Hi RR
I see you have stuck with the "standard" valve spring setup on that head??
Any particular reason for this and not going for the goldie spring conversion?
Regards
John
no particular reason, good question...it still pulls through to 7500 readily, for that matter the timing gears are not lightened, nor the rocker arms polished. Its a pretty stock motor apart from the short steel capped alloy rods and a bearing conversion. Pulling a chair means the engine works very hard through the range compared to a solo and its currently the quickest 650/4 speed outfit on the track. - although most of the triumphs are now going big bore... so I could really do with more cubes
There is more tuning left in this motor but am slightly over committed with 6 BSA's in the shed (2 are my daughters) to maintain and my sons basket case '66 mini. so absolute fettling not likely to happen on my watch, unless I win lotto and retire to the workshop. Once somethings going strongly it tends to get left.
Current race money is going into rebuilding my front wheel (new hub drum centre being fabricated) and the SC gearbox to get me back on the track for October.
The head is A7 and had a mixture of collars and collets originally fitted, which shat themselves (as I hadnt realised they were mismatched -I removed 26 collet pieces and some bent valves after its first meeting) so bought stock parts to get the long rod motor back out racing and havent reconsidered as it does the job.
The Bob Newby clutch is a godsend, allows the bike to get its power down hard off the starts and it usually lifts the front wheel which seems to get us off the line quicker than if we spin up the rear tyre. That was a sound investment.
I guess there's always more left in the pot, the question is will it cut my laptimes or should I just eat less pies...