Pressed slow jets removal

piit · Post by **piit** » Mon Dec 28, 2009 3:28 am

Hi, any hints for slow jets removal. New slow jets exist. Cheers, piit

daves79x · Post by **daves79x** » Mon Dec 28, 2009 7:36 pm

It's probably been covered here before, but here goes: 3mm will work, but SAE 4-40 is a better fit. Anyway - you need a screw of either of the above sizes, nut and a couple of washers. Then you need to tap the pressed-in jet a few threads. You don't have to drill a pilot hole, the jet has several mm of 'pilot hole' already drilled in it, before you get to the actual #35 passage. I've had a couple of guys tell me that the 3mm was pretty hard to get tapped without drilling out a bit, but the 4-40 will tap very easily.

Anyway, get as many threads tapped into the jet as possible, thread the nut up on the screw, put a washer on and then screw the assembly down into the threads you tapped. The tower the jet is pressed into makes a perfect pulling platform. Just tighten the nut down on the tower and the jet will pull right out. I've never ruined a jet this way and never had one I couldn't get out. And I've removed dozens of them.

Then you can properly clean the jets and the passages behind it. Just make sure you get all the debris blown out of the carb body. Then you need a small brass drift to reinstall. Just tap them back in with the drift. Good luck

Dave

EMS · Post by **EMS** » Mon Dec 28, 2009 9:18 pm

You are re-using the same jets you tapped, Dave?

piit is in Finland, so he shouldn't have a problem, but here in the States it may be a challenge to find a 3mm screw and nut. The smallest my "go-to" hardware store has is 4mm

alimey4u2 · Post by **alimey4u2** » Tue Dec 29, 2009 5:41 am

If you're looking for small don't forget the BA thread range...

http://www.pollymodelengineering.co.uk/ ... /tools.asp

daves79x · Post by **daves79x** » Tue Dec 29, 2009 7:04 am

I'm saying that 4-40 hardware is perfect without drilling out the pilot part of the jet (that can be tricky). 3mm is a bit larger and MAY require drilling the jet a bit larger (just the pilot portion - not the #35 passage). As I said, there are several mm of pilot or tapping hole to work with before you actually get to the #35 passage.

The jets are perfectly reusable once cleaned and de-burred.

Dave

piit · Post by **piit** » Tue Dec 29, 2009 7:10 am

daves79x, thanks for the instructions! I tried to search this topic but could not find...I know I have seen it somewhere, but maybe not in details like now

BR, piit

Goss · Post by **Goss** » Tue Dec 29, 2009 9:59 am

Piit,

3mm worked perfectly for me, it was a shock to see how small the jet holes are when I got them out.

Regards

Goss

piit · Post by **piit** » Tue Dec 29, 2009 11:59 am

Hi Goss, thanks for this confirmation! Were the holes partly blocked in your case? BR, piit

Goss · Post by **Goss** » Tue Dec 29, 2009 1:49 pm

Piit,

Completely blocked and the air passages to and from them. I had to heat them up with a tourch to burn off the crap then use very small diameter wire to clear them. I was told to use the single strand if wire from my wire brush but this was too thick so stripped some electrical cable!

I am looking for a good in line filter so there will be little chance if this happening again, when you see them you will probably agree.

Regards

Goss

Mike Barone #123 · Post by **Mike Barone #123** » Tue Dec 29, 2009 4:42 pm

Piit

Call me forgetful in advance, but how did your Kosman rim project work out. I think I saw your post about it and a pix....so sorry about asking if you already brought us up to date.

Mike

Goss · Post by **Goss** » Wed Dec 30, 2009 6:28 am

Goss wrote:Piit,

3mm worked perfectly for me, it was a shock to see how small the jet holes are when I got them out.

Piit,

I have found the receipt for the 3mm tap to find that I purchased a 2.5mm drill bit with it so I probably did drill the holes out very slightly as I used the second stage tap only. I would have drilled down into the jet 6mm deep then tapped them. I used a 3mm allen head with the key as it gave me better control.

Hope this helps.

Goss

daves79x · Post by **daves79x** » Wed Dec 30, 2009 6:38 am

Yes, I've heard that the 3mm is a bit large to tap without drilling, You probably can't get 4-40 hardware over there, but it works perfectly without drilling.

Once extracted, you are exactly right, Goss. Just heat the jets with a torch and the goo inside will boil and crystallize. It can easily be pushed through and cleared. Motion Pro makes a set of jet cleaners/sizers for about $10. They come in a case like torch tip cleaners. The smallest is a #35 and I've practically worn that one out. Really handy for sizing them also to see if a PO has drilled them out.

New #35 pressed-in jets are available form Sirius in Canada if you need them. Good luck.

Dave

piit · Post by **piit** » Thu Dec 31, 2009 5:48 pm

Thanks to all for tapping information. I have new jets bought from US ebay and if remember right from Sirius. I will write how the removal went planning to do it before March. Currently I am fitting both FZR1000 and XJR1300 rear swingarm and also FZR1000 USD front end to my 79. Some works still to do

Cheers, Pete

Jeff Bennetts · Post by **Jeff Bennetts** » Thu Dec 31, 2009 5:55 pm

Hey piit, if you bugger up the carb nozzles when you remove them for cleaning they are available from Sirius too.

Keep us posted on your build.

jb

EMS · Post by **EMS** » Thu Dec 31, 2009 10:22 pm

piit wrote: . Currently I am fitting both FZR1000 and XJR1300 rear swingarm and also FZR1000 USD front end to my 79. Some works still to do Cheers, Pete

How the heck are you fitting two swingarms into one bike