a little bit of carb help

[schooter]

hey guys, i have 2 questions

1. I need 4 new o rings for the carb seat - where can i get them?

2. is the fuel pump on here really necessary? or can i just put the bike on pri and run the two petcocks to the two inlets? I would think so...

3.are the intake bolts as notorious for snapping off as the xj's? the boots on this bike are REALLY bad, and we have a set of decent replacements... but it they are like the xj's, soft bolts lock tightened into the motor, i may just get some black rtv and have fun

im pretty fluent with the xj 650-760's im on the xjbikes.com site under the same name, but these xs11's are a different beast.

Thanks guys

[natemoen]

1) I think several people have just bought the correct sized o-ring in viton. I don't know the size cause I have the older style carbs which do not have the o-ring and I am assuming you have the later style carbs. Could also contact Georgefix on ebay and I am sure he could sell you the correct part.

2) These bikes do not have a fuel pump. Again I am assuming that you are talking about the octy. The octy is actually a vacuum fuel shut off valve this a small square thing with a ton of hoses on it sitting on top of the 1-2 carbs.

No its not needed, lots of guys ditch it and then block off the front prime port on the petcocks and then run a hose from the rear petcocks ports to the carbs.

3) As far as I know the xs and XJ 11s use the same intake boots. Although they are NOT the same as the 650-750-850 boots. Some guys RTV them but you cam get a set of 4 on ebay for 45 necks and they should last the life of the bike as long as you take care of the bike and keep things clean.

As another suggestion. Put your bike year and model in your signature line so we know what you have. Some things are.year and model specific.

[DGXSER]

1. I need 4 new o rings for the carb seat - where can i get them?

Go to Harbor Freight, they sell o-ring kits in Nitril and in Viton. I use the Nitril, its less than half the cost of the viton and will hold up fine. And for the cost fo ordering them form anywhere, you have an entire kit of o-rings.

2. is the fuel pump on here really necessary? or can i just put the bike on pri and run the two petcocks to the two inlets? I would think so...

As Nate mentioned, there is no fuel pump. What your looking at is the vacuum operated fuel valve commonly referred to as the Octy. It uses engine vacuum to hold the valve open and allow fuel to flow to the carbs, but only when the engine is running.

It is very common, I have done it to every XS11 I have owned or been asked to work on the fuel system of, to remove that valve. Just cap off the prime outlets, and run the ON/Reserve outlet of the petocks direct to the carbs. Most people add an inline fuel filter though.

3.are the intake bolts as notorious for snapping off as the xj's? the boots on this bike are REALLY bad, and we have a set of decent replacements... but it they are like the xj's, soft bolts lock tightened into the motor, i may just get some black rtv and have fun

Sorry, you said 2 questions, this would be three..........well...ok. What is very common on these bikes is that the exterior of the intake boots get very cracked. But typically not where they go through to the inside. Most folks use some type of RTV product like Plasti-dip to seal them back over and make them look new.

Hope that helps you out.

[Rasputin]

I went to the local Yamarobber and they told me these o-rings are discontinued. However there is a solution. Suzuki does offer the correct o-rings and washers and they are available individually as well. The O-ring part number is 13295-29900 and the washer part number is 13291-29900. This way one does not have to order the whole mixture screw to get the washer or o-ring.

I would get a rebuild kit for the Octy and fix it up. This is available from Georgefix on ebay. I like the extra protection I feel I get from having the octy functioning.

New carb boots are also available from Georgefix and I believe Parts'n'more for around 95 bucks. I have not yet seen them for 45 bucks which some say are on ebay, however they may well be. They fit the XJ's perfectly.

I used plasti-dip to fix up my cracked boots and was happy with that for a few yrs, then new boots became a necessity. At the time I did the plasti-dip fix boots were not readily available from anyone but Yamaha so they were quite a bit more expensive than the ones you can currently get. I have posted somewhere on here some pics of the carb boots cut in half. They may help you decide what to do with your carb boots.

[natemoen]

There were several sets for 45 on there last week when I was looking but now I got to find then and alas I can't find any. 70 seems to be the cheapest now.

[schooter]

ok guys, thanks a bunch, that sonovagun is going to be gone, i like the xj's with their vacuum petcocks.

ok and one other question... my xj750 stock have 2 jets, a 120 and a 40... but these carbs have that teeny weenie little jet in front, and then 110's as their main jet... wth is up with that? is this a case of bad PO's or what?

I have, I think, it's an 80 midnight version.

this bike does have all sorts of PO hack jobs on it, so wrong jets wouldnt surprise me

[schooter]

I went to the local Yamarobber and they told me these o-rings are discontinued. However there is a solution. Suzuki does offer the correct o-rings and washers and they are available individually as well. The O-ring part number is 13295-29900 and the washer part number is 13291-29900. This way one does not have to order the whole mixture screw to get the washer or o-ring.

What washer? I never had a washer anywhere but with the main jet...

[cywelchjr]

What washer? I never had a washer anywhere but with the main jet...

I think he is talking about the o-ring and washer on the idle mixture adjustment screw. Those can also be had from MikesXS, just don't tell him your getting them for something other than an XS650. I think they come in sets of two, so you may need two kits (unless I misremember and they are singletons in which case you need 4).

[Rasputin]

What washer? I never had a washer anywhere but with the main jet...

The mixture screws have a screw, the spring, washer, and o-ring, in that order on those carbs. Otherwise the spring would push directly on the O-ring and could ruin it.

[DGXSER]

Hey Ras, the O-ring he is speaking about is the one that seals the float needle valve seat. Not the mixture screw.

Schooter - As to jetting, I am not 100% certain on the XJ models of the sizes. On the 81 XS1100 models the main jet in the center over that washer is a 110, some folks use a 120, and the factory did split them on a few to be 110s on the outer carbs and 120 on the inner carbs but very very few ever rejet like that. It was a "trial" thing to keep the inner cylinders cooler since they do not get the same airflow as the outer ones.

The pilot jets down in the little tunnel right in front of the main jets in the float bowls are 42.5 on the XS1100 models. But they may have been down sized to 40 on the XJ.

The other screw/"jet" being discussed is the mixture screw down in the tunnel on the top side of the outlet of the carb, right in front of the enricher. on the later model carbs, that screw has a spring with a washer on the end of it that pushes on a very small o-ring to seal it.

[bikerphil]

The 82 XJ11 should have a 47.5 pilot jet from the factory. Schooter, it would help if you put the model of your bike in your signature, this is getting a bit confusing. What happened to your original avitar you used to have?

[Rasputin]

Boy was I ever barking up the wrong tree.

[natemoen]

You seem unsure of what bike you have. Post your vin from both the motor and the steering neck of they are different so that we know what bike you have so we can better help you.

[motoman]

Not at all Rasputin...........good info..........needed those numbers so's I can put the four missing washers on mine. Put in the new teeny-tiny o-rings and washers were among the missing so need to put some of those in before the o-rings get hung up on them.