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bolt threads?

  • Thread starter Thread starter jordraatt
  • Start date Start date
J

jordraatt

Guest
Anyone who knows the measurements/data on bolt number 6 in this image??

I'm going to fix the threads in the hole, and have to use a setscrew.. So what threads are there on this bolt??

Sincerely
 
The pictures to small to see what bolt you are referring to. Also, what bike is this bolt used on?
 
If you look up that bolt in the parts fiche, the size of the bolt is encoded in the second half of the part number.

If the part number is xxxxx-0520x, for example, that would be a 5 x 20 mm bolt.

.
 
oh, sorry.. it's the bolt holding the flywheel and the starter clutch..

the bike is a gs650g Katana, 1982..

i haven't got a thread gauge, so i can't find out the thread pitch or the thread diameter.. and i'm in a hurry
 
As I had pointed out, if you had looked up the part number, you would find that it is 01107-12458.
Right there, in the second half, you will see that it is a 12mm bolt that is 45mm long.
Doesn't do much for giving you thread pitch, but that is the bolt size.

.
 
thanks for the information "steve", i'll know that for later.. in this case the thread pitch was important though.. now i can buy the right thread tap and fix this **** :)
 
Buy a 'good' tap. The cheap ones don't have enough of a taper at the end.
and, be very careful you have the tap perfectly centered.
 
yes, i'm looking at this helicoil repair kits on ebay.. you drill a new hole and insert new threads.. any experiences??
 
On a crank shaft bolt you have very little clearance between the hole in the rotor and the rotor bolt. Can you make some sort of drilling fixture that uses the rotor as a point of reference? or is the rotor already removed?
 
I think you will be fine, seems to be a lot of meat left in there, just use the proper size drill and tap for the helicoil and you should be fine

if you need to repair just the one hole, can you not just get the one drill tap and helicoil, check with your closest machine shop, perhaps they can lend you a hand, or lend you the drill and tap, tell them if you damage it you will replace it, could be a cheaper alternative

check your local nut and bolt supply company they might have the helicoil you need as well ?

and make sure you use some loctite on the helicoil once you start putting it in...
 
Your English is just fine.

What I'm getting at is, make sure you drill the hole EXACTLY in line with the existing bolt hole. That crank is capable of spinning up to and beyond 9,000 RPM's. If you drill the hole and insert the heli-coil off center, the bolt used to retain the rotor will create an imbalance and could create undesireable vibrations.

I see you have taken the rotor off, that's good. That way you don't need to worry about the outer diameter of the heli-coil being too large to insert through the hole in the rotor.
 
If you are not well experienced with Helicoils, do a couple of practice installations into another piece of steel. Drill a hole then run the Helicoil drill, Helicoil tap and then insert. Doing the first try into a crankshaft might not be the ideal means of discovering that you are making some error of understanding. You will have one try to be successful and then things will turn nasty.

Helicoils appear to be a very simple installation but many things can go wrong. Someone mentioned the use of Loctite to assist in holding the insert. Not really required but something many of us prefer.

It is not uncommon for the insertion tool to be a poor fit which can make it difficult to impossible to install the insert. I've seen several kits with this problem in the last few years so be aware that you may have problems in this regards.

It is sometimes helpful to chamfer then starting end of the threads before attempting to install the insert, particularly when installing sparkplug coils.

Good luck with the repair. Wondering what happened to destroy that thread (as this is not a common problem)?
 
okey, thank you very much guys.. this forum saves me every time, it's amazing!! you are right, looks like it's enough metal for a helicoil in there..

you are right about that, it must be very important to get it in center..

this bike is a project i have been working on for months now.. it's going to be a bad-ass, old school bobber with hardtail.. and it is almost done now.. going to make a post with photos on the project soon :)
 
Normk said:
If you are not well experienced with Helicoils, do a couple of practice installations into another piece of steel. Drill a hole then run the Helicoil drill, Helicoil tap and then insert. Doing the first try into a crankshaft might not be the ideal means of discovering that you are making some error of understanding. You will have one try to be successful and then things will turn nasty.

Helicoils appear to be a very simple installation but many things can go wrong. Someone mentioned the use of Loctite to assist in holding the insert. Not really required but something many of us prefer.

It is not uncommon for the insertion tool to be a poor fit which can make it difficult to impossible to install the insert. I've seen several kits with this problem in the last few years so be aware that you may have problems in this regards.

It is sometimes helpful to chamfer then starting end of the threads before attempting to install the insert, particularly when installing sparkplug coils.

Good luck with the repair. Wondering what happened to destroy that thread (as this is not a common problem)?
Click to expand...

thank you very much for your tips, i'm going to practice first.. there's no room for errors here..

what happened, was that it got damaged under the flywheel removal.. as many of you might know, it is often a pain in the ass to remove the flywheel on this bike.. i ended up with installing a bolt in the inner hole, and used a puller.. the bolt apparantly was a LITTLE bit too small, and the threads got damaged.. i was shocked about how stuck the flywheel was, i mean, the puller had to use a lot of force.. and the flywheel fled off with a bang!!
 
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