Team GPR

[koba]

I think I'll lay low on this one...

[Bert]

Yes it sounds nice.....

I think I'll lay low on this one...

Yip.

[mr bucketracer]

first run up with the 100twin , no sezing up this time . 1mm larger stingers so good of the gas ..27hp 5 runs in a row , thought it was the pipe killing the rpm but now thinking its the 1989 rgv cdi box? just need to finsh putting back together now

[F5 Dave]

Nice so the power falls or stops at 12,000? Looks like some more hiding after that. So MB50 barrels but MB pistons lose their tips any where past 12000 or RD pistons which require mods

[mr bucketracer]

Nice so the power falls or stops at 12,000? Looks like some more hiding after that. So MB50 barrels but MB pistons lose their tips any where past 12000 or RD pistons which require mods

it just stops flat , it still has the mb pistons in it , they do flake kind of thing . i cleaned the tops of the pistons up in the lath to see if would stop that

[mr bucketracer]

going of the net the rev counters of rgv go to 12.5 but in saying that most road bikes dont rev as high at what it says

[TALLIS]

That power curve seems like it's heading up up and away. With afew more rpm who knows. There's something to be said about reliability tho. Should put some of that fuel we were using last night in it

[mr bucketracer]

That power curvr seems like it's heading up up and away. With afew more rim who knows. There's something to be said about reliability tho. Should put some of that fuel we were using last night in it

i would like to fatten the hole curve up , reving it out not under load sounds good but on the dyno it runs rich in the mide range then all hell breaks loose lol . yes that drink may run well in it (-;

[F5 Dave]

Mb rings are 1.5mm thick. The tips jump off and power goes flat if over revved. Aftermarket may be the go if you get keen. Else keep revs where the are.

[mr bucketracer]

Mb rings are 1.5mm thick. The tips jump off and power goes flat if over revved. Aftermarket may be the go if you get keen. Else keep revs where the are.

these pistons come from germany but still 1.5 thick , if i can get the bike going ok i will look for something better or else just a show pony for the odd round

[F5 Dave]

I used to run RD pistons but there were two types and they discontinued the 1.2mm ring type + there were a heap of mods to do.

[mr bucketracer]

is the rd piston standard the same diameter as the mb piston standard

[husaberg]

is the rd piston standard the same diameter as the mb piston standard

Scott have a look here
http://www.vrm.se/ go to the piston page.
Open up google translate unless you can read Swedish.

PROX Honda MB / MT 50 Standard original piston

PROX original scooter piston for standard bore 39mm .
Overall Height 50.60 mm
Height to the piston edge of 46.60 mm
Center bolted to the upper edge of 23,50mm .
Center bolt to the bottom of 23,10mm .
2 piston rings made ​​of cast iron 1.5 mm high .
Piston pin Dimensions 12x31,50mm .
Piston Ring Locking kl.7 and at the fifth
Order number 01.1003 STD

There is a few that share the low deck height of the mb
with 1mm rings
plenty more if you the deck height is not so important.

Barikit Bidalot Racing Piston 40,30mm.P - 426-1S

Barikitkolv made ​​by Bida Lots specifications for engines,
with bore 40.30 mm .
Kanoonsmidig and lightweight piston for limitless racing !! ; =)

Total height 45 mm.
Height to the piston edge 43 mm
Piston diameter 40.25 mm .
Distance from the center piston pin to piston top edge 23 mm .
Piston pin Dimensions 12 x 33 mm .
A Chrome Molly Ring of 1mm .
Piston Ring Locking clock 6th
Piston pin locking supplied

[F5 Dave]

From ailing memory the RD was OK for the under 53cc rule on std 40mm and first maybe 2nd oversize as yam did 0.25 steps. Course the 100 rules are more restrictive. Perhaps we should campaign for a 106.5cc oversize. No hidden agenda. . .

Had to move ring peg. Use thrust washers and cut skirt depending on rod size.

[TZ350]

first run up with the 100twin .. 27hp 5 runs in a row.

That is very impressive, another interesting and super special bike from GPR ....