Topic: Damaged thread repair for a hard-to-find part?

[Tugboat]

I'm currently rebuilding a CB500 for a customer that was totally in pieces when I got to it. Been looking for one of these (and its counterpart) since June and finally just took 'em off a parts bike at the shop that's not mine. It's another CB500 they bought for $75 in terrible shape w/ no title. Will sort that out at some point... The bolt is for the brake torque arm and is unavailable OEM.

So, if you look at the very beginning of the threads - to the far left, about 1/2way down the bolt - the threads are damaged there. Folded into the ridge below it. I thought about just grinding the tip past where the damage is, but there's a hole in this bolt for a cotter pin and I think that if I gound it down I'd lose too much metal. Is there any way to repair the threads?

[phil71]

isn't that just a brake stay bolt? get a new one. I think you're not looking hard enough, forget OEM, that brake setup was on a zillion bikes.

[Tugboat]

It is. So what you're saying is I could find one that would work off pretty much any 70's J-Bike?

[bollingball]

It would not be hard to make. It is just a shoulder bolt with a long shoulder.
What is the counter part you speak of? The part it screws into?
phil71 may be correct about it being on a lot of bikes. Do a cross reference here.

http://www.powersportsplus.com/parts/detail/honda/HP-16952-388-015.html

[Kevin D]

Western Hills Honda:
http://www.westernhillshondayamaha.com/Default.asp

Thread File:
http://www.webbikeworld.com/motorcycle-tools/thread-file/

Or just use the edge of a small half round file to clean up the damaged area. Threads look OK where the nut rides. Just gotta get it down there so the clip/cotter can hold it on.

[paulages]

A thread file should clean that up fine, especially since you only need to get past the damaged section to where the nut actually sits. Still, that part is easy enough to find new.

[m in sc]

grind down w/a taper shape at the end part and run an m8 die over it. that's a 5 minute repair. theres no load ont he threads, its all on the shoulder anyway

[splitt]

I've used a needle file set to dress up threads on hard-to-find parts. The 3-square and half-round files work best.

Here is the set I have:

http://www.craftsman.com/shc/s/p_10155_12602_00906757000P?vName=Hand+Tools&cName=Cutting+%26+Finishing+Tools&sName=Files+%26+Rasps&prdNo=2&blockNo=2&blockType=L2

[Kanticoy]

+1 on filing it, I do it all the time on bolts.

[crazypj]

I'm currently rebuilding a CB500 for a customer that was totally in pieces when I got to it. Been looking for one of these (and its counterpart) since June and finally just took 'em off a parts bike at the shop that's not mine. It's another CB500 they bought for $75 in terrible shape w/ no title. Will sort that out at some point... The bolt is for the brake torque arm and is unavailable OEM.

So, if you look at the very beginning of the threads - to the far left, about 1/2way down the bolt - the threads are damaged there. Folded into the ridge below it. I thought about just grinding the tip past where the damage is, but there's a hole in this bolt for a cotter pin and I think that if I gound it down I'd lose too much metal. Is there any way to repair the threads?

I'm currently rebuilding a CB500 for a customer that was totally in pieces when I got to it. Been looking for one of these (and its counterpart) since June and finally just took 'em off a parts bike at the shop that's not mine. It's another CB500 they bought for $75 in terrible shape w/ no title. Will sort that out at some point... The bolt is for the brake torque arm and is unavailable OEM.

So, if you look at the very beginning of the threads - to the far left, about 1/2way down the bolt - the threads are damaged there. Folded into the ridge below it. I thought about just grinding the tip past where the damage is, but there's a hole in this bolt for a cotter pin and I think that if I gound it down I'd lose too much metal. Is there any way to repair the threads?

Your 're building' for a customer but don't know the first thing about where to get parts and the fact the it's a common item, even today?
Honda probably still have about a gazzillion of them, they fit just about any drum brake bike.
 Does not inspire confidence

[Frostyboy]

David Silver has one if you really want a new one.

http://www.davidsilverspares.co.uk/parts/by-part-number/partnumber_8400/

[dave500]

what a kerfuffle,is it a concours bike?,got a box of bolts?,make something fit.

[m in sc]

...and next time you tap a bolt out w/a hammer..... try not to smash the threads.... use a punch if you must.
.02

[754]

Dave, I am calling bad advice on that one..

 The bolt is important. Using anything else  wont work the same. It is engineered to fit hole in brake arm Without knawing on the bore with  the threads. Also a very important function IMO, is to allow the brake backing plate to rotate rearwards to allow rear wheel removal. So the stock part works well. OIther parts dt fit right, if the fit the head end the thread part is a wrong fit..
 I dont think its hammer damage, its wrong pitch fastener started on there, did that..
 God bless thread files, they rule the tool box..

[phil71]

no brakes can kill you. Use new parts.

[m in sc]

there no load on the thread, just repair it and go. that wont kill you. and yes, thats a hammer blow, no doubt.

[dave500]

Dave, I am calling bad advice on that one..

your right 754,i could pull it off but others might not be able to.

[Tugboat]

Thanks for all the responses. This is my first rebuild for a shop that normally does choppers (Harley, Norton, Triumph) and they don't have a Honda guy there. This is basically a paid internship. Plus, I'm doing it after hours when nobody else is there so I don't have anyone else to ask about these things.

Definitely going to find a thread file and try to repair.

[bollingball]

Tug If I were the owner I would rather be charged for a new bolt.

[crazypj]

Thanks for all the responses. This is my first rebuild for a shop that normally does choppers (Harley, Norton, Triumph) and they don't have a Honda guy there. This is basically a paid internship. Plus, I'm doing it after hours when nobody else is there so I don't have anyone else to ask about these things.

Definitely going to find a thread file and try to repair.

 Just get a new one.
 Go to a junk yard if you don't want to pay 'new' prices

[vames]

Is it really impossible to find? You could probably go to your local Honda Dealer's part desk and ask for part # 90133-256-000

Or order one from HondaParts-Direct.com or any other OEM dealer

(see #19 on the chart) -- listed for $2.76

http://www.hondaparts-direct.com/fiche_section_detail.asp?section=122867&category=MOTORCYCLES&make=HONDA&year=1972&fveh=2936

[Tugboat]

Local dealer said they couldn't get it or the bolt that goes on the other end of the torque arm.

[crazypj]

Look at Honda Rebel or any of the drum brake bikes (you usually have to walk past rows of bikes on way to parts dept) 

[Frostyboy]

Definitely going to find a thread file and try to repair.

It doesn't look to me like that thread has enough meat at the business end. (Unless the nut ges on past the damaged section.) I wouldn't be using it unless I drilled a hole through it & used it as a sinker for a fishing line.

Is it really impossible to find? You could probably go to your local Honda Dealer's part desk and ask for part # 90133-256-000

Or order one from HondaParts-Direct.com or any other OEM dealer

(see #19 on the chart) -- listed for $2.76

http://www.hondaparts-direct.com/fiche_section_detail.asp?section=122867&category=MOTORCYCLES&make=HONDA&year=1972&fveh=2936

The part # is actually 90133-286-000 & Silvers still show as having one. (ref my previous post.)

[754]

 I still say it is not hammer damage..
 BIG QUESTION;
 Why would anyone hammer one out ??
 To chrome or polish orP0coat is the only reason to hammer on it.
 I just remove nut/cotter.. then pull brake arm off the bolt and push out of the way..