DAD, I'm hoping the plan is to see if it helps the Honda's enough to let the 4 valve motor stay at 700cc. Bob

Bob

Just throwing stuff up against the wall. Suzuki is the only Manufacture that makes a pretty good 750 cc motor for racing. Yamaha and Honda and Kawasaki seem to stay with 600cc motors. Why not grandfather the 700cc motors and set the limit at 600cc's. The heads are pretty good on the 600 motors the 750 Suzuki uses the same head I think. The cost of making a 600cc motor larger or 750cc motor smaller would probably double the cost of a stock 600cc motor and not add a lot to performance. Just Saying>>>>>>>>>>

Honest Dad himself

DAD Kawasaki makes a 2015 ninja ZX 636. Also all you need to due to a 600 is bore it and have it re plated no sleeving is needed. cost is around $500.00 I build them all the time for bikes and mini sprints. I own Watson Racing inc. in greenwood I am the guy that builds Dustin wheeldon and Kevin Blues engines. Like I said in my last post making a bore and stroke rule will force you to use a Kawasaki 636 36cc on a small engine makes a big difference. A 600 will not compete with a 636 if tuned correctly.

hill

Agreed 600cc's should be sufficient. If a guy has a 700cc motor grandfather it in. As far as overbore? I just bought a 2014 Yamaha for $1500.00 off of EBAY and I bring it to you for 2mm oversize pistons, Am I going to pay you $500.00 and go racing? Or will that 2mm come with a price tag close to that of another stock engine. Probably the demand for Kaw's is still pretty high too right?

Honest Dad himself

I haven't payed too much attention to the Kawasaki 600cc engines lately. I have spent a lot of time with the 1000cc motors however. The older 600cc motor had a bore/stroke of 67mmx42.5mm. They simply increased the bore to 70mm's to achieve 636cc's.

In the new 636 motor ol' Kawasaki decided to get the 636cc number by increasing the stroke, it dimensions are 67mmx45.1mm coming up with 636cc's also but giving the motor more low end grunt for the street, and probably making a better TQ choice also.

I have not read the rule book, but in the face book they state that the 636 package must remain stock bore and stroke dimensions.

What If>>>a guy started off with an older 600cc motor. They had a bore of 68mm's back then. Kaw tends to stay pretty much alike with internal dimensions. What if a guy dropped a late model crankshaft down into the older block. I haven't been inside one of these motors but knowing Kawasaki it probably would fit. Now you have a 600cc motor that been increased to a bore and stroke dimension of 70mmx45mm. Very close to 700cc's.

Would that be legal?

Honest Dad himself

how about just a 600cc 4 valve and ban the 636cc. That would make it simpler Kawasaki makes a 600 to. Then you could use a Honda Suzuki Yamaha Kawasaki every one would be equal then with lots of options.

hill

I like your style. But it would keep us guys who like to think outside the box very few options to play with. I would imagine that the extra power of that 36cc's is probably also brought about by more compression. These little motors still need a lot of tuning to work well in a race car giving engine guys like yourself work, but investing the price of another engine on 36cc's seems a bit off to me. I don't really know how we got off on the 2mm bore in the first place. I guess the reason was because everybody since the beginning of time allowed for racers to bore them out when they wore out (dirt and no air cleaners tended to do that I guess back then). Now days With labor and parts cost vs. replacement engine cost it just is not cost effective to bore them anymore.

It is kind of nice to talk to a guy who calls it the way he sees it, and is looking out after the racers best interest.

Honest Dad himself

I wonder if the 600cc motor is not as much in demand for Micro racing would they also be less expensive than the 636 version of the motor?

Honest Dad himself

I was wondering last year at king of Tq banquet Terry said 2016 was his last year.who is this going to take over operation.how is this changes going to effect the future of any club .