Stripped pilot threads

More
01 Sep 2006 16:39 #73931 by bharper6649
Stripped pilot threads was created by bharper6649
The pilot jets in my carbs(Mikuni VM28)have always seemed to just barely fit. Only a couple threads caught before the jet was seated. Well today while rejetting that last thread let go in one of the pilots. Should I try to repair or will I need to replace the carb? If I can repair what are my options for such a small hole?

Any help will be appreciated.

1974 Z1 900
4-2 Exhaust, Pods
Dyna Ignition and Coils
WG Coil Mod

Please Log in or Create an account to join the conversation.

  • mark1122
  • Offline
  • User
  • Keep twisting it
More
01 Sep 2006 16:48 #73936 by mark1122
Replied by mark1122 on topic Stripped pilot threads
You may be able to use a glue of some kind.Try an autimotive suply store .Maybe a locktite product?If it a permanant type glue it wont matter once you have the jetting right you shouldn't have to change it again anyways.Theres a posibilty you could get a heli coil.Shoot a message to wiredgeorge he works on carbs all the time.

76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)

Please Log in or Create an account to join the conversation.

More
01 Sep 2006 17:48 #73947 by wiredgeorge
Replied by wiredgeorge on topic Stripped pilot threads
I believe you can fix it. Not positive as I haven't done it but I think a 4mm .7 pitch insert will fix the thread. You will have to drill the old thread out using a drill bit recommended by the insert manufacturer. Then thread the insert in and I suggest using some red loctite. That should fix it. Be careful with the drill to keep it dead-straight as there isn't much material to work with.

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

Please Log in or Create an account to join the conversation.

More
01 Sep 2006 18:08 #73956 by bharper6649
Replied by bharper6649 on topic Stripped pilot threads
Where can I find the inserts? I looked around on the web and cant find a 4mm insert at autozone or pepboys. Is there a specific store I can check out?

1974 Z1 900
4-2 Exhaust, Pods
Dyna Ignition and Coils
WG Coil Mod

Please Log in or Create an account to join the conversation.

  • Biquetoast
  • Offline
  • User
  • King Jeremy The Wicked
More
01 Sep 2006 18:33 #73964 by Biquetoast
Replied by Biquetoast on topic Stripped pilot threads
bharper6649 wrote:

Where can I find the inserts? I looked around on the web and cant find a 4mm insert at autozone or pepboys. Is there a specific store I can check out?

I got the same recommendation from WG about my float bowl screws a while back, and he mentioned "Recoil" systems, so I tried it. Great system. You can buy the "kit" which comes with the tap and insert and insert tool. You use your own drill. I buy my ReCoil kits from Maryland Metrics . I've bought two different ones now....

(1.) '75/'76 KZ400D - Commuter
(2.) '78 KZ750B3 Twin - Commuter
(3.) '78 KZ750B3 Twin - Commuter
(4.) '75 KZ400D - Sold
kz750twins.com

Please Log in or Create an account to join the conversation.

More
01 Sep 2006 21:28 #73997 by wiredgeorge
Replied by wiredgeorge on topic Stripped pilot threads
Sorry, I forgot to mention Maryland Metrics. When you call, ask for Scott and tell him I sent you (George Lesho aka wiredgeorge). It is best to order the kit which includes a tap (special size), the install gizmo and some inserts. I suggest you take the suggested drill bit very seriously and don't use some other size that looks right (don't ask how I came by this knowledge). You can also buy more inserts (refills) for the kit. I keep 4mm and 6mm kits stocked and need to get a 5mm kit and an 8mm kit at some point. They are also a great source for stainless socket head stuff as well as metric orings. They are the only place I know that can get 20mm (thin) countershaft sprocket nuts, 12 x 1.25 taps and dies (comes in handy for cleaning thread on shock mount studs) and metric exhaust studs.

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

Please Log in or Create an account to join the conversation.

More
02 Sep 2006 06:12 #74033 by bharper6649
Replied by bharper6649 on topic Stripped pilot threads
I missed my opportunity to call the place, so I will have to wait until Monday to order the kit. I didn't see prices anywhere. Can anyone give me an idea of the cost for one of the kits.

Thanks for all the help!

Bryan

1974 Z1 900
4-2 Exhaust, Pods
Dyna Ignition and Coils
WG Coil Mod

Please Log in or Create an account to join the conversation.

More
02 Sep 2006 07:52 #74042 by wiredgeorge
Replied by wiredgeorge on topic Stripped pilot threads
Probably will be Tuesday. I can't recall pricing... sorry. I just buy replacment inserts and the kit was ordered quite awhile back. Here is a price I found on the net:

www.storesonline.com/site/600195/product/RE-35040

You can do a google search as follows:

+M4 +Recoil +"thread insert"

This search will turn up various sources for the Recoil kit. Other insert types are Helicoil, Timesert and Keysert.

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

Please Log in or Create an account to join the conversation.

  • Biquetoast
  • Offline
  • User
  • King Jeremy The Wicked
More
02 Sep 2006 08:22 #74049 by Biquetoast
Replied by Biquetoast on topic Stripped pilot threads
bharper6649 wrote:

...Can anyone give me an idea of the cost for one of the kits...


The Recoil 4x0.7 (53040) kit I bought in January cost $33.28, and I got an extra 10 inserts (the kit came with 10 as well) for an extra 4.46. Shipping was 7.52. Grand total of 45.26. I emailed the sales email address, got a price and used the online form to submit.

I ordered another different sized kit via their online form a couple weeks ago, and while looking for the price, I noticed they never billed me for it and I haven't got anything yet... drat... I'd better contact them...

(1.) '75/'76 KZ400D - Commuter
(2.) '78 KZ750B3 Twin - Commuter
(3.) '78 KZ750B3 Twin - Commuter
(4.) '75 KZ400D - Sold
kz750twins.com

Please Log in or Create an account to join the conversation.

More
02 Sep 2006 18:24 #74146 by arobsum
Replied by arobsum on topic Stripped pilot threads
i messed up a hole on one of the arms that pulls the needle assy up on my vm28's. i filled the hole in with quicksteel, let it set then drilled it out. worked like a champ. been using the carbs on my 77 kz1000 for a couple years now with no obvious side effects. maybe you could do this...then tap it out. with no more pressure then is on these jets, it should work. good luck.

Please Log in or Create an account to join the conversation.

More
12 Sep 2006 13:41 #76156 by bharper6649
Replied by bharper6649 on topic Stripped pilot threads
The recoil kit worked like a champ. The hardest part was cleaning the shavings out of the pilot hole.

Thanks everyone!

:)

1974 Z1 900
4-2 Exhaust, Pods
Dyna Ignition and Coils
WG Coil Mod

Please Log in or Create an account to join the conversation.

More
13 Sep 2006 05:49 #76326 by wiredgeorge
Replied by wiredgeorge on topic Stripped pilot threads
Thanks for getting back and providing feedback. I wasn't sure how the insert would work as I haven't done this repair, oddly... with all the hundreds of sets of carbs, I have yet to see one with stripped thread in the pilot well. I thought it would work as the tap isn't very much bigger than the hole was. Did you have to drill any or were you able to just use the tap to cut the thread for the insert? I use the 4mm inserts all the time for float bowls so I buy them in bulk. LOTS of stripped float bowl bolt hole thread...

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

Please Log in or Create an account to join the conversation.

Powered by Kunena Forum