100cc classic production build

[roflhat]

Thanks for all the info, will bear it in mind if I am competitive at Bonneville. Looking at the FIM records it seems as though I could attempt it at Elvington down in England, which would mean higher speed - not being on salt or at altitude

[roflhat]

Won't be going to Bonneville this year, just too many uncertainties with covid. Might look at doing something in England if they go ahead, and planning a return to Coniston to improve my water speed record

[roflhat]

Been doing a bit of a restoration on the bike, frame and a lot of other bits have been powdercoated. Really pleased with the finish, as new.
New shocks, fork oil, rear mudguard and stainless front mudguard



Also been doing some fiddling with the engine, need to get it back on a dyno to see if it's helped

[roflhat]

Was playing with some free programs for pipes, I think mine is not too far away from these given the restrictions for class

Drew them up in Rhino quickly


Got a new ignition coming all the way from New Zealand, very kindly given to me. Going to get that on then take the bike back to a dyno to play with jetting

[Stainless1]

Can you measure and input your stock pipe in these programs to see where Suzuki optimized their exhaust?  My guess is that you have to use a pipe that appears stock in your class
 

[roflhat]

There's no cone inside the standard pipe, currently working on it 

[roflhat]

Anyone able to confirm, does the exhaust have to only appear stock or does it need to sound relatively stock?
I've modified it a touch which has helped performance but it's much louder than before

[RansomT]

Anyone able to confirm, does the exhaust have to only appear stock or does it need to sound relatively stock?
I've modified it a touch which has helped performance but it's much louder than before

Look stock, sound doesn't matter.  However, you should be able to stand at the back of the bike looking down into the exhaust and not be able to tell if it has been modified.

[Stainless1]

Well sorta.... the exhaust should look stock... the exit from the muffler should appear stock, it cannot be enlarged.  But... if you modify and the exit remains stock size you should be good.  I reworked the muffler on the GSXR 1000 when we set the Production record... 2003 ish...  The can was a little tough to reseal to look like stock...

[Seldom Seen Slim]

When we took Nancy's 1350 P/P bike through Impound we had complied with an inspector's suggestion that he'd like to be able to find some type of baffle or obstruction when he poked a pencil into the exhaust outlet of the factory cannisters.  Said cannisters and their innards had received some attention as is allowed, including the faux baffle, but we were questioned about the weld seams of the cans, which could be described charitably as "buggered up".  Yes, we did get the record certified, but not without a fun few minutes telling the inspectors that what they were seeing was simply the work of a trainee welder on a Monday morning shift at Kawasaki.

Were they convinced by the story or was it Nancy's blonde hair?

[roflhat]

Excellent thanks for that, I'll put a factory baffle in the exhaust. Shouldn't hurt the power too much, might stop my ears bleeding so much!
Taking my time with the exterior welds and grinding them back so they look just like the factory ones. Quite pleased with the results so far but will need to get it rechromed or powder coated afterwards, I don't have blonde hair so I'll have to do a better job of it 

[roflhat]

Also over 200mph on a production xz15 seems like an excellent speed, haven't seen many P class records where the speed is higher than the original listed for the bike

[roflhat]

One more question, the rules state stock carb which I have but I've used liquid metal to smooth the inlet on the carb into a bellmouth. Is that allowed or does it have to be untouched?

[Stainless1]

Again appear externally stock... anything they can't see from the outside is legal.
 
Maybe they have changed but I've not heard that any inspector wanted to see a baffle in an exhaust... I would send that question to the tech chair listed in the rulebook.   The rule says the hole is the same diameter and placement in the exhaust. Please report back on what they tell you.

[roflhat]

Sounds promising, could maybe get away with a powerjet too.
Can't find the tech chair in the rulebook, do you know who it is? Or an email address?