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Need help troubleshooting an odd issue

  • Thread starter Thread starter THE_FATTIE
  • Start date Start date
Don't mean to argue with you chuck, but I'm gonna sorta..
I wouldn't be concerned about the screens or lack thereof on the inlet seats. Different models had different screens, and ways they went in or on. I just tore apart a set of 650 carbs today, stock, well, I'll assume stock as the mix plugs had never been removed, that had screens that just sat in the bottom of the inlet. They weren't attached to the seat. I've also opened up carbs that have no screens. And when I rebuild my carbs, I don't use the screens. My logic? Anything large enough for the screens to catch is just going to clog the screens, eventually you'll have to tear the carbs down to clean them out. Anything small enough to actually pass through the float seat is either going to cause a problem or it's not. You have, or should have, a perfectly fine screen in your petcock/tank. If its small enough to get by that, well, you're screwed either way cause those screens are about the same size. Most of the screens I've seen snap on over the inlet seat, and are made of plastic of some sort and half end up snapping when being removed. Like I said, I don't use em, and it's never been a problem the screen would have helped. Gas isn't as dirty as it was in the 70s either. So if you don't have em, don't freak out. It's not a big deal.
 
IMAG0282.jpg


I had to break all of them to get them out...

IMAG0291.jpg


And to me they dont look that dirty... But the one on the far right has some white/green crust on it... The only thing I can think is that there was water in the carb and then it dried up and left this stuff behind... Its very dry and powder like...
 
It's usually not what you can see, it's what you can't see in all of those small passages inside the bodies. They get crusty easy, and those are what most of the pilot/off idle circuit runs through. The jets and seats are brass, could have been some water in the fuel, or some of the additives in gasoline. Brass corrodes green...

Like i said, don't be freaked out over the screens, they're a nice added "filter" but IMO and experience not entirely necessary.
What you want to pay attention to however is even the seats that you didn't have to rip up to get out, that the inside of the seat didn't get scored horribly. The float needles need to be able to move smoothly and if they're nicked up badly, they may hang up in the seat bore. If theyre not terrible you may be able to clean em up with a jewelers file, but for all that work, I have many replacements if you need...
 
No arguements here..I figure they put them there for a reason..but i see your points as well. Just be 150% sure those carb boies are cleann like Josh says.
 
So I had josh rebuild my carbs and they turned out great! I put them on along with the new petcock, and within 30 seconds of cranking the bike started!

It idled around 4000 rpm until I loosened the throttle cable (dumb me)... After that I let it Idle a bit and then decided to take it for a test drive. I noticed that it seemed to have a lack of power. It seemed like it wanted to go but it just could not do it... after going about 3 blocks I pulled back into the driveway and noticed that the engine was covered in oil :( After looking a bit I noticed that it was coming from the breather hose on top of the intake. The hose had popped loose and it was dripping oil very slowly... So my question is where do I go from here? What do I check and how do I get my bike to the next level of being ready to ride all the time? I also noticed that my headlight and the lights in the gauges were not working, I know the headlight at least used to work, not sure about the tach and speedo light tho... The headlight fuse seemed fine, what do I check next?
 
As for the electrical..take off the tank and follow the guage pigtail down to the connector and clean them up..do the same inside the bucket for the headlight..clean and wiggle to be sure all is well connected. You may have some burnt out lights in the guage cluster too, but i doubt all would be out at the same time. Check the plugs and see if you at least egt something working.
 
Ill have to check the breather cover for the wire mesh things tomorrow... Thanks for the tip! also I want to take my side cover off to clean the oil window.. I think I have too much oil in the engine... Should I be able to see the oil level through the fill cap? Its pretty far down but its way higher than the sight window... All the phillips are stuck on pretty good is there a good way to get them out or is it the pb blaster and hammer and if that does not work dremil a slot?
 
No you should be able to esily see the oil thru the filler cap...if its that full then thats a hint ( to me ) that maybe the raised level is because the petcock has let fuel seep into the oil. I would smell the oil thru the cap to see if it smells of gas. Get that stuff out of there. Fill it again properly once you can determine the petcock isnt leaking fuel. Running it with gas contaminated opil is a great way to smoke your engine.
 
I actually replaced the fuel petcock and changed the oil. I could not get the oil drain off because the biggest socket I have is a 17 and I think its a 19, unless im going for the wrong bolt. So I drained the oil by taking off the filter cover and drained it there... I can see it through the filler cap, but its way down there. Its hard for me to estimate it tho. Also I hit my next snag. I was taking it for a test drive yesterday and the clutch cable snapped. Luckily I was in second at the time and home was only 2 short blocks away... Ill have to wait for my next day off to take the cover off and see if it was just the cable or something more, its down inside the panel that covers the chain for sure, but beyond that I wont know for a bit...
 
The drain plug is 21mm but you can use a 13/16" six-point socket also. ;)

Eric
 
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