saving weight is a must...rear subframe

I went to Kempton Park autojumble and found by chance a rear subframe. I have no idea yet how to fit it...got it as an impulse buy for 10quid.. but should not be a problem though adding brackets to it etc. Its all Aluminum incredibly light. Its from a Honda Xr650. I intend cutting the trx frame as the rear end is not needed and probably weighs as much as the front part....not going to be carrying any passengers.

sunday...engine out....still got to sort the exhaust out.still stuck solid, may destroy them in the process of getting them away from the cylinder head...a real pain in the back side I hate corrosion......thats why one should always keep a bike covered or clean or garaged......



 will probably go for a 2 into 1 from projection components.co.uk...nice 50mm diam pipes.

Stripping down

Im pulling the bike apart, tried out the yzf750 swingarm just to see what it looks like. Will check later for sprocket alignments. notice how im hanging the bike up. I found a problem the exhaust down pipes are stuck solid...the age old problem with when steal meets aluminum..it corrode welded together. Looking around the bike it has been kept clean in the obvious places but its where the hidden bits get left and forgotten about and if not touched will just rot. The bike has that all over. Its had several owners and I think the last owner must have had it left outside and not undercover..

how to fit a vfr750fl race shock in a trx

The vfr750f-l shock is the same length as a trx....which is very conveniant!...I spent 2 years creating my vfr racer and along the way used all sorts of bits lying around the shed. A lot of Honda parts are used in other hondas,I also want to use new parts like my nice expensive race shock from the retired vfr into the trx...saving some money...so.. I found a cbr600fh rear suspension linkage in the bottom of the picture( I bet other honda bushes are the same dimensions). The steal tube bearing bush has the same outside diametre as the trx version but a smaller inner dia... But to fit the vfr750 race shock in the trx rear suspension arm one needs to take the cbr bearing bush and put it into the trx equivalent place, This allows the bottom of the vfr shock bolt to go through and lining up correctly.If thats not clear look in the picture.trx bush and bolt above the vfr bush and bolt.

First job!....strip down.....cut off exhaust flanges as they are corroded themselves around the exhaust studs. while im figuring that out get the r1 and trx yoke stems removed and put the trx stem in the r1 bottom yoke...have to get someone to do this bit.

from vfr750fl to trx850

 

My VFR750fl project thunderbike racer is put on hold here is my new project! something else to tinker with in the shed a trx850!...inspired by a very rapid thunderbike trixie by the name of Michael Simmons of west country windings I will try and emulate from scratch. The trx is very light, can be lightened further, handling improved by an R1 front, stiffen the rear by putting a yzf750 swingarm. I have these in the waiting. I will probably lighten and balance the crank, peened rods, raise compression( bigger pistons maybe), put some FCR41 carbs, free flowing exhaust, cams re-shaped and make the crankcase breathe to help it rev easier...things Ive picked up from my tinkering with the vfr and my cbr640 and from the thunderbike racer above.....aiming for the bmcrc thunderbike sport class power to weight 1bhp to 1.81kg.
I should be able to get 85bhp relatively easily, then gradually make my way up to 100bhp at the back wheel.