What rpm are you running at idle?
-
Enjoy XS650.com? Consider making a donation to help support the site.
XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going.
When bike leans to the side with choke off it stalls
- Thread starter Noidea
- Start date
Noidea
XS650 Addict
unfortunatly I don't know the answer to that question. My tachometer does'nt work. ://. I just try to let it idle low enough so the engine sounds ok.
the Tachometer is driven off the oil pump. If the Taco isn't working the first thing to do is check to see if the cable is broken................if not the oil pump may not be working..................
Indeed! It has been pointed out in another thread recently that a dead tach may signal a dead oil pump....which will soon lead to a dead engine.
Noidea
XS650 Addict
The internals of the tach jus don't work the cable spins when the engine is turning and if i take a valve cover off and run it oil spurts everywhere. The pumps works. Im back at it today. gonna change float height to 25.5. Is there anything else i should take a look at while im already in the carbs besides the diaphragm to make sure they haven't spun over?
Are you wanting/trying to get it to lope/potato at idle? My experience is these like to idle 11-1200 rpm. Less than 1000, and they become troublesome.
Noidea
XS650 Addict
No I let it idle so it sounds like a consistent rumble. maybe ill post a video so you guys can see the situation i got. diagnoses is hard enough with just words.
I think it is important to run a Tach on these bikes because it is basically an oil pump fail safe feature. As long as the oil is splashing out of the Tappet cover you should be alright.
I remember a member tried to tell us their pump was working and oil was misting out of the Tappet-cover, it was obvious by the description, the bike's oil pump had a problem, but he wouldn't listen. Eventually he looked at the pump and ............yes it was broken, the pin had come out of the shaft holding the pump wheel on.
Noidea
XS650 Addict
@650Skull Whats another way I can check to make sure its running efficiently?
Today I adjusted the floats to 25.5 and put gasket sealer on the diaphragms. I also took off the left side muffler so both sides are muffler less. had to remove the centerstand too because without the muffler it touches the drive chain. No dice doesnt even want to idle now
I only tried it a couple of kicks worth got other business to attend to prob get back 2mm. but yyyy now nothing when it idled fine. Gonna try to get my mechanic friend to check it out he deals with carbs too im at a loss once again. Below is how i took the measurements of the floats maybe Im doing something wrong?? I don't know just figured I put it out there. Ill be adding more to the thread 2mm and so on got nothing else for today
Today I adjusted the floats to 25.5 and put gasket sealer on the diaphragms. I also took off the left side muffler so both sides are muffler less. had to remove the centerstand too because without the muffler it touches the drive chain. No dice doesnt even want to idle now
I only tried it a couple of kicks worth got other business to attend to prob get back 2mm. but yyyy now nothing when it idled fine. Gonna try to get my mechanic friend to check it out he deals with carbs too im at a loss once again. Below is how i took the measurements of the floats maybe Im doing something wrong?? I don't know just figured I put it out there. Ill be adding more to the thread 2mm and so on got nothing else for todayAttachments
Have you read the carb guide? If not you might want too.
Here's a link in case. www.amckayltd.com/carbguide.pdf
Leo
Here's a link in case. www.amckayltd.com/carbguide.pdf
Leo
Noidea
XS650 Addict
Yep I've read through it many a times.
First i want to apologize for the lengthy question/explanation coming up. I just want to get to the bottom of this I've been working on this for so long and I just want it to be right. I was super close to just giving up but I wont let it beat me. Im open for all suggestions and criticism. I need a break from this thing for a couple days caught myself getting fairly frustrated.
When I came to the bike this morning i noticed there was a slight leak and it looked like it was either from the petcock it self or the overflow. I took the carbs out blow air through the holes for extra assurance and checked the float height again put everything back and added fuel lines for the overflow. When I put it back on and switched to the on position fuel came coming out of the over flow at a decent amount. Than it just stopped. I was looking it up and saw that this would usually indicate a float condition. either the needle isnt seated properly or its letting too much fuel in. My question is would the petcocks releasing more fuel than needed cause such a problem? I would say no because its controlled based off the fuel thats already in the carb correct? The floats are set too 25.5 so that shouldn't be a problem I double checked when i had them out. I know the carb guide calls for 24mm, which one is correct 24 or 25? I also checked my spring in the float valve prior and they are both working properly and both of the fitting they go into are 2.0 and clear. So what would cause the problem of fuel coming from the overflow?
First i want to apologize for the lengthy question/explanation coming up. I just want to get to the bottom of this I've been working on this for so long and I just want it to be right. I was super close to just giving up but I wont let it beat me. Im open for all suggestions and criticism. I need a break from this thing for a couple days caught myself getting fairly frustrated.
When I came to the bike this morning i noticed there was a slight leak and it looked like it was either from the petcock it self or the overflow. I took the carbs out blow air through the holes for extra assurance and checked the float height again put everything back and added fuel lines for the overflow. When I put it back on and switched to the on position fuel came coming out of the over flow at a decent amount. Than it just stopped. I was looking it up and saw that this would usually indicate a float condition. either the needle isnt seated properly or its letting too much fuel in. My question is would the petcocks releasing more fuel than needed cause such a problem? I would say no because its controlled based off the fuel thats already in the carb correct? The floats are set too 25.5 so that shouldn't be a problem I double checked when i had them out. I know the carb guide calls for 24mm, which one is correct 24 or 25? I also checked my spring in the float valve prior and they are both working properly and both of the fitting they go into are 2.0 and clear. So what would cause the problem of fuel coming from the overflow?
If the fuel stopped after a short time or a tap on the bowl then it is probably due to and empty bowl and the floats hanging down and maybe the float and Float valve got stuck in that position for a second or 2.............
As for height a mill either side wont make a difference, (may not), due to slight irregularities due to individuality of each bike and no 2 are exactly the same when working with carbs and timing and such.
As for height a mill either side wont make a difference, (may not), due to slight irregularities due to individuality of each bike and no 2 are exactly the same when working with carbs and timing and such.
This is why good pics can be handy.
Zoomed-in on your float pics and made a composite showing your left and right floats. Comparing, I think I see something in the bottom floats in this pic.
What I think I'm seeing is floats that are tilted/twisted, with float cells that are slightly narrower than the upper floats.
Take measurements of your floats, have a grind thru this thread, and compare your dimensions.
http://www.xs650.com/threads/cruzinimage-bs38-carburetor-floats-review.51657/
This is an active area of research, so don't have any hard/fast answers. Just something to raise awareness...
Zoomed-in on your float pics and made a composite showing your left and right floats. Comparing, I think I see something in the bottom floats in this pic.
What I think I'm seeing is floats that are tilted/twisted, with float cells that are slightly narrower than the upper floats.
Take measurements of your floats, have a grind thru this thread, and compare your dimensions.
http://www.xs650.com/threads/cruzinimage-bs38-carburetor-floats-review.51657/
This is an active area of research, so don't have any hard/fast answers. Just something to raise awareness...
Noidea
XS650 Addict
wow you killed it with that write up! That was amazing. My specs are defiantly related to yours with the slight difference between OEM and after market. What is there to do about that though for common folk such as myself? I have the original floats for the carbs that worked better but one of them had a hole in it thats why I bought the new ones but now the new ones suck. I guess ill have to use that sight tube measurment thatll probably help me a bunch with this situation thats probably my only solution at this point. Is there a link or thread on how to make the fitting for the fuel line I've seen get an 8m allen set screws and drill holes through them. Also the threads are starting to come out for the float bowls what can i do before its too late and i cant screw them on?
Noidea
XS650 Addict
I found it what to use for the fuel level check an M8-1.0 grease fitting so nvm about that. ill go buy couple of those now
Thanx, Noidea. I've updated that thread, with more to follow.
You may be our spearhead on the issues with those floats. What I'm thinking is that you may be fighting 2 things.
1- Float(s) dragging/catching on the bowl sides. Happening during a sidestand lean is a good indicator of this.
2- Different buoyancy. The float(s) may be setting lower in the fuel, creating an overfilled condition. My gut tells me that you may need to change the float adjustment level from 25mm to 26mm, or more. Using the "clear tube method" would be your best procedure.
Aside from buying genuine floats, hammer, cleaver, kitchen utensils, may be your only way out. If I were conspiracy minded, I'd think that these floats, and the notorious front camchain guides, are being purposely sold to eradicate old bikes, promoting new sales, continuing the "throwaway economy" mantra.
You *may* be able to save them by using slightly larger bowl screws, #8-36.
http://www.xs650.com/threads/swapping-float-bowl-screws-on-the-38s.50282/
Another zoom-in on your float pics.
This one gives makes my skin crawl.
Pretty bad tilt with that one. It *could* be dragging on the floatbowl side, and may be the one giving you problems...
This one gives makes my skin crawl.
Pretty bad tilt with that one. It *could* be dragging on the floatbowl side, and may be the one giving you problems...
Swap that one for the non leaking OEM see what happens?
Noidea
XS650 Addict
Hell yea excellent your the bomb @TwoManyXS1Bs thanks for such an in depth explanation. Ill try that stuff out this weekend and Ill seek out those bolts tomorrow. I started a new job so wont have as much time to work on my bike but itl'l at least give me some good head space so I can hit it with a clear mind. I'll also follow that thread too cool stuff . Pretty interesting concept/conspiracy you have there I wonder if thats the case the parts being made that way does seem almost intentional.
I was about to buy new oem ones but theyre close to 60 dollars for 1 from yamaha or local bike shop it just fucked if i have to maybe ill purchase them in the mean time ill fidget with the floats i have as suggested.
When I work on it and have some further things to add ill let you guys know how it goes. Thanks for all the wonderful input. I almost was losing hope in this thing you guys brought it back thanks a bunch.
I was about to buy new oem ones but theyre close to 60 dollars for 1 from yamaha or local bike shop it just fucked if i have to maybe ill purchase them in the mean time ill fidget with the floats i have as suggested.
When I work on it and have some further things to add ill let you guys know how it goes. Thanks for all the wonderful input. I almost was losing hope in this thing you guys brought it back thanks a bunch.
Gary has had good luck with the floats from 650Central, supposedly genuine Mikuni and about $18 each. Another option is getting them from Suzuki instead of Yamaha .....
https://www.partzilla.com/product/suzuki/13252-31210
https://www.partzilla.com/product/suzuki/13252-31210
