Stuart Racing
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N.H.R.A . Dragracing.
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posted September 27, 2007 06:41 AM
 Edited By: Stuart Racing on 27 Sep 2007 09:49
trans.woes
Well I guess I should have done more reasearch on this bike(zx12r)....Trans. has gone south(dragracing)...Won't go into 3rd gear airshifting...But works fine on the street....SUCKS....If I would have known these transmissions were made out of glass I wouldn't have bought it...I guess live and learn...I'm not spending $800.00 to $1000.00 on trans. work....I've tried everything to get this thing to shift at the track(chain adjust./shifter adj./air kill adj./ect.ect.)Can the Muzzy high pressure regulator be turned up any way at all???..Just won't go into 3rd....Thanks...
C ya,
Paul......
  
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salsa1
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posted September 27, 2007 09:43 AM
Sorry to hear Stuart...
Trade it in at a dealer or sell straight out if it is street worthy...just take off all the racing parts you can take off for your next 12r .. make it streetable ...if possible ?
...and start all over ... 
just an idea...hope it works out..
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ninja12
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posted September 27, 2007 12:44 PM
When was the last time you replaced the shift forks?
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Stuart Racing
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posted September 27, 2007 01:11 PM
quote:
When was the last time you replaced the shift forks?
Never...But it works flawless on the street full, out shifts,no problems at all....But at the track 1st gear,waaaaaaaa,2nd gear,waaaaaaaaaa,3rd gear< revlimiter(don't know that sound)...
I love the bike....I have it setup sweeet too....
P......
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Stuart Racing
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posted September 27, 2007 01:13 PM
quote:
Sorry to hear Stuart...
Trade it in at a dealer or sell straight out if it is street worthy...just take off all the racing parts you can take off for your next 12r .. make it streetable ...if possible ?
...and start all over ...
just an idea...hope it works out..
That definetly a thought bro......As long as the next 12r has a good tranny....
Paul......
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zrexpilot
Expert Class
Posts: 470
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posted September 27, 2007 01:40 PM
3 years of dragging my 12 and probably around a 1000 passes, no problems so far.
Busa trans is the one that has problems, seen this in a bunch of my friends bikes.
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shane661
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posted September 27, 2007 03:09 PM
This sounds crazy to me. You love the bike and beat the shit out of it regularly...but you are going to get rid of it because the trans might need freshened up?
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Stuart Racing
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posted September 27, 2007 04:00 PM
quote:
This sounds crazy to me. You love the bike and beat the shit out of it regularly...but you are going to get rid of it because the trans might need freshened up?
Ya a little fruity huh.....I can't call it dude....Maybe I'll figure it out one of these days.....
Paul......
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Stuart Racing
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posted September 27, 2007 04:04 PM
quote:
3 years of dragging my 12 and probably around a 1000 passes, no problems so far.
Busa trans is the one that has problems, seen this in a bunch of my friends bikes.
Maybe it's not the tranny...I took all the sfiting stuff apart cleaned and inspected,used air tool oil to lube all pertinent parts,new air line,tried a different adjutment on the lever...I'll try one more time. If no go I might look for a used tranny to get done up...
Good luck with yours,
Paul.......
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MadMike
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posted September 27, 2007 05:40 PM
I know some people have had issues with the tranny, but Knock on Wood... I have had no issues... change the shift forks fist... cheep and easy to do with the motor in the bike still...
and maybe a dumb statement... but what does you clutch look like? if it is slipping in third or your tire is spinning it will NOT shift properly....
but sounds like you just need new shift forks...
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salsa1
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posted September 27, 2007 05:43 PM
my linkage from the pedal to the shifting star thing was loose and would not shift into first very well.. first thoughts was I am screwed.. then I found it was just the linkage not being tight..
just agreeing you should eliminate all other possibilities before drawing a solid conclusion...probably not telling you anything new but you might just get lucky and find the problem repairable...
I know the feeling.. I don't want to split the cases on my ZX-11...I have been with a bum second gear for a few years.. don't want to do myself and don't want to pay for it.....
good luck.. let us know how it turns out...
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Salsa1
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zrexpilot
Expert Class
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posted September 27, 2007 05:44 PM
how is your shift cylinder hooked up to the shifter ?
Do you have one of those easy install brackets ?
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nox
Needs a job
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posted September 27, 2007 05:45 PM
The 12s are bad about the circlip coming out in third when you push it hard......, pops out, then pops back in, mine was doing it........., I have HD harley clips in my tranny......, and wider grooves cut in the shafts to hold it........
His clutch is locking in, he has my old lockup, and it is locking in, trust me.........
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Stuart Racing
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posted September 27, 2007 06:00 PM
quote:
how is your shift cylinder hooked up to the shifter ?
Do you have one of those easy install brackets ?
I have the Muzzy bracket deal....I tried today to hook it up, straight up...But couldn't get the adjustment just right,either it wouldn't go into first or it wouldn't shift up, to any gear ...So I put it back to the Muzzy bracket...But made a couple of minor adjustments...
Mike:
I just think if the forks were bad,it wouldn't shift right on the street either,ya know....
I just put an entirerly new clutch pack(steal&fibers)....
Boy I wish I had enough power to spin the tire in third gear,at the drag strip.....(stock motor)...
Can the Muzzy regulator be adjusted higher or not,does anybody know????
Thanks alot guys,much appreciated believe me,
Paul.........
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nox
Needs a job
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posted September 27, 2007 06:15 PM
Paul, call me tomorrow afternoon, like 4 or 5 your time, or later.......
The one I had was adjustable and I can talk you through it, but if you do not have a guage, you wont know where you are at..........
It should shift fine with 100 lbs.
I have made a pass with my bottle turned off........., using what was in the line.........
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lietoome
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posted September 27, 2007 06:36 PM
I had the same problem with my 14.....1, 2, re limiter.. My bottle pressure was low on my muzzy kit.
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krexken
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posted September 27, 2007 06:55 PM
I'd still suspect the shift forks. It's much easier for the trans to shift in normal riding. A shift fork doesn't necessarily stay bent. It will usually bend or flex when loaded up hard, like when shifting at WOT. Normal, easy shifting isn't enough to make it flex so it shifts otay. Always inspect the shift drum for wear also. Busas are bad about drum wear and shift fork shafts flexing also. Third gear is undercut a decent amount from the factory also. Usually not a gear to have problems with.
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TurboBlew
Moderator
BUSY DOING THE SCHIAVO
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posted September 27, 2007 06:58 PM
Werent there issues with the Muzzy setup anyway? Could have caused the bent shift forks.
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nox
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posted September 27, 2007 07:47 PM
yeah, I made my own set up, thiers kept crapping out on my, probably cost me a few thou in purse money........
third does have issues......., several things in the tranny do. I spent 1700 at Rnd, and now mine will shift on the limiter, spinning like mad, you name it, it goes to the next gear........
I cant wait to get my motor together, and get out and start cutting heads again......
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stuart racing
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posted September 28, 2007 03:56 AM
quote:
I'd still suspect the shift forks. It's much easier for the trans to shift in normal riding. A shift fork doesn't necessarily stay bent. It will usually bend or flex when loaded up hard, like when shifting at WOT. Normal, easy shifting isn't enough to make it flex so it shifts otay. Always inspect the shift drum for wear also. Busas are bad about drum wear and shift fork shafts flexing also. Third gear is undercut a decent amount from the factory also. Usually not a gear to have problems with.
I here ya Ken....I don't shift it easy on the street to test...But sure isn't the stress that I put it through like at the track....Alot more traction at the track,and stress....Got a pic. someone took at the track...Looked at my chain and it was almost touching the ground on the leave....(well not that close) but it was hanging pretty low...And I run a pretty snug chain adjustment too....This bike only has 5000 miles on it...02 12r...When I put my hand on the shifter to bleed off the extra air after racing,it just dosen't feel like it is pushing verry hard...I took it for a test last night and went full throttle redline shifts on the street ,NO problems at all,went through 3 rd easy........
Thanks Ken,
Paul......
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nox
Needs a job
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posted September 28, 2007 05:14 AM
Maybe it was some trash in the valve........
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2009 PMRA Super Street Points Runner-Up
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AMSOIL
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psycho1122
Pro
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posted September 28, 2007 06:13 AM
I would Still inspect Forks and DRUM.
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wolf racing
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posted September 28, 2007 02:28 PM
Normally, with those symptoms, it would just be that the engine isn't unloaded enough. Especially if it's working on the street. Like the delay is too short on dropping the engine of full load.
Or, the ramp isn't travelling far enough to engage third.
Good it worked for you at the track on your last test.
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Stuart Racing
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posted September 28, 2007 04:32 PM
quote:
Normally, with those symptoms, it would just be that the engine isn't unloaded enough. Especially if it's working on the street. Like the delay is too short on dropping the engine of full load.
Or, the ramp isn't travelling far enough to engage third.
Good it worked for you at the track on your last test.
No it didn't work at the track,but it did on the street,(perfect).....I like your idea...On the kill box I have...Under the inspection plug where you adjust the kill time,the guy before me buggered up the screw to where I don't or can't move it...I guess I'd have to get a new one to be sure....On testing with NO air motor running throttle at about 4 to 5000 rpm's push the horn/shift button motor sounds like she's killing, some.....
I'd like it to be to fast of a kill...If I back out of the throttle it'll shift....
Thanks,
P........
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wolf racing
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posted September 29, 2007 02:39 PM
If it's the older style Muzzys box with only one screw, take the cover off the box. Use a pocket knife or sharp blade on what's left of the screw.
Also ckeck there are no breaks to the connections to the fuel injection wires. So that it is cutting off all injectors.
When you push the button to test, you should hear the engine drop quite clearly.
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