[Jaben2]

Just was wondering how many people out there were having problems with them. It if you have had problems what do you have done to your bike? I have stage 2 cams, and it seems to be a common problem with these cams.
Anyone else?

 

[MY100]

what problems?

 

[bwds]

a few have brocken including destroyer ones , the butterflys get a crack in them at the shaft where the screws go ,i think from memory ,if thats what jaben is talking about

 

[Jaben2]

Yes, that is what I was talking about. Sorry, I should pay more attention to what I am writing.
Who has broken the shaft that the butterflies mount too. I have now broken two of them. They both broke right at the mounting screw. The shaft cracks all the way through. I am going to take a few pics of the current one, and try and post them.

 

[Jaben2]

Here some pics of what I am talking about. Sorry about the bad pics they are the best I could get from my phone.
You have to look closely right at where the bolt goes through the post.

 

[lbrown]

i wish you guys would stop scaring me... i would be sick if a screw out of a throttle blade or part of a shaft went through our motor...gonna be checking ours closely..

 

[Jaben2]

Not trying to scare anyone, just getting info out that things are breaking. It seems like it is mostly people with the stage 2 cams. I haven't really heard of any other setup breaking like that. That is why I asked the original question.

 

[bproulxvrod]

Mine broke and I have Megacycle cams that are outrageously huge (not very streetable IMHO) that I plan on replacing with Stage II cams shortly. Mine has been back together for a while now though with no more issues.

 

[lbrown]

we have run ours for quite a while with a lot more radical cams than stage 2.. i have seen what a screw can do in a cyl.. i have too much time in our cyl heads and pistons to not cry like a baby if it happened to us..

 

[Jaben2]

Well unfortunately i have broke two of them. Each time it cracked both posts completely through.

 

[o2man98]

IF the cams were to have anything to do with breaking throttle bodies I would bet it is a harmonics deal causing the plates to flutter causing fatigue of the metal.

 

[bproulxvrod]

I believe mine was a tuning issue. I had a lot of decel popping going on and heard it through the intake a few times and then the blade shaft was broken.

 

[bwds]

ask sprintex about screws dropping down into the cylinders,it aint pretty ,:hidesbeh:

 

[smoothrod]

Not trying to scare anyone, just getting info out that things are breaking. It seems like it is mostly people with the stage 2 cams. I haven't really heard of any other setup breaking like that. That is why I asked the original question.

I would love for someone to explain to me how a stage 2 cam can brake a throttle body shaft in half...

Harmonics if that being the case my shit would have blown to bits about 2 years ago. I dont know anyone's bike that has more decel pop than mine.

 

[Big Will]

i wish you guys would stop scaring me... i would be sick if a screw out of a throttle blade or part of a shaft went through our motor...gonna be checking ours closely..

Been there, done that and got the T-Shirt... it sucks ass. I did get my heads ported, polished and oversize valves put in while it was apart though.

 

[vrscdx105]

i too have experienced the broken 58mm TB's issue and i am also running the stage 2 cams and it was running amazing with NO POPS OR COUGHS... had about 600 miles on them and found they were broke.

they are breaking right across the screw holes... i fully believe that if the shafts were made with NO SCREW HOLES and just TIG weld the butterflies right to the shaft there will be an end to the broken shafts... i know fitzgerald 58's already come with the screw tacked right to the shaft... but i fully believe that if the shaft had no holes in them and just plug weld the butterflies right to the shaft from the top that it would have no where to break... ive been welding for 9 years now along with alot of tig work to back me.

 

[Buckeye826]

I believe that a stronger shaft would fix your problem. I have some Ti that I could make a few shafts out of if anyone is interested.

 

[dfhg]

I believe that a stronger shaft would fix your problem. I have some Ti that I could make a few shafts out of if anyone is interested.

Ron,
I am interested in doing what you are saying as I just experienced my first TB failure with 1500 miles on my 1302. I have the 58mmTB and Stage II SCE Cams.
I might do what Big Will suggested and put a stock TB back on.
Looking for suggestions.

Jim

 

[Buckeye826]

I have spoke with Will on this matter. If you have a rod or if anyone has a rod and they could send it to me I have a gun that I can analyze the material of the shaft and see exactly what it is made of and then go from there. I do believe a stronger shaft and hardware will solve this problem.

 

[Jaben2]

Well i am in toledo ohio with two broken shafts. I could send you the whole tb if it means there could be a permanent fix.