Jetting

Are ya having a problem with your rig? We'll try to help. Share your tech tips and experiences here. Dr. Billy Glaser, author of the "Unofficial 750 Ural Service Manual" site myural.com, is moderating this section.
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Here is the place for you to ask questions about or share your experiences about servicing or repairing your Ural or Dnepr. Please post topics concering modifications or accesories in the "Modifications and Acessories" section. Please post oil related questions in the "Oil Threads" section.

Jetting

Postby Rickus » Mon Jul 02, 2012 10:45 pm

Well I fiddled with my Ural all day and pretty much got nowhere. I installed the 42.5 pilot jets (Mikuni Crabs) and once the engine warms up, it accelerates pretty well. Until it warms up though it will pop and fart like crazy when I twist the throttle. The idle air screws are turned out three turns. Main jets are 135 with the clip in the center groove. Big problem is once I get to 50 mph it feels like the bike wants to die out and I still have throttle left. So today I double checked my timing, pulled the jets to make sure they were the same in both carbs, and used my home made manometer to tune the carbs. Tomorrow I will be double checking valve clearance. If the high end doesn't improve I plan to go to 137 main jets. Anyone agree/disagree with my attack plan? Oh yea, one thing I did accomplish today. Got one heck of a headache! :(
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Re: Jetting

Postby IAURAL » Tue Jul 03, 2012 12:19 am

Pilot jets at 42.5 sounds OK
Main jets at 135 is a bit big unless you've changed your exhaust? 130's might be better
Air screws out 3 turns?? Why? Shouldn't be any more than 1.5; easy enough to do, try that!
Clip in the center groove? What? Did you replace the stock needles with Gossie needles? If that's the case, then all bets are off and ignore whatever I said. You've got a waay different environment now!
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Re: Jetting

Postby commiezilla » Tue Jul 03, 2012 12:28 am

Someone explain Gossie needles to me. :foilhead:
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Re: Jetting

Postby doug » Tue Jul 03, 2012 11:03 am

commiezilla wrote:Someone explain Gossie needles to me. :foilhead:


The Ural dealer in the Netherlands, Jan Gossie (?) developed a set of replacement needles tapered specifically (taper is very much the key) for the Ural that are a drop in replacement. I have had them for over two years and 14,000 kilometers now and they are without question the best performance mod I have done on my rig. They are tapered and sized to work with the original factory jets so you don't have to mess around changing and tuning jets. Drop them in and be done with it; your rig will run noticeably stronger/better at all throttle ranges, no more farting or popping. If you search the Modifications forum under Gossie Needles, you will find information to order them and pictures of them compared to standard needles. The picture that Nemec posted of them clearly shows the difference in taper from stock. Jan has a Paypal account set up and they run less than $80 for a pair (depending on the exchange rate) including standard shipping which takes about 10 days. I actually think the exchange rate is more favorable than when I bought mine so it may be closer to $60. Some of the tightwads on the forum crow about the price and say they can get aftermarket needles from the local Harley dealer or elsewhere on line for $40 or less. Great for them, but they never post a part number and say you have to find them, try them, see what works best and so on. THESE WORK and work very well. For me, the $75 was one of the best investments made. A couple guys did have trouble with them wearing away up near the retaining clips but myself and several others using them never experienced the problem. I had mine out and inspected them before heading down to CRAP in May and they looked just like they did when a bought them a couple years ago. I read the rants but did see that Jan did investigate the matter and thought it was related to the ethanol in the fuel being used. I read that he did replace the worn needles from Berger and COB. I corresponded with Jan several times while buying mine and found him to be a great and very knowledgeable guy. At my request he set up a Paypal account because my bank was wanting to charge me $50 to make the currency exchange. He could have just told me it wasn't his problem, but he didn't and set up the Paypal account. A couple of Uralisti that followed me down Skyline Drive/BRP to CRAP were impressed with my rigs (impressive by Ural standards :roll: ) pulling power on the hills. If you buy them, you won't be sorry.

Best Regards,
Doug
Last edited by doug on Wed Jul 04, 2012 11:19 pm, edited 2 times in total.
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Re: Jetting

Postby Coluralado » Tue Jul 03, 2012 11:16 am

What do your plugs look like?

I agree with IAURAL...42.5 slow jets and three turns out on the mixture screw doesn't equate.

What ignition system are you running? The shimming of the needles can be different depending on what ignition system you are using.
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Re: Jetting

Postby Lee Pape » Tue Jul 03, 2012 5:02 pm

Rickus wrote: I installed the 42.5 pilot jets (Mikuni Crabs) :(


He has Mikuni carbs for some reason. They are a different animal then the stock carbs.
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Re: Jetting

Postby Rickus » Tue Jul 03, 2012 8:21 pm

The exhaust dosen't have any baffles or cats living in them. Stock style paper air filter which is newish. Mikuni carbs were on the bike when I purchased it, but I do have the Keihin carbs in a box. I had the screws out three turns to keep the engine running at idle. Have a Type V ignition. Today I tinkered with her again (with a clearer head) and reset the idle air screws. The bike kept running when I had them all the way in. Still had some poping and farting taking off but was able to get to 65 mph. Was putting her in the garage when I turned the habdle bars and had serious smoke come out of the headlight bucket. Seems one of the prior owners (two of them) hacked the harness up pretty good and it finally shorted out! :x So I am in the process of rewiring her. Anyway, I do have a set of 130 pilot jets I can install once she is running again. Ain't Ural FUN? :D
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Re: Jetting

Postby vetsurginc » Wed Jul 04, 2012 4:26 pm

doug
Having trouble finding the posts with the contact information for the Gossie needles. Could you post the link or point me a little closer?

Thnaks!
Doug
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Re: Jetting

Postby TerryG » Wed Jul 04, 2012 4:27 pm

Stock pilot jet size for a Ural is #35. That shouldn't change too much as long as you've got a stock intake. Stock main jet size for a Ural is #110. With an open exhaust you will have to go richer - >110 - but where who knows. Jets for these are cheap and available, so grab a bunch and start trying. Also, get the jet removal tool that lets you take the main jet out without taking the float bowl off - saves a let of time and is cheap. The needle position shouldn't matter to much until you get the main jet worked out. Just leave it in the middle.
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Re: Jetting

Postby Rickus » Wed Jul 04, 2012 9:45 pm

I don't know what difference, if any, there is between the Mikuni and Keihin carbs other than manufacturer. Once I re-wire my Ural I'll be trying to tune her again with the smaller mains.
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Re: Jetting

Postby doug » Wed Jul 04, 2012 10:57 pm

vetsurginc wrote:doug
Having trouble finding the posts with the contact information for the Gossie needles. Could you post the link or point me a little closer?

Thnaks!


Hi Doug!

Here is the link to the Gossie /Ural Netherlands website. The email addresses to contact Jan to order or request info are there on the page. I emailed Jan at the "order or inquiries" email address and that set the process in motion. It has been a while, but to the best of my recollection, he sent me a Paypal link that I used to place the order.

http://www.ural.eu/en/cont.html

Best Regards,
Doug
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Re: Jetting

Postby doug » Wed Jul 04, 2012 11:06 pm

In the stable:
2007 Ural Patrol: 35,000+ km, Winner of the highly coveted "Cleanest Ural" award at CRAP 2011 & 2012
1988 BMW R100RT (owned since new)
2012 Honda Goldwing

Previous Steeds: 1987 BMW K75S, 1979 Kawasaki KE 250, 1982 Honda MB-5
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Re: Jetting

Postby windmill » Thu Jul 05, 2012 12:27 am

doug wrote:
they are without question the best performance mod I have done on my rig. They are tapered and sized to work with the original factory jets so you don't have to mess around changing and tuning jets. Drop them in and be done with it; your rig will run noticeably stronger/better at all throttle ranges, no more farting or popping.

THESE WORK and work very well. For me, the $75 was one of the best investments made.

I read that he did replace the worn needles from Berger and COB.


I'll second that,
Best thing you can do to a Ural. They work great and are worth the money, much better than shims or generic needles. He also replaced mine, he stands behind his product, and thats all that counts.
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Re: Jetting

Postby berger » Thu Jul 05, 2012 7:40 am

doug wrote:I read that he did replace the worn needles from Berger and COB.


Yup, he replaced mine too. I am concerned they will wear out again though.
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Re: Jetting

Postby Lokiboy » Thu Jul 05, 2012 1:37 pm

I wonder why none of the dealers in the US have an agreement to carry the needles if they are that good?
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