aliveagain
Needs a life
Posts: 5033
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posted May 28, 2004 05:44 PM
transmission
I hear a lot of talk about engine mods but not to much about the trannie.Any problems or mods for them?I already have a Muzzy basket and hub but my last run had the gears hanging up in 2nd and I wonder if I should be watching out for anything.
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I wondered why the baseball kept getting bigger. Then it hit me.
  
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted May 28, 2004 07:28 PM
Spend the big bux onna auto?
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wannabe
Pro
Posts: 1931
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posted May 28, 2004 07:35 PM
auto tranny's are only good on a smooth track. If you try using an auto on a bumpy track, you're going to be in a world of hurt.
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entropy
Moderator
Posts: 8671
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posted May 28, 2004 11:50 PM
what do you mean "hanging up in 2nd"???
popping out/in 2nd under hard accel is the prime indicator that yr shift fork(s) are worn and need to be replaced.
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CrotchRocket
Moderator
Bracket Racing with Betsy
Posts: 8038
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posted May 29, 2004 05:19 AM
I bet he didnt shift it hard enough into 2nd, so it popped out...
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Jason Miller StreetBike Seminars
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aliveagain
Needs a life
Posts: 5033
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posted May 29, 2004 09:08 AM
I went to shift to 3rd and it wouldn't budge even with the clutch disengaged.Shifted fine on the ride back home.
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I wondered why the baseball kept getting bigger. Then it hit me.
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted May 29, 2004 12:09 PM
Not only will the shift forks need to be replaced but the engagement dogs and slots on the gears are probably FUBAR as well. Replace those...
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krexken
Zone Head
Posts: 732
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posted May 29, 2004 01:31 PM
Hopefully the only thing you need is more practice shifting at WOT. It takes a smooth foot and good timing to really make is sing every pass. That's why I opted for the shift lever triggered ignition cutout box. Makes it way easier and easier and smoother is definietly easier on the tranny parts.
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aliveagain
Needs a life
Posts: 5033
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posted May 29, 2004 02:47 PM
waiting on a CO2 shifter now,thought I remember reading here that the shift forks are a wear item,who sells replacements?
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I wondered why the baseball kept getting bigger. Then it hit me.
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ninja12
Needs a job
Posts: 3310
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posted May 29, 2004 10:41 PM
ronayers.com is a wallet friendly supplier of oem kawi parts.
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aliveagain
Needs a life
Posts: 5033
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posted June 01, 2004 07:36 PM
any other options besides Kawi?I think BDE makes the shift rod but I want to know about aftermarket forks.
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I wondered why the baseball kept getting bigger. Then it hit me.
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ZX12Girl
Pro
Adrenaline Junkie
Posts: 1740
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posted June 02, 2004 07:03 PM
I have not had any transmission issues on my bike - 2000 ZX1270.
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psycho1122
Pro
Posts: 1608
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posted June 08, 2004 08:23 AM
 Edited By: MadMike on 10 Jun 2004 15:20
After 7000 mi of hard canyon riding and many track days on my 1270 engine.........3rd gear finally gave up! It blew into at least a dozen pices and locked up the trans on decelleration at @ 130 mph at the end of a strait at AMP. This failure proceeded to send the input shaft out the side if the case, shattering the oil pump drive gear which in turn sheared the oil pump drive shaft. The stump of the shaft w/ what was left of the gear on it ran around inside the clutch housing behind the basket (Falicon Billet) and bounced of #4 rod end and crank drive gear before it was spit out the front of the lower crankcase!!
Transmission, cases, basket, crank, #4 rod, shift forks, and all related cluch components were junk.
Moral of story.....Dont have any ZX12 gears undercut! This will weaken already weak 2nd and 3rd gears. If the dogs are rounded, replace the gears w/ new ones or do what I did and invest in BILLET gears from Billy Robinson at
http://www.robinsonindustriesinc.com
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Ra12r
Zone Head
Posts: 919
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posted June 08, 2004 08:29 AM
Your link does not work. I tried the address too and coulnt find them.
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psycho1122
Pro
Posts: 1608
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posted June 08, 2004 08:37 AM
Ra Try again.....address updated!
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entropy
Moderator
Posts: 8671
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posted June 09, 2004 03:30 AM
holy schitt, psycho!!!!!
I'm glad you didn't go down! Must have been a hairy deceleration, eh???
Time to buy a used motor and build it!
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psycho1122
Pro
Posts: 1608
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posted June 09, 2004 08:51 AM
That's exactly what I did!!!
You would be surprised how well composed the chassis was when this occured!! Rear wheel locked up and I was able to "back it in" off the track, the 12 is VERY slideable. It is very fun to power slide out of high speed corners leaving blackies!!
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You say PSYCHO like it's a BAD thing!!
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
Posts: 4089
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posted June 09, 2004 09:16 AM
bet that was fun...whats the tire look like after a 130mph powerslide?
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psycho1122
Pro
Posts: 1608
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posted June 10, 2004 11:44 AM
H2 held up very well...no real issues.
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ninja12
Needs a job
Posts: 3310
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posted June 11, 2004 06:05 AM
First Trans problems i heard about on the 12.
Anybody else have or heard of these?
Damn good riding psycho!
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AnotherRedHead
Expert Class
Posts: 348
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posted June 11, 2004 06:07 AM
ive talked to RnD a few times about things. These trannys are very good, just need to have some slight mods done to them. About 600 bucks worth. Just need to send your shift drum and the gears to them and shift forks
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psycho1122
Pro
Posts: 1608
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posted June 11, 2004 07:39 AM
WARNING!!
Do not undercut 2nd, 3rd or 4th gear on the Output shaft!
Both 3rd and 4th gears have an offset (the window "spokes" are not centered) and both gears get side loaded.
Unercutting weakens the spokes (Only 5) and failure, ESPECIALLY w/ higher power apps. will evenually cause gear to fail.
According to Billy Robinson....."3rd gear in the 12R has got to be the weakest gear KHI ever put into an engine"
A stocker w/ a pipe etc. w/ no modified trans should have no issues.
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You say PSYCHO like it's a BAD thing!!
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AnotherRedHead
Expert Class
Posts: 348
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posted June 11, 2004 08:42 AM
RnD has done Rickeys and Cobys shootout bikes, all the velocity bikes, all teh 60 inchers, I think they have a handle on what needs to be done.
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TurboBlew
Moderator
BUSY DOING THE SCHIAVO
Posts: 4590
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posted June 11, 2004 10:46 AM
The $600 price only is only for services on a new or like new trans.
Start getting into cryo'ing, replacement parts and your bill could total $2000 in no time. 
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