smashing front sprockets

Well i think i need help.Assembled my BZM 50cc 6port kit.Did all the mods and some to cases.BIG job.fitted 10mm reed spacer and walbro 21mm carby with big air stack.MY problem is now it snaps off Polini/bzm front sprockets.I have snapped 2x6 tooth,1x 7 tooth,And even an 8 tooth.It gets on the pipe and afther about 3/4 times of doing that.BANG broken.How do i fix this problem.Dont have any trouble with me other bikes.But this one man has some serious HP.Even with 8/74 it wheeies and bang.This thing i might have to convert to sidecar so as i can ride the beast.Any info would be good.
Cheers
Beans :o)

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6 bikes.
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one with RD top end kit.14/14 carby,carbon 3 stage fiber reeds,zx1 pipe
one with 55cc chainsaw top end, PBU pipe
ZX1 Taipan. PBU pipe,banshee engine.
Polini clutch bell .
2 X Banshees SHO
1 fitted with polini clutch,black widow triple stage reeds
19mm del rep carby,,billet head,billet reed cage, 6/76 gearing,sava tyres
1 fitted with 50cc BZM blata engine ,21mm walbro and BZM gold crank ( dangerous now:o)
1 blata SQ roller only
SRT Spooge Racing Team NTH Division

**** beans I dunno :|

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Archerfield Photos
140cc Minimotard

thanks squeeby.Its driving me nuts

__________________
6 bikes.
-----------
one with RD top end kit.14/14 carby,carbon 3 stage fiber reeds,zx1 pipe
one with 55cc chainsaw top end, PBU pipe
ZX1 Taipan. PBU pipe,banshee engine.
Polini clutch bell .
2 X Banshees SHO
1 fitted with polini clutch,black widow triple stage reeds
19mm del rep carby,,billet head,billet reed cage, 6/76 gearing,sava tyres
1 fitted with 50cc BZM blata engine ,21mm walbro and BZM gold crank ( dangerous now:o)
1 blata SQ roller only
SRT Spooge Racing Team NTH Division

Isn't there a process that will harden steel?? As in super heat the sprockets, then dip them in oil..

Or take them to someone who can do something similar ...

yeah.Thanks GLEN # 159Might havt to try the spring works.But these Polini/bzm ones are supposed to be F------n hard.AND the best:o(

__________________
6 bikes.
-----------
one with RD top end kit.14/14 carby,carbon 3 stage fiber reeds,zx1 pipe
one with 55cc chainsaw top end, PBU pipe
ZX1 Taipan. PBU pipe,banshee engine.
Polini clutch bell .
2 X Banshees SHO
1 fitted with polini clutch,black widow triple stage reeds
19mm del rep carby,,billet head,billet reed cage, 6/76 gearing,sava tyres
1 fitted with 50cc BZM blata engine ,21mm walbro and BZM gold crank ( dangerous now:o)
1 blata SQ roller only
SRT Spooge Racing Team NTH Division

Is you front and rear sprocket lined up correctly, could be a problem. Also each time you snap a sprocket are you using the same chain, Might want to check these out, could have a tight link or the chain could be bowed after the first time you snapped a sprocket, just make sure they are all ok. most pinions are already hardened as far as I am aware. good luck with it dude

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Shotgun: Better known as Pistol Pete.

yes ShotGun.Fit new chain each time.Have used up 2 boxes.$140.00 a box .And yes the wheels are in line.Use me straight edge to do that.

__________________
6 bikes.
-----------
one with RD top end kit.14/14 carby,carbon 3 stage fiber reeds,zx1 pipe
one with 55cc chainsaw top end, PBU pipe
ZX1 Taipan. PBU pipe,banshee engine.
Polini clutch bell .
2 X Banshees SHO
1 fitted with polini clutch,black widow triple stage reeds
19mm del rep carby,,billet head,billet reed cage, 6/76 gearing,sava tyres
1 fitted with 50cc BZM blata engine ,21mm walbro and BZM gold crank ( dangerous now:o)
1 blata SQ roller only
SRT Spooge Racing Team NTH Division

where is it snapping beans ? on the right side of the sprocket or are the teeth ripping off?

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55 cc head kit
Jet Pro pipe
19mm carby
3mm reed spacer
fiberglass reeds
Fullcircle crank
Quick turn throtle
Savas
Modded frame
Streetfighter front end

dyno proven 6hp

hey beans,

take a picture of the cross section of the sprocket, from that you can tell whether its broken due to hardness. if its very crystalline looking in the center then its probably broken due to over hardening which is quite possible.

ive had a few problems with overhardened shafts and things snapping off in my robots, and personally i fail to see the advantage of a hardened sprocket at all. as youve seen it helps none!

try tempering one of them..

heat it up to cherry red with a MAPP torch, drop it in oil, bring it back to cherry red again then put it in some lime to slowly cool. should do the trick.

if your shearing teeth i think your up **** creek without a paddle and will have to go to thicker chain! that or try checking how much slack is in the setup, if theres a fair bit the motor may be accelerating with such force its shearing the thing when its taking up slack.

in my etek bike im using twin #40 roller chain from an EA falcons cam shaft, gotta get serious with serious power

take it easy..

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www.demon50s.com

- BZM 6 port Banshee SHO
- Polini 911 - pro chinese for sale! PM for details.
- Pro SQ Cag

Thanks Glen.yeah could be the slackness in the chain.I dont run this one tight.Will have to check that

__________________
6 bikes.
-----------
one with RD top end kit.14/14 carby,carbon 3 stage fiber reeds,zx1 pipe
one with 55cc chainsaw top end, PBU pipe
ZX1 Taipan. PBU pipe,banshee engine.
Polini clutch bell .
2 X Banshees SHO
1 fitted with polini clutch,black widow triple stage reeds
19mm del rep carby,,billet head,billet reed cage, 6/76 gearing,sava tyres
1 fitted with 50cc BZM blata engine ,21mm walbro and BZM gold crank ( dangerous now:o)
1 blata SQ roller only
SRT Spooge Racing Team NTH Division