after as much info as I can get hold of about this awesome mid eighties Flat track racer. I have googled for England and have only really come up with the same few photo's and a general description.

I am going to build a "replica" so I am after as much technical info and specifications as I can get hold of.

I have the first bit of the jigsaw, a XLV750R engine. While wanting to build it as authentic as possible I realise there are going to be many inacuracies, most notably the cylinder heads. As I want this to be road legal there will be things like front brakes, mudguards and lights aswell. I am hoping that I will be able to convert to chain drive but I have a rear wheel and S/A-drive shaft just in case. (I pick up the engine at the weekend so may know more then) But I would like to get the general dimensions and shape of the bike as close as practical

So, what do I need (apart from a labotomy!), well anything really but a great start would be a photo of the bare frame and things like wheelbase, wheel/tyre sizes and steering geometry.

TIA, Paul.

[DaveS]

Wow this is very interesting......

Photo's and regular pics required!

Can't help you with the build though. But this sounds very cool.

[trickytree]

Photo's and regular pics required!
l.

Will do!

Found a little bit more info, looks like it should be possible (though not nessesarily easy?) to convert to chain drive. It looks like there is a bolt on housing that takes the shafts bevel drive......could it be as simple as just removing said housing??? Will find out this weekend hopefully!

Paul.

[Rubberchicken]

I've had a look at the difference between the AT/TA and deauville engines, and it's a bolt on housing indeed but the shaft coming out of the gearbox is different. Dunno if that goes for the XLV as well, though.

[Dilbert]

Think we had this discussion before and it turned out like above that there was some problem with the output shafts being different, bet Tarka would know he's got a nice XLV750

[trickytree]

The story so far......picked the engine up yesterday and the big problem is that the ouput shaft rotates the wrong way for chain drive

The solution? Well, according to those in the know just convert the primary drive from gear to chain. Simple

Dont expect a further progress report for a while, I'm off to get 'me spanners and a hacksaw


Paul

[Dilbert]

That would work in theory as would adding in "jockey" gear to reverse the rotation, but and it's a big but, how and where would you fit a chain, sprockets and a tensioner?

[trickytree]

That would work in theory as would adding in "jockey" gear to reverse the rotation, but and it's a big but, how and where would you fit a chain, sprockets and a tensioner?

My first thought was to use a "jockey" gear but I never really liked the idea...not very neat. I am getting a fair bit of good info from a flattrack forum in the States, which is where the chain primary solution came from. Some machining of the cases is required but I have not been given step by step instructions, just guided in the right direction, rather like the chap in the car park in the Watergate Affair film....."follow the money"!!

The first job is to ensure that the proccess is feasable, the only thing I want to make sure of is that the gearbox will work as normal running backwards, the RS has a 4 speed unit so will be differant anyway. If I get the all clear with that then I can strip the motor and have a look at the primary drive and see if I can work it out, pressumably it's "just" a case of replacing the gears with sprockets. God knows where a tentioner fits!

Paul.

[babybadger]

http://www.motorcyclemuseum.org/classics/bike.asp?id=25

Is what it looked like in 1983

You could use a primary drive from an old Bonneville, it will come out as right hand gear change though......

[trickytree]

Just a quick update. Technical info on these bikes is pretty hard to come by, I keep getting little bits and bobs now and again but I am still a few details short of being able to start hammering and welding.

I have a few tube sizes for the frame, enough to get started anyhow, and have found some photo's with tank and seat removed. The only area I am a little unsure about is how the S/A is mounted to the frame, once that is sorted I can draw up the frame and S/A and start fabricating the tubes, (after building a frame jig of course!). The swinging arm looks like it will be a PITA as it is rectangular section (2" x 1 3/4") with a gentle curve, nice!

When I am ready to start real work I will strip the engine and remove all the heavy steel gubbins from inside as I dont fancy lugging a 161lb lump in and out of a spiders web of tube.

Some more piccies http://www.jcmscycle.com/newpage11.htm

And heres a real one converted for the road http://www.hot-dock.co.jp/01story/my...-d/kgs-033.jpg.


TTFN, Paul.