bolt threads?

[jordraatt]

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

[rustybronco]

The pictures to small to see what bolt you are referring to. Also, what bike is this bolt used on?

[Steve]

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.

.

[rustybronco]

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

One cannot 'fix' the threads without knowing the threads pitch.

[jordraatt]

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

[rustybronco]

1982 gs650g... 12MM X 1.25

[jordraatt]

thank you so much "rustybronco"!! you saved my day..

[Steve]

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.

.

[jordraatt]

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 ****

[rustybronco]

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.

[jordraatt]

yes, i'm looking at this helicoil repair kits on ebay.. you drill a new hole and insert new threads.. any experiences??

[rustybronco]

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?

[jordraatt]

i'm not quite sure what you are aiming for here.. my english is not so good, because i'm from Norway..

if this picture turns out good, you can see where i'm going to repair the threads.. looks like it's not going to be a problem using helicoil repair kit

this is the kit i'm planning to use: http://www.ebay.com/itm/TIME-SERT-NE...ec2dca&vxp=mtr

[GateKeeper]

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...

[rustybronco]

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.