Team GPR

[F5 Dave]

Scott was lucky not to get hit in a nasty way there, bit scary.

[Bert]

Starting of a conversation...

This is the wrong thread for fuel discussion, it's all about dave and what he's done wrong....

However, as i remember it, everything was pump fuel - which was taken under the ACU regs of the time to include avgas...except supercharged fourstrokes which were limited to 100cc but could use open fuel. Pre '89 this would have included Nitro. The Methamol/Nitro option disappeared from buckets when it went from other classes too. I walked out of that years conference in protest....
Background - I'd been involved with the fastest F1 bike in NZ for 3 seasons using a meth/Toluene blend plus tony Mcmurdo's F3 and F2 bikes using the same blend plus big jolts of Nitro...I felt justifiably aggrieved that having out thought the opposition we were being banned.

Yeah but was that at the same time as the Robert Taylor TZ250 yam and BMS f1 framed 750 Ducati protest counter protest F2 saga.
I never knew the f3 GPZ500 was on the juice too though. I have that KB article somewhere with the write up on the F3 bike.

I'd be interest to learn a little more about the GPZ500... Have one in the shed and was thinking about what to do with it...

[Bert]

Scott was lucky not to get hit in a nasty way there, bit scary.

Yea could have been a lot worse. But it still looked like a footpeg into the lower back...

[steamroller]

Yea could have been a lot worse. But it still looked like a footpeg into the lower back...

He did get hit it broke daves foot peg off lucky scott was on some good drugs

[Grumph]

500 kawa twins - Kelford have the Megacycle profile we used. Good springs are mandatory - we used to regularly break R&D springs which were the best we could get at the time. .060in off the barrel, cut the piston squish area to match and hand finish the crowns to give clearance = 12.6:1 com. Shot peened rods, clearanced properly. Absolute must is remove the rotor from the alternator boss and make up a lightweight trigger on the boss. Don't do this and torsional resonances break the crank....Some porting required, exhausts in particular need work. Find an ignition box with a more agressive curve and higher limiter. When we put mine on avgas we didn't seem to lose much if anything. Mine on 36mm flatslides made about 72 at the wheel. Tony's on 38's and nitro made about 88 at the wheel i think.
mine's still in the barn, needs a rebuild, one day.....

[richban]

Here you go, I'm off to read the bible.

Interesting to watch the way the short bike of Nathaniel turns as opposed to everything else on the track. Also his weight is way forward compared to almost everyone else.

[F5 Dave]

Yet my NF4 is a total pig of understeer. DD did get some shock extenders.

[Bert]

500 kawa twins - Kelford have the Megacycle profile we used. Good springs are mandatory - we used to regularly break R&D springs which were the best we could get at the time. .060in off the barrel, cut the piston squish area to match and hand finish the crowns to give clearance = 12.6:1 com. Shot peened rods, clearanced properly. Absolute must is remove the rotor from the alternator boss and make up a lightweight trigger on the boss. Don't do this and torsional resonances break the crank....Some porting required, exhausts in particular need work. Find an ignition box with a more agressive curve and higher limiter. When we put mine on avgas we didn't seem to lose much if anything. Mine on 36mm flatslides made about 72 at the wheel. Tony's on 38's and nitro made about 88 at the wheel i think.
mine's still in the barn, needs a rebuild, one day.....

Cheers Grump.
This now sounds like a bit of fun with a boat anchor...
I wander if Scotty can be convinced to build another frame.
If we could get close to 70Hp it would be a cool club level bike.

[mr bucketracer]

if Nathaniel bike was not there it would be some real good racing , prombly 6-8 bikes that are even out there , all we are doing is waiting for his to blow up or come of to give others a chance. its so fast!

[steamroller]

if Nathaniel bike was not there it would be some real good racing , prombly 6-8 bikes that are even out there , all we are doing is waiting for his to blow up or come of to give others a chance. its so fast!

hard out my bike is 79kg with a tank of gas i am 74kg and the bike is 25 to 26 hp and it will never ever go past nathaniels bike on a straight and pull away. think the day of the fxr ever wining are over . same thing for most bikes out there.

[TZ350]

hard out my bike is 79kg with a tank of gas.....think the day of the fxr ever winning are over.

I reading this right, an FXR that is under 80kg....

[Grumph]

Cheers Grump.
This now sounds like a bit of fun with a boat anchor...
I wander if Scotty can be convinced to build another frame.
If we could get close to 70Hp it would be a cool club level bike.

Boat anchor indeed, i'm looking at the quoted weights for buckets and can tell you a race prepped GPZ500 engine, bare and dry weighs 72kg.....But that's lighter than an NC30 motor.

[steamroller]

79kg FXR with a tank of gas ????? am I reading this right, an FXR that is under 80kg....

HAHA you are right with all the fibreglass it is as light as i could make it small lithian iron battery scotts frame it all adds up so no fuel it would be like 77 kg. and still to slow

[TZ350]

77kg and 26hp FXR, that is a way better bike than the 2T Beast.

[Bert]

Boat anchor indeed, i'm looking at the quoted weights for buckets and can tell you a race prepped GPZ500 engine, bare and dry weighs 72kg.....But that's lighter than an NC30 motor.

What kind of torque were you getting out of yours Grump?