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Post subject: Keihin jets length
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| Rich |
I just bought a few keihin main jets from Wemoto so I can fine tune the PWKs on my yamagamma but when they arrived, they are 9mm long and not 8mm as stated. This means they will just touch the inside of the float bowl so it cannot be fitted properly. They are otherwise identical to the ones I removed. Anyone else has this problem? It's hard to spot without measuring the length of the jets. The part number for these jets should be 99-101-393 but Wemoto said they have no data for the length and have not come across this before? However, they are going to refund me no problem. I have just ordered some replacements from Allens so hope they get here before the dyno day on Saturday!
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Posted: Wed Jul 23, 2008 4:27 pm
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| Rich |
Some pics
Existing jets on left, the Wemoto ones on the right
http://img.photobucket.com/albums/v149/richyamaha/jets2.jpg
http://img.photobucket.com/albums/v149/richyamaha/jets1.jpg
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Posted: Wed Jul 23, 2008 6:24 pm
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Thrasherg  Powerband Master Joined: 18 May 2007 Total posts: 649 Location: Austin, Texas |
I would really question how well the standard jets will flow, if you have less than a mm between the jet and float bowl, that doesn't leave a lot of room for the petrol to flow in and go up the jet!! I don't know what the solution is, but that is a very small clearance to have inside the carb.
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Posted: Wed Jul 23, 2008 6:26 pm
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| Rich |
The bottom of the float bowl isn't flat, it has a round recess in the centre and the bottom of the jet sits inside this recess in a pool of fuel. However, in the recess are various castings for the drain screws etc and the edge of the jet is norrmally just above one of these castings. The longer jet touches it and just stops the bowl from seating against the carb body. tricky to explain so I'll grab some pics later 
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Posted: Thu Jul 24, 2008 9:04 am
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kenny Mmm, Fully Synthetic! Joined: 03 Aug 2003 Total posts: 1457 Location: Worcestershire |
you could have just filed the bottom of the jet down a tad.
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Posted: Thu Jul 24, 2008 9:07 am
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z1100r Ace of Spades Joined: 05 Aug 2003 Total posts: 4663 Location: Coventry |
Are they original Keihin anyway...if not dont bother with them. The Allen ones are genuine...but expensive.
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Posted: Thu Jul 24, 2008 9:10 am
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| Rich |
| kenny wrote: |
| you could have just filed the bottom of the jet down a tad. |
Could have done but the size is stamped on the bottom face 
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Posted: Thu Jul 24, 2008 9:17 am
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| Rich |
| z1100r wrote: |
| Are they original Keihin anyway...if not dont bother with them. The Allen ones are genuine...but expensive. |
Yeah, reckon I'm in for a nasty shock - I forgot to ask the total cost before I put the phone down 
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Posted: Thu Jul 24, 2008 9:22 am
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Post subject:
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| Rich |
| Rich wrote: |
| z1100r wrote: |
| Are they original Keihin anyway...if not dont bother with them. The Allen ones are genuine...but expensive. |
Yeah, reckon I'm in for a nasty shock - I forgot to ask the total cost before I put the phone down |
Well, bu99er me Allens genuine jets are the same price as the ones I bought from Wemoto - £2.95 each. Top service too- phoned yesterday pm and they arrived today 
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Posted: Thu Jul 24, 2008 6:29 pm
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kookimonsta Rear-wheel Steering! Joined: 16 Dec 2003 Total posts: 2647 Location: Wolverhampton, West Mids, UK |
just a stab on the dark but theycould be medium delotro jets? will have a look in my book tomoz if i remember.
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Posted: Thu Jul 24, 2008 7:49 pm
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z1100rAce of Spades Joined: 05 Aug 2003 Total posts: 4663 Location: Coventry |
Yeah but thats expensive....when you have to buy 4 of each and from 120's to 170's
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Posted: Thu Jul 24, 2008 10:51 pm
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