the gap on the 1*98 is 152mm, as shown, however on the M1100 its approx 175mm. The mount for the shock may also be different, which would give rise to geometry issues.
but the back of the engine is the same, id need to look at your std set up to see how its spaced and what bearings....
The way 1098 arm mounts into the frame is different to the air cooled version, as the a/c rear frame is different. When I put a monnie s4 arm up to a 999 case the engine was too narrow. The s4 also had bearings in the engine, rather than in the arm for the pivot shaft. I bet that is the case here.
I think my favourite option atm is to see whether a 1098 eccentric hub can be machining down by 3.5mm radius to fit the 1100 s/arm. I can then use a 'large' axle assembly, with corresponding rotor/sprocket,cush drive,etc. Not cheap but struggling to see what the alternatives are. Can't see how an 'adapter' would work without off-setting the wheel from central alignment....
Malcom. Are the locating pins for the wheels the same pitch? If so as mentioned it would be possible to sleeve the wheel shaft along with a new tapered washer. Are the hubs and shafts the same width? The small hub might be able to machined out to fit larger bearings for the larger bearings to fit 1098 spindle. There are many ways to skin this cat. See crankers thread about his hub conversion.
The location of the pins would require them to overlap the outer rim of the current locating 'plate', and I think the pitch may be different also. I read crankers thread, but he had the opposite issue, ie a small hub going into a 'large' s/arm. Do you think it would be more achievable to machine out the small hub, or reduce the OD of the larger hub?
good idea, but I have a 'small' hub s/arm, the big hub s/arm won't fit. I need a big axle to fit the small hub (by machining out the hub), or a big axle to fit a big hub which has been machined down from 112mm OD to 105mm.
sorry,may have misunderstood, I thought crankers config was small hub with small axle into large s/arm? @cranker, how did you get the small hub/large axle combo?
ok, an update. FE very kindly tried to 'skim' a 1098 hub down by 3.5mm, but it appears that there's not enough 'meat' accross the width to handle this, so thats effectively dead in the water If anyone has any bright ideas at this stage (other than buy the correct wheel!), I'd be more than happy to listen?
I'd consider a sleeve on the shaft. The conical washer thats under the main bolt, I'd make one that had an integral cylindrical sleeve on it to take up the difference.
sorry, do you mean using existing axle, with a sleeve/conical washer to cater for the larger wheel aperture? That would allow the wheel to sit on the axle ok, but I still have an issue with the locating pins not aligning with the wheel-hub locating sockets. Relocating the pins would be extremely tricky, as the axle/plate I;m told are high-tensile steel....
No, I'd turn a conical with the sleeve as one piece. Right, the locating pins are an issue too. Youve got youre work cut out for you. Can BST not convert the wheel hubs for you? As the centre is an alu piece bolted on itsnt it?
ah, ok, yes, conical with sleeve as one piece makes sense. Yes, locating pins seem to be the biggest issue, I did contact BST who predictably responded by saying that it wasn't possible to replace the wheel-hub, & I needed to buy a wheel with the correct fitment.....
