Quote:
Originally posted by skidlids You probaly could put the 620 engine in the 583 chassis but you would have to gut the lower brace bar just as you would to fit shorter inlet tracts. Not sure what total cost will be Jim at Bike Enders had a 5 speed engine with some damage for £375 |
Ok, my final word on the power and class debate!:
In an effort to put my money where my mouth is and prove that I'm convinced of the power defecit a 675 is suffering I've reviewed just about every option of fitting a 620 engine to my bike.
The only realistic way to get a 620 engine running is a 583 chassis is to ditch the fuel injection and most of the 620 electrics. Thankfully this is within the rules as carburation is free, but I'd love to have kept the throttle bodies, as carbs are much more expensive to set up and will require custom inlet manifolds.
The only exception to this is if you manage to get hold of a crashed-but-complete bike that still has the keys, ignition barrel, immobiliser, ECU, coils, reg/rect, etc, etc.... I've tried to find this lot and failed miserably. The general idea is that they would cost over £1k even if you could find them.
Even if you take the 620 with carbs route then you'll have to change the electrics and the l/h engine cover. Reliability may well be an issue and you'll end up chucking £200 on dyno
time to get the manifolds and jetting right.
It's a huge amount of work and expense for a low-budget team, and will only pay dividends if the club decides to allow 620 engines to have big bores next year. I can't afford it at the moment and, more importantly, have an engine that runs in bike that's handling ok. Any results I acheive will have to be based on that.
If the series doesn't expand into a bigger class next year then I can only hope the rules stay as they are and allow us to remain in the top half of the field.
Cheers,
Ali
ps: If one of the 620 boys would like to buy and use my 675 engine in their bike then I'll be more than happy to let it go for a reasonable price... say the £1000 it owes me!