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Carb jet kit question (SOLVED)

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Carb jet kit question (SOLVED)

PostAuthor: ghostdad » Wed Mar 31, 2010 9:20 am

Where is a good place to but a carb jet kit? My bike is running extremely rich, the P.O said he drilled out the jets. I have no idea how much he drilled them, so the only thing I can imagine is that could be the problem now is he overdrilled them. So i think my best bet is to put stock jets back into it and hopefully fix my problem.

One other thing that is baffeling me is, I have the pilot screw / mixture screw turned all the way in on the back cylinder and it still runs rich? Shouldn't that pilot screw cut off the fuel and starve the cylinder? Is it possible the P.O put the pilot screws into the wrong carb? I'm pretty sure I have read on here they are carb specific. Am I correct? I kept the parts for each carb seperate and marked.

The bike runs strong but the plugs are black and sooty. They are not wet just sooty, I have checked and eliminated the petcock from being the problem. I did this by checking and marking the fuel level before giving up for the night and checking it in the morning and the fuel level did not change. Then I popped the carbs off so I could check the rear cylinder carb holder and it was dry, so the petcock is not leaking into the cylinder.
I also removed the intake boots thinking that maybe something was plugged and blocking air flow which would cause a rich condition. There was no change in how it ran.

So am I missing something here? I have checked and eliminated everything except the pilot screw being in the wrong carb. ( becuase i just thought of it as I was typing this thread.) LOL I'll get back to you on the results. Any other suggestions?
Last edited by ghostdad on Fri May 07, 2010 6:51 am, edited 1 time in total.
1983 Virago XV920K - second generation starter system, MCV removed, second ground added.
1982 Virago XV920J - Seized motor parting out.
1997 BMW R1100RT - gone but not forgotten
1992 BMW K75RT - gone
1980 Honda 1100 Interstate - gone
1982 Yamaha Maxim 750 - gone

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PostAuthor: funkamongus » Wed Mar 31, 2010 10:19 am

Are the right jets and needles in the right carb? They ARE side specific on the 920.. Did you remove MCV? Did you gain access to your mixture screws? I bought two kits, Ill go look up where I bought em and as much info as I can get, it was a good kit.
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1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

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PostAuthor: funkamongus » Wed Mar 31, 2010 10:23 am

www.siriusconinc.com part number 18-2578 is the 1982 xv920J kit. With ALL the goodies. cost me about 30 to the door. I got two. So, 60ish for the both. They worked great, and the did good business with me. I can recommend them.

Its saying on the website that no part number was found with that number.. so, email them at sci@siriusconinc.com . They were very good about communication, so it wont take long to get you hooked up.
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Scott Parsons
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1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

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PostAuthor: Xumi » Wed Mar 31, 2010 4:18 pm

I'd guess it's the drilled jets too, especially if both plugs are sooty.
1981 XV750 - Rescued garage queen, restoration in progress
1979 XS650 (Lady of the Lake) - Barn find, restored, sold
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Re: Carb jet kit question

PostAuthor: ghostdad » Wed Mar 31, 2010 5:18 pm

I am not sure if the right needle and jets are in the right carb. I put things back where they came out, the P.o might have mixed them up. I switched the pilot screws to the opposite carb and now it is running real rough but still running rich even with them turned all the way in to soft seat. The MCV is removed and the vacuum lines at the carb boots are capped. How can I tell if they are in the right carb?
Thanks Funk I am waiting a reply from SCI on the carb kits.
1983 Virago XV920K - second generation starter system, MCV removed, second ground added.
1982 Virago XV920J - Seized motor parting out.
1997 BMW R1100RT - gone but not forgotten
1992 BMW K75RT - gone
1980 Honda 1100 Interstate - gone
1982 Yamaha Maxim 750 - gone

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PostAuthor: Xumi » Wed Mar 31, 2010 5:25 pm

Read the numbers on the jets. The smaller jet should be to the front - not sure about the needles (although I do know they are different).

The mix screws are not side specific, just jets and needles.

Not all the fuel for the idle circuit comes through the air/fuel mix screws. It's definitely possible to be rich even with them seated.

Another possibility would be the choke circuit, as it bypasses the air/fuel mix screws.
1981 XV750 - Rescued garage queen, restoration in progress
1979 XS650 (Lady of the Lake) - Barn find, restored, sold
1995 VN1500 - Daily driver

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PostAuthor: funkamongus » Wed Mar 31, 2010 5:27 pm

the man jet and the needle, and the pilots for that matter, all have numbers pressed in to the tops of them or on the side, in the case of the needle.. I dont know how good your eyes are,, I need some really good glasses to make out what numbers were on them until I got where I could see them plainly... theyr'e on there!! PS did you find the air passages in the frame and the elbows in the rear of the carb?? Blow out the frame,, I understand you can, if there is a problem with the filters in the elbows, cut them open, replace filter material, and rtv back together?? If you need to do that, let me know, I'll find the article, Im sure Im not explaining it right..
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Scott Parsons
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1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

Pictures -http://picasaweb.google.com/funkamongus20?feat=email-
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what mixture screw?

PostAuthor: ghostdad » Wed Mar 31, 2010 7:19 pm

funkamongus";p="199394 wrote:Are the right jets and needles in the right carb? They ARE side specific on the 920.. Did you remove MCV? Did you gain access to your mixture screws? I bought two kits, Ill go look up where I bought em and as much info as I can get, it was a good kit.


Where is this mixture screw? The only adjustable screw I have is the pilot jet on the bottom of the carb. I have heard reference to this but haven't been able to figure out where it is. A picture and or a good description would be helpfull. I have looked all over the carbs for cap that is blocking it but cannot locate it.

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PostAuthor: funkamongus » Wed Mar 31, 2010 7:32 pm

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Scott Parsons
South Lake Tahoe

1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

Pictures -http://picasaweb.google.com/funkamongus20?feat=email-
Videos -http://www.youtube.com/funkamongus20-

for pics and vids from above..
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If at first you dont succeed,, maybe skydiving isnt for you..
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Re: Carb jet kit question

PostAuthor: ghostdad » Wed Mar 31, 2010 8:17 pm

Thanks Funk, now i know we are talking about the same thing. Correct me if I am wrong here, I just checked the jets in the top of the carb under the float tube? I just watched a you-tube video on cleaning carbs on a 750. I believe the 750 and 920 are basicly the same right. Well in the video he said the smaller jet goes to the side and the large jet is in the middle. Is this correct? My carbs are wrong if this is correct. I will change them tomorrow and test to see if that helps.
1983 Virago XV920K - second generation starter system, MCV removed, second ground added.
1982 Virago XV920J - Seized motor parting out.
1997 BMW R1100RT - gone but not forgotten
1992 BMW K75RT - gone
1980 Honda 1100 Interstate - gone
1982 Yamaha Maxim 750 - gone

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Re: Carb jet kit question

PostAuthor: ghostdad » Thu Apr 01, 2010 4:08 pm

Is the rear cylinder the #1 cylinder?
1983 Virago XV920K - second generation starter system, MCV removed, second ground added.
1982 Virago XV920J - Seized motor parting out.
1997 BMW R1100RT - gone but not forgotten
1992 BMW K75RT - gone
1980 Honda 1100 Interstate - gone
1982 Yamaha Maxim 750 - gone

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PostAuthor: funkamongus » Thu Apr 01, 2010 4:16 pm

yes on #1 cylinder,, and yes, main jet is in center and pilot (smaller one 41, is off to the side. Theres your problem!!
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Scott Parsons
South Lake Tahoe

1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

Pictures -http://picasaweb.google.com/funkamongus20?feat=email-
Videos -http://www.youtube.com/funkamongus20-

for pics and vids from above..
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If at first you dont succeed,, maybe skydiving isnt for you..
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Re: Carb jet kit question

PostAuthor: ghostdad » Thu Apr 01, 2010 4:27 pm

Thanks Funk for the qick reply... Here is my current issue, I checked the needles and it appears that the P>O put them in the wrong carb. So I switched them and now it seems to only be running on the rear cyclinder, which is still running rich. Are the jets themselves side specific? If so then when I order new jets are they numbered accordingly?
1983 Virago XV920K - second generation starter system, MCV removed, second ground added.
1982 Virago XV920J - Seized motor parting out.
1997 BMW R1100RT - gone but not forgotten
1992 BMW K75RT - gone
1980 Honda 1100 Interstate - gone
1982 Yamaha Maxim 750 - gone

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PostAuthor: funkamongus » Thu Apr 01, 2010 4:35 pm

yes and yes..the pilots will be 41s... in both.. the rear or #1 cyl, gets the Y25 needle and 126 main jet,, your #2 or front cyl gets, Y24 needle and 128 main. Your pilots will be about 2 and 1/2 out from soft seat to get you started... Once all is good and it will run, plan your next day out. Set Valve lash first, while engine is cold. Warm up engine really well and put it on stand with fan on motor.. Adjust mixture and sync carbs as per knowledge base article,
http://viragotechforum.com/viewtopic.ph ... light=sync
and You should be golden!!
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Scott Parsons
South Lake Tahoe

1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

Pictures -http://picasaweb.google.com/funkamongus20?feat=email-
Videos -http://www.youtube.com/funkamongus20-

for pics and vids from above..
copy between the "-" signs, and paste it in your browser..

If at first you dont succeed,, maybe skydiving isnt for you..
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PostAuthor: funkamongus » Thu Apr 01, 2010 4:37 pm

A lot of folks still say to drill out the pilot jets, I would try what you got when you know its right, and see...
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Scott Parsons
South Lake Tahoe

1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

Pictures -http://picasaweb.google.com/funkamongus20?feat=email-
Videos -http://www.youtube.com/funkamongus20-

for pics and vids from above..
copy between the "-" signs, and paste it in your browser..

If at first you dont succeed,, maybe skydiving isnt for you..
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Re: Carb jet kit question

PostAuthor: ghostdad » Thu Apr 01, 2010 7:43 pm

The P.O said he drilled out the jets and I think that is the cause of my rich condition. I have new jet kits ordered ( thanks Funk for the link ), once I get those I am almost positive I can eliminate that problem.

Thanks for everyones help I will let you know the results once I receive the new jets and get them installed.

Dave


p.s. I must say I think I can keep up with the best of em, removing and installing the carbs now...LOL
1983 Virago XV920K - second generation starter system, MCV removed, second ground added.
1982 Virago XV920J - Seized motor parting out.
1997 BMW R1100RT - gone but not forgotten
1992 BMW K75RT - gone
1980 Honda 1100 Interstate - gone
1982 Yamaha Maxim 750 - gone

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Re: Carb jet kit question / update..

PostAuthor: ghostdad » Sun Apr 25, 2010 9:29 am

Alright I finally had time to install the new jet kit, and the results are good!! Now I have a vacuum leak on the front cylinder, the intake boot is leaking. Looks like the P.O in his ultimate wisdom shoved a small screw driver or something similer through the side of it where the carbs mounts. So is there any way of repairing this at least temporarily so I can finish getting the carbs dialed in?
Anyone know of a good source for the intake boots? Thanks Funk for the link for the jet kits, S.C.I. is a good place to do business.
1983 Virago XV920K - second generation starter system, MCV removed, second ground added.
1982 Virago XV920J - Seized motor parting out.
1997 BMW R1100RT - gone but not forgotten
1992 BMW K75RT - gone
1980 Honda 1100 Interstate - gone
1982 Yamaha Maxim 750 - gone

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PostAuthor: funkamongus » Sun Apr 25, 2010 9:53 am

Lots of folks "paint" the boots with 3m liquid electrical tape. If its really bad,, you can glue a section of tire tube over the whole thing. Or, If it were me. Id just try to find some new. Let me see if they're available new.. yes,, bout 70 bucks per.. find your part number,, yes they are side specific, put that part number into google.. Here, I found the boot,, its number 1 on the air cleaner parts page. Its the boot for the REAR cylinders carb.

part number is 10L-13586-01-00 . when put into google, it brings up a page where I compared and found this.

http://www.georgiawatersports.com/Produ ... egory=3427

if you need the right one, do the same with this number.
10L-13596-01-00 (right carb boot)
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Scott Parsons
South Lake Tahoe

1982 Yamaha XV920J
1982 Maico Alpha 1 MC250
1982 Yamaha XZ550RJ Vision
1972 BMW R75/5 W/Toaster tank, I babysit

Pictures -http://picasaweb.google.com/funkamongus20?feat=email-
Videos -http://www.youtube.com/funkamongus20-

for pics and vids from above..
copy between the "-" signs, and paste it in your browser..

If at first you dont succeed,, maybe skydiving isnt for you..
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PostAuthor: Xumi » Mon Apr 26, 2010 1:56 am

Youch, that's a price!

Try this - $55 for a Pair, and shipping is reasonable too... less than half the price, and it's always much better to replace them as a pair, as you don't want to have the other one getting rubber rot in a few years from age.


http://www.carbkitscapital.com/carb_kit ... odel=XV920

That's about the lowest I've seen so far, including fleabay. About the best price anywhere for float needles/seats too (and I'm using a set of their float needles/seats, and they are to date, perfect).
1981 XV750 - Rescued garage queen, restoration in progress
1979 XS650 (Lady of the Lake) - Barn find, restored, sold
1995 VN1500 - Daily driver

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PostAuthor: coalstoves » Mon Apr 26, 2010 2:04 am

I dont order from places like that, a cheesy generic websight no address no phone and a hotmail email addy . They just might be fine but those are some red flags a savy internet shopper should look for.

Look up georgefix on ebay lots an lots of folks here buy from him and I've never noticed a complaint .
Last edited by coalstoves on Tue Apr 27, 2010 1:14 pm, edited 1 time in total.
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