Where to find M17x1.25 bolt?

I'm thinking of adding an oil cooler to my 750, and the way you do this is to either buy the rear fitting from Klasmo or American Classix, or make it yourself from a M17x1.25 bolt. Being a DIY kinda guy (read "poor"), I favor the latter option. Just one problem: Seems nobody makes a bolt in that size! Do I have to start with plain bar stock and thread it myself?

Try allen fastners they have a large selection. They are online. google them.

No dice.

No 17mm bolts, either.

what is the thread size? B)or is it 17mm thread? seems awfully big for thread size

PLUMMEN wrote:

what is the thread size? B)or is it 17mm thread? seems awfully big for thread size

1.25

Metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter and the pitch, both expressed in millimeters and separated by the multiplication sign, × (e.g., M17×1.25).

I just measured mine I think it might be an 18 not totally sure but but when I measured it it was larger than 17

Maybe look for banjo bolts in that size.

There doesnt appear to be a 17mm in any standard. Either 16 or 18 mm.

Like I said earlier I think its an 18. Seems like its more common.

From the archives:

kzrider.com/archive/viewthread.php?fid=2...146&action=printable

Pre-1980 KZ650s had an 18mm plug, post-1980 KZ650s and all 750-4s had the 17mm plug.

Go here , and about halfway down the page you'll find...

Oil Cooler Adapter Kit to connect an oil cooler to the KZ650 engines. Mounts to the oil port underneath the points housing or to the port underneath the alternator cover, return line is connected to the oil pan with the second adapter. Determine the correct kit by checking the plug screw diameter (see sample picture, "click here"), and order kit OCA650-17 or OCA650-18 as needed.
Code: OCA650

Price: $ 74.50

The info from the archives is years old, and I know other KZ owners have done this mod... so where did they get the 17mm bolt??

That archive link is acting sorta dodgy, here's the info contained within:

Alternate Solution to Klazmo Oil Cooler Fittings
Murphyau - 21-5-2004 at 00:12

Some time ago, before I found the Klasmo fitting, I was given some advice on how to make my own oil cooler engine fittings. It is not difficult but you do need to use a metal turning lathe.

Fortunately, when I originally placed my order on Klasmo, I ordered some additional spare fittings, so the following measurements are taken directly from these fittings today using a venier gauge.

As you can see from the photos below, the Klazmo fittings are one piece cast and machined items, of quiet good quality BUT you can make an equivalent item out of a standard bolt and a standard threaded hose spigot.

The fitting used (both front and rear) are all metric.
M18x1.5 means it is a metric 18mm bolt with a 1.5mm thread pitch.
M17x1.25 means it is a metric 17mm bolt with a 1.25mm thread pitch.

FRONT FITTING
This is a standard industry item and is a M18x1.5 bango fitting. The bolt section is 32mm long (measured from the underside of the head to the end of the bolt. These should be available at any good industrial supply / hose company. This fitting (M18x1.5) is the same of all models of the KZ650 and KZ750 four cylinder engines.

REAR FITTING
There are two types of rear fitting. They are similar but there are some important differences.

Firstly, determine which fitting you need. Have a look at the RH rear corner of the existing oil pan. If there is a stadard bolt head plug, then you need the M18x1.5 rear fitting. If there is a Socket head / Allen head plug, then you need the M17x1.25 fitting.

Early model KZ650, up to approx mid 1979, used the M18 fitting while the later model KZ650, from mid 1979 onwards, and all KZ750 used the M17 fittings. You need to be sure what size is required, so look at your oil pan.

M18 REAR FITTING
NOTE: ALL MEASUREMENTS ARE TAKEN FROM THE UNDERSIDE OF THE BOLT HEAD.

• Obtain a standard M18x1.5 bolt.
• Cut the bolt so that it is 35mm long, measured from the underside of the bolt head.
• Drill a 8mm hole, through the centre point of the bolt head and down the long axis of the bolt. The hole sould be 27mm deep. It should NOT go all the way through the bolt.
• Machine a "waist" section 9mm wide, starting 11mm from the underside of the bolt head. This "waist" section should be 9mm thick at its narrowest point.
• Machine down the end of the bolt, after the "waist" section, so that it is 9mm wide and 16mm in diameter.
• Machine a 4mm wide chamfer at the very end of the bolt.
• Drill a 6 mm hole complete through the "waist" section, from one side to the other. The centre for this hole is 17mm from the underside of the bolt head.

M17 REAR FITTING
NOTE: ALL MEASUREMENTS ARE TAKEN FROM THE UNDERSIDE OF THE BOLT HEAD.

• Obtain a standard M17x1.25 bolt.
• Cut the bolt so that it is 38mm long, measured from the underside of the bolt head.
• Drill a 8mm hole, through the centre point of the bolt head and down the long axis of the bolt. The hole sould be 28mm deep. It should NOT go all the way through the bolt.
• Machine a "waist" section 9mm wide, starting 14mm from the underside of the bolt head. This "waist" section should be 9mm thick at its narrowest point.
• Machine down the end of the bolt, after the "waist" section, so that it is 9mm wide and 13mm in diameter.
• Machine a 4mm wide chamferat the very end of the bolt.
• Drill a 6 mm hole complete through the "waist" section, from one side to the other. The centre for this hole is 17mm from the underside of the bolt head.

Once you have machined up your bolt to match the appropriate sizes for your oil pan, obtain a standard spiggot hose fitting. You want is a spiggot fitting that has a threaded section on one end. The threaded section should be approx. 10mm long and the Inside Diameter (ID) of the spigot should be at least 8mm

• Drill and cut a thread into the bolt head to match the thread pitch of the hose spigot.
• Apply some high tempurature nylon pipe tape to teh spigot's thread and screw the spigot into the bolt head.

There you go, one rear oil cooler fitting. Time to fit it to your bike.

Let me know if there are any questions.

[Edited on 21-5-2004 by Murphyau]

Whatever happened to Murph, anyhow?

www.boltdepot.com/
www.md-metric.com
www.mrmetric.com
www.winkfast.com
www.specialtytoolandbolt.com/fasteners.html

All I can think of at the moment...................