In tandem with the #3 srx rebuild, i have been rebuilding 'tiggy' (Andy's Tigcraft/srx/szr/many other-odd-bits, supermon racer) you may remember I aquired from Andy a (long) while ago.
Had quite a bit to do, the frame (a piece of artwork from Tigcraft) had a crack, which leaked oil (oil in frame you see), so that had to be fixed.
the rear sprocket carrier was shedding its bolts at an alarming rate, and as all the threads had alrady been 'spiralled' we drilled them all out, welded up the holes and redrilled and tapped.
As such, the rear subframe exists only as a fibrglass shell forming the seat and tail, it also seconded as a handy place to hang the 'silencers' from, unfortunately the mounting areas for the silencers and the tail unit itself were not working very well tall, so a couple of days fibreglassing in extra support webbing was required.
it was now in a state where it could be taken to 'X-Bikes' in Wisbech (handily close to where i work) who have a dynojet dyno. Initial tests proved the engine had a high compression ratio, in as much as the dyno starter motor burnt out trying to swing it over!!
. V pi55ed off dyno manager and a month wait for new motor from the states.
with the dyno working and everything else set up (electronic ignition etc), she fired up uk, and without any adjustments was putting out 65bhp at the wheel.... not bad....Andy had got his sums right here.
the problem was (as we found out at Cadwell last year, there is bu55er all until 4k rpm, it just bogs at lower revs. several hours and lots of needle/jet combinations later a very nice flat line was achieved all the way up to 7.8k revs which was also where the peak power arrived, a whopping 70bhp on the wheel.
with the bike back home, lots more to do... new caliper bracket required on the front brake, as only 50% coverage with the existing one.. new silencer hangers to be made up to mate with modified and strengthened mounting on tail section.
A paint job required.....
to be continued
pics to follow
