Hi Phil...

My old 500/4 SOHC Honda race engine used Kawasaki pistons....

The gudgeon pin holes were 2mm smaller and had to be re-machined and the valve recesses recut 0.5mm deeper, then they were perfect....plus a 1.5 raise in compression. :cool: Worked well with the Joy (Isle of Man profile) cam and the close ratio box.

If I remember rightly the dyno-read-out (still got it somewhere) was 71bhp ATBW

So there's always "something" out there, its just a question of satisfying the compliance police :D :D

So all in all 583's are here to stay.....for the forseeable future

For me they should be and I would think most others want to race them. I'm getting too old for anything faster anyway.:eek:

These suit me fine. :D

i dont know about anything faster,they still hurt when you come off or get knocked off!!apart from the people in the paddock,the apealing thing to me about dd racing was the regs keeping the racing close ,ie rider skill notpocket money,for my ten pence worth (gone metric now)i would like to propose that more emphasis be put on the horsepower limit than what you actually put on the engine to achieve it,those that like to tinker may find ways of acheiving more usable power range,/delivery but we would still all be limited to say 53 bhp. at the moment we are moving into a scenario that budget racing is becoming expensive ie spend £300 on barrels and pistons or run with a lower bhp,so it doesnt matter what pistons,igniters,timing settings you use but be prepared to spend an agreed amount say twice a year un anounced to have your bike dyno tested,this negates the problems of having to stump up for an appeal ,acusations etc which is damaging to the paddock, after all i am sure dynojet kits,air filters and open pipes (all legal) are far more effective than ignition timing.
now just a quickie on tyres i was one of the infamous four on z rated tyres at castle coombe-for which i apologise but ignorance is no defence !! i have managed to build a monster and recently run it at mallory on 2nd hand h rated tyres and ran 3 seconds quicker than my best race time !! so my thoughts are a fresher engine /setup is far more effective than a miniscule tyre issue,however tyre safety must be paramountand we should be able to rely on manufacturers compliance ,whoever they are,but i do miss the bridgestone /michelin battles of the old moto gp days .anyway i have run out big words now ,and as a novice running around at the back i just enjoy the oprtunity to race ,and at least i aired my unqualified thoughts. cheers phil
ps attaced pick of the new class b 96

new - old engines?
 

My £300 ebay second hand engine seems to be o.k. without spending time & money rebuilding. But... it does look like it spent the last 5 years at the bottom of a lake!

they never blow up anyway, do they?

Matt #72

Well not racing in DD next year means I have no axe to grind regarding tyres, but Maxxis, whose product has been tested as you all know, by some Class B midfielders and Sam West, the Championship leader ( who would change tomorrow if he could ), who want to put a deal forward that offers the letter of suitability that the club wants, pairs of freely available, ZR rated tyres to participating riders for £100 a pair, donate 2 pairs of tyres at each round as prizes, donate all the cups and trophies for the podium places for the full season, and work out a way to get the tyres to the tracks and fit them. But there is a wall of resistance to keep the series using a tyre from a manufacturer that gives bugger all to those riding in the series, that still insists we advertise their product on the bikes. So PLEASE, dont lets have talk about keeping the series economical when the tyre costs could be slashed in an instant but WONT be.

No one has seen the other letter yet from that Pirelli company. Well I say no one, but lets make it available for all to see.

As one of the CC naughty boys I have changed my ZRs to Hs and will be pretty miffed if we're to change but if it means safer and more cost effective racing then I like this Maxxis idea.
Pair of hardly used Hs anyone?

FREE THE CC4, we're just stupid not cheats!

:devil: Its an easy error, tread pattern is the same, no one seems to know why ZR were allowed then suddenly they were not. Possibly they are easier to get hold of from anywhere.

Not ridden on maxxis yet!

I have done various TD's with Ghost this year and the last one at Pembrey
Phil didn't have problems getting heat into the tyres and the grip looked good
while my diablos moved around alot trying to stay with Phil.

Iv'e seen plenty of ZR rated tyres fitted to slower lighter race bikes and on the road :confused: