XS850 - Monoshock & USD Fork (pics pg 13)
- Thread starter treitz
- Start date
Tune-A-Fish
BOTM LOSER Proudly Deplorable
treitz said:
Well it's and 850 So if you could find a way to hang 3 of these bad boys:
http://www.ebay.com/itm/Keihin-PWK-38mm-38-mil-Flat-Chrome-Slide-Carb-Carburetor-TRX250R-CR250-LT250-/201272059960?hash=item2edcbfe838&vxp=mtr
And get this: cable setup to pull em up a go go!!
http://www.ebay.com/itm/THROTTLE-CABLE-COMPLETE-KAWASAKI-H2-750-54012-100-/171639573498?hash=item27f6840bfa&vxp=mtr
Has to be a jetting scheme to make em work
Tune-A-Fish
BOTM LOSER Proudly Deplorable
datadavid said:
The flat bills here don't know what a jet is... Purely and online order deal in my neck of the fruit loops.
treitz
Over 1,000 Posts
datadavid said:
That's awesome! My favorite jet find to date was a motocross place in Boise about a mile from my old house that had a HUGE assortment of jets for Mikuni VM slide carbs. They would give me a handful of jets, let me trade jets, try them all, and then only pay for the ones I kept. Of course those jets only cost like $2 each, but it was still nice to not have to buy a million of them.
Tune-A-Fish
BOTM LOSER Proudly Deplorable
I was at a Skuzi dealer with a shitload of what looks like old NOS parts filling 14 foot shelves and I asked for pilot jets... what did the guy say... "What year and model is it, we don't sell much of those"... the whole time he is asking I'm looking straight at a stack of yellow boxes on a shelf above his head.
Long story short I got half of what I needed but the boxes were never restocked or shit tossed in the wrong hole... I keep looking for them old boxes to show up so I can buy them and now I will rob jets off carbs before scrapping anything.
Long story short I got half of what I needed but the boxes were never restocked or shit tossed in the wrong hole... I keep looking for them old boxes to show up so I can buy them and now I will rob jets off carbs before scrapping anything.
treitz
Over 1,000 Posts
Welp... back to square 1. Put the carbs back on after "fixing" the crack, double checking float height, and bench syncing and it ran worse than ever. Was only running on the #1 cylinder the majority of the time. At a loss. Is it worth attempting to jet and salvage these carbs... or try to find replacements? :-\
On a side note... it's not possible that I have the plugs/coils hooked up in the wrong order is it? I'm under the impression that it wouldn't even run if they were wrong... but I could be wrong.
I obviously labeled them when I took at apart and put it back together, but we all make mistakes
On a side note... it's not possible that I have the plugs/coils hooked up in the wrong order is it? I'm under the impression that it wouldn't even run if they were wrong... but I could be wrong.
I obviously labeled them when I took at apart and put it back together, but we all make mistakes
MotorbikeBruno
Over 1,000 Posts
You are correct, it would not run. It would backfire and pop and sound terrible all while making you think you broke something internal. HA!
Interesting on running worse! What do we have those mixture screws at right now again?
With all of the problems and looking at the interior of the carbs, it's very possible that it's just worth finding another set. I'll check my local CL for you. Usually an 850 being trashed around here
Edit: You do have new carb boots to engine or at the very least you know they aren't leaking? (if not: http://www.ebay.com/itm/3x-K-L-YAMAHA-XS750-XS850-CARB-HOLDERS-INTAKE-MANIFOLD-BOOTS-11-6114-/191627001095?hash=item2c9ddbfd07&vxp=mtr)
And a set of carbs with Or Best Offer on them. Your Internals could be used if necessary on these. The bodies might be in much better shape. Ask if they'll get you pictures of the insides maybe?
http://www.ebay.com/itm/CARBURETORS-1980-YAMAHA-XS-850-/111723486481?hash=item1a033d1d11&vxp=mtr
Interesting on running worse! What do we have those mixture screws at right now again?
With all of the problems and looking at the interior of the carbs, it's very possible that it's just worth finding another set. I'll check my local CL for you. Usually an 850 being trashed around here
Edit: You do have new carb boots to engine or at the very least you know they aren't leaking? (if not: http://www.ebay.com/itm/3x-K-L-YAMAHA-XS750-XS850-CARB-HOLDERS-INTAKE-MANIFOLD-BOOTS-11-6114-/191627001095?hash=item2c9ddbfd07&vxp=mtr)
And a set of carbs with Or Best Offer on them. Your Internals could be used if necessary on these. The bodies might be in much better shape. Ask if they'll get you pictures of the insides maybe?
http://www.ebay.com/itm/CARBURETORS-1980-YAMAHA-XS-850-/111723486481?hash=item1a033d1d11&vxp=mtr
treitz
Over 1,000 Posts
MotorbikeBruno said:You are correct, it would not run. It would backfire and pop and sound terrible all while making you think you broke something internal. HA!
Interesting on running worse! What do we have those mixture screws at right now again?
With all of the problems and looking at the interior of the carbs, it's very possible that it's just worth finding another set. I'll check my local CL for you. Usually an 850 being trashed around here
Yeah, that was my fear. Air mixture screws are at 2.5 turns out. Stock is 2.25. Other than adjusting the float height, nothing that I did when I had them off should have affected how it ran. However I did feel like the float height was too high, so I adjusted it down on all three to the specs in the book. I guess I could be starving it of gas now, but at the same time, that doesn't explain why they aren't all consistent. Left is still black as night.
MotorbikeBruno
Over 1,000 Posts
See my edit above on that last post.
If left is black as night, you've got a couple of possible issues still. Did you take out the mixture screw and verify that it's spring, washer and then O-ring in that order? Is the tip broken? (on the one cylinder)
As for the mixture screws. With all of the stuff you have done. .25 more WILL NOT CUT IT. You will be at 3-4 turns out more likely to make those cylinders happy. So long as you are using stock pilot jets that is.
Let's say that your carbs AREN'T the problem for fun. Then we've got some sort of ignition issue on #1 maybe? You have spark, we know that, but maybe it's weak. Try cutting 1/4" off the plug wire and screwing it back on? Anybody else with ideas if it ISN'T the damn carb? Just in case.
If left is black as night, you've got a couple of possible issues still. Did you take out the mixture screw and verify that it's spring, washer and then O-ring in that order? Is the tip broken? (on the one cylinder)
As for the mixture screws. With all of the stuff you have done. .25 more WILL NOT CUT IT. You will be at 3-4 turns out more likely to make those cylinders happy. So long as you are using stock pilot jets that is.
Let's say that your carbs AREN'T the problem for fun. Then we've got some sort of ignition issue on #1 maybe? You have spark, we know that, but maybe it's weak. Try cutting 1/4" off the plug wire and screwing it back on? Anybody else with ideas if it ISN'T the damn carb? Just in case.
Well it wouldn't hurt to check the ignition wiring. It is entirely possible to get it right on one cylinder and have the other two swapped. Of course it would only run on the one cylinder, but very likely you would have serious backfiring etc. - triples do this a bit differently than 180 degree cranks we are all probably a bit more used to. A V8 with the right 2 plug wires swapped won't back fire at all, just run poorly, but not nearly as bad as you would expect wit 1/4 of it inactive. I would be looking for something a bit more obvious than the fine points of the carbs for a problem first. Usually if the float heights are off a bit, the problems are pretty slight - even negligible. This is different than a hole in one of the floats. Same with the pilot circuit. It is NOT a 1/4 turn issue. That is different than a blocked air jet or broken off needle. The point is that it seems like your troubles are bigger than a not more obvious issue unless I am just reading all this wrong.
Back on the ignition, I would go through it and KNOW it is not the issue. Make sure the timing is correct on all three cylinders, and the advance is working properly. Check for good consistent spark on ALL cylinders. Make sure all three pipes are getting similarly hot. Swap the coils and see of the bad cylinder moves. You can do all this pretty quickly and easily and even if you are pretty confident the issue is with the carbs, it is a small price to pay for confidence.
Back on the ignition, I would go through it and KNOW it is not the issue. Make sure the timing is correct on all three cylinders, and the advance is working properly. Check for good consistent spark on ALL cylinders. Make sure all three pipes are getting similarly hot. Swap the coils and see of the bad cylinder moves. You can do all this pretty quickly and easily and even if you are pretty confident the issue is with the carbs, it is a small price to pay for confidence.
treitz
Over 1,000 Posts
jpmobius said:
I totally agree. This is exactly where my thinking is now. I've dealt with enough carbs to know that a rich/lean mixture typically causes the bike to run like shit, but not like this bike is running. It is VERY possible that the PO had the coils wires crossed meaning when I labeled them, it didn't do any good. I'm kicking myself for not checking this when I put the thing back together. Live and learn I guess.
I'm anxious to get to it tonight to see if I can track down what might be an obvious issue!
I'll keep you guys posted...
datadavid
Over 1,000 Posts
I can tell you by experience that these will not start at all with 2 coils in the wrong order (spent 30 minutes kicking my build with nothing but backfire, kickbacks and the occasional flame out the exhaust..) if it was running at all before, then coils were in the right order. But going through the ign.system completely is a good idea, mine had broken and shorted wires all around, especially where they come out of the timing cover.
MotorbikeBruno
Over 1,000 Posts
Yep. Just figured since we've been tackling carb issue after carb issue and nothing changes on#1, it's best to verify everything else is in order because trying to find a carb issue when it's actually an electrical one....well...won't get your bike up and running. Get on with the electrics to verify and I agree with David on the coil issue. This thing will not run with coils swapped. The timing doesn't allow it. It will backfire and shoot flames from the carb throat or the exhaust.
Get on with the electrics to verify and I agree with David on the coil issue. This thing will not run with coils swapped. The timing doesn't allow it. It will backfire and shoot flames from the carb throat or the exhaust.
