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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 13:37 #869254

  • JR
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Hi All,

i'm trying - at a distance - to help a friend get his old 66 Tiumph 650 going again. It has a single roundslide Mikuni VM 34(?) on it . He can get it to run for 5 or so seconds with a shot of starter fluid. He has had sludge / dirt issues and we are thinking the carb is still dirty. 

we believe his pilot jet is a #25. If everything I read online is correct then Mikuni # s refer to flow and to convert this to mm I must divide by 200. This gives me an ID of 0.125mm  which is tiny.

By contrast the pilot in my Keihins are a 35 which means the ID is 0.35mm  and a high E guitar string at .28 mm is pefect for clearing crud but would be way to big for the Mikuni. So what would be good to use on the smaller Mikuni?

Trying to do some homework in advance of seeing the bike which may not be for another week or 2

I know this not a kz issue but also that  many of you have Mikuni carbs and perhaps someone  may have encountered this in the past. 

Alternatively we may be better just identifying for sure what jet is in there and just buying replacement.

Thanks in advance for any advice

 
1980 kz750E1, Delkevic exhaust

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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 14:38 #869258

  • SWest
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A strand from a wire brush.
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 14:51 #869261

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Guitar e string.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 15:07 #869263

  • riturbo
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I use bread ties . You melt the plastic off with your lighter . 
Gpz 750 turbo The one I ride
Gpz 750 turbo Not finished
Gpz 750 turbo Not started
Gpz 550 1981
Gpz 550 1983
Bunch of other junk

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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 15:55 #869264

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Guitar strings, been using them for over 30 years. You can buy single strings from most music stores and they come in a lot of different sizes.....

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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 16:24 #869265

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HE SAID THE HIGH E STRING IS TOO LARGE. 
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 17:24 #869266

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You are right, I overlooked that. My Earnie Ball is .008 inch, which works out to 0.2032mm. Still too big. Guess I never had a jet that small.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 17:53 #869271

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I have both a torch tip cleaner and a micro drill bit set for that purpose.
1975 Z1 900
1994 KX250 Supermoto
2004 KX125

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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 18:34 #869273

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I use this wire set from K&L, with a wide range of wire sizes.  I'm not sure if it goes down small enough.  But I've found it pretty useful.

www.denniskirk.com/k-and-l/carb-cleaner-...p28465.prd/28465.sku
'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100
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What to use to poke out/clear a Mikuni pilot jet ? 23 Jun 2022 20:50 #869274

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I suggest soaking the jets in carb and choke cleaner spray with a top on it over night. A single carb for two cylinders should have a larger pilot jet. Could be the varnish makes it seem smaller. The wire brush strand is smaller than an E string but isn't very strong. 
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
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What to use to poke out/clear a Mikuni pilot jet ? 24 Jun 2022 03:35 #869283

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Thanks guys. Got a few ideas and found some possibilities. Waiting to hear back from him what jet # he actually has in there and will also order a  few replacements. 

 
1980 kz750E1, Delkevic exhaust

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What to use to poke out/clear a Mikuni pilot jet ? 24 Jun 2022 07:54 #869290

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A single strand from a bicycle brake/shifter cable. 
Don't be ridiculous! It's only a flesh wound!

Wife's little bike... 1984 GPZ 550 Kerker and DynaJet stage I kit
Wife's BIG bike...... 1981 GPZ 1100 Kerker and factory FI Mikuni RS34s W/ K&N pods

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