It is verified

[Don Hardcastle]

Went for a ride yesterday afternoon with the PC3 unplugged. I still have the stutter at about 7200 rpms in 2nd gear. So I guess in the near future I will get a big bore kit, cams, headwork, valve springs and oh yeah, transmission work.

I am hoping to be able to have her done before Spring. Don't know if that is going to happen tho.

Don

 

[Mr Brown]

If you want to do those things, fine, but I would get a professional opinion from a trusted source before I tore her down if I were you. A stutter in 2nd doesn't mean a bad motor or trans, it could be any number of things......

 

[Don Hardcastle]

(Mr Brown @ Oct. 31 2006,10:32) If you want to do those things, fine, but I would get a professional opinion from a trusted source before I tore her down if I were you. A stutter in 2nd doesn't mean a bad motor or trans, it could be any number of things......

Mr. Brown,
Do you have any idea what else could cause that stutter? Believe me I would rather not have to tear a bike down that only has 12,250 miles on it.

Don

 

[Pipefighter248]

Sorry to hear Don.
Def. get a professional opinion before spending that much money unless that's what you want to do.

 

[Don Hardcastle]

I have talked to Steve Smithers, owner of SmithersCustoms in Kanas City and Johnny Cheese. They both have said that if the PC3 is taken out of the equation and the stutter was still there, then it was 2nd gear. I followed the testing procedures they both told me to try and the results indicate a 2nd gear problem.

Don

With respect to the full rebuild and upgrade, my wife (Sailor's wife of 18 years) came up the analogy "If you pay for a hooker, you might as well keep her all night". If we have to split the case we should do all upgrades and work that we want to do at once.

 

[Projekt]

Nevermind, you posted something more relevant.

 

[Mr Brown]

Without listening to it, it's hard to tell. Is there any mechanical noise or is it a miss? My first thought is an ignition problem, or fuel delivery. If there is a problem in 2nd gear, it usually manifests itself by kicking out of gear, not stuttering....

 

[vman1300]

When mine went out, it felt like the chain broke. Under hard throttle, it would just pop out of gear.

And yes, once the cases are split, time for more mods!

 

[Don Hardcastle]

(vman1300 @ Oct. 31 2006,11:44) When mine went out, it felt like the chain broke. Under hard throttle, it would just pop out of gear.

And yes, once the cases are split, time for more mods!

When yours popped out of gear did it stay out of gear. This is just a blip. I can re-create the blip at will. It happens at 7200 rpms in 2nd gear undermoderate to hard acceleration.

Don

 

[BusaWhipped]

Just a thought, but can you get the shop to do a 2nd gear run on the dyno. It should tell you whether there is an ignition/fuel problem,or if the tranny is jumping internally.

 

[moondog]

Guys, I rode Don's busa on Sunday, it feels exactly like the chain slipping a tooth, but the chain is good. It is so violent that even though I was ready for it, it still scared me......it feels mechanical instead of electrical but I know things aren't always as they seem. It comes with a "bam" and about the time it's over, it happens again. Only in second gear, about 7000.....

 

[moondog]

Good idea by BW....let's take it up to pigtrail and put it on the dyno....

 

[Don Hardcastle]

It probably doesn't make any difference but it only happens during acceleration. If I let the bike decel in second from up there, it doesn't do it. I am going to tear into the service manual when I get home to see if there could be anything that I am missing. I would really hate to have the thing torn apart to find out I missed something.

 

[Don Hardcastle]

Can you round off just one dog on the gear? I am not a busa mechanic but it makes sense to me that if the gear started slipping, that it would continue to do so. Not just one little blip then pull like a train to the top of second.

Don

 

[Warputer]

(usn04limited @ Oct. 31 2006,15:27) Can you round off just one dog on the gear?  I am not a busa mechanic but it makes sense to me that if the gear started slipping, that it would continue to do so.  Not just one little blip then pull like a train to the top of second.

Don

I agree with that Don ! It dose "not" make any sence to only slip at one point , in one gear . It's gotta be something else .

 

[GoldenChild]

if it does it only in 2nd and you can't make it duplicate in any other gear at same rpm it's a bad 2 gear dog...i have ridden plenty bikes and they all do what your describing when the dog is bad.

 

[Don Hardcastle]

(GoldenChild @ Oct. 31 2006,14:46) if it does it only in 2nd and you can't make it duplicate in any other gear at same rpm it's a bad 2 gear dog...i have ridden plenty bikes and they all do what your describing when the dog is bad.

I am not saying that you are wrong. I just want to explore every single possibility before I decide that is it. Some of you guys on here can drop $4000-$6000 like it was nothing. I wish I had your problem. I have to be as sure as I possibly can before I decide on my next course of action.

Don

 

[Don Hardcastle]

Ok,
I need some help understanding this. I am not the smartest guy I know but I am not totally mechanically inept either.

If this is a 2nd gear issue, how can a gear slip, loaded, only once and not continue to slip? Why does it do it at exactly the same rpm?


Don

 

[heavybusa]

I dont have any expirience to add here

I do not want to discredit any of the advice you have here, but PM GPW he has tuned many bikes.

 

[johnstein]

(moondog @ Oct. 31 2006,15:11) Guys, I rode Don's busa on Sunday, it feels exactly like the chain slipping a tooth, but the chain is good. It is so violent that even though I was ready for it, it still scared me......it feels mechanical instead of electrical but I know things aren't always as they seem. It comes with a "bam" and about the time it's over, it happens again. Only in second gear, about 7000.....

this is exactly what happened to my bike it was rounded gear dogs and a scuffed shift fork , always in second gear as i kept riding it happened more frequently and at lower rpms , when it is decribed as skippin a tooth , when you decribe blip in second it sounds like a fuel problem its not very expensive to have fixed [800to 2600 dollars ] depending if you go with an oem trans , or undercut the one you have with heavy duty shift fork and billit shaft , i went undercut my cases were split 20,000 miles ago with no engine or trans problems yet , i have spoke with several members with this problem some of which had it covered under warranty , i wasnt that lucky. good luck