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update # 3 Okay, I'm very scared to touch it now because we have success. Turned the petcock on and the carbs didn't fill back up with gas. It must have been the crooked way the carbs were on there not letting the floats seat properly/the needle position letting the gas in. Or a combination of...

I have no problems with gas coming from the petcock into the carbs overnight. So this test doesn't help me. My problem is the gas left over in the carbs after the bike is shut off drains into the engine. Even if the petcock isn't connected to the carbs the remaining gas still flows into the...

update #2 fixed problem #1: Floats set to wrong height from factory. Set them up right. fixed problem #2: Manifolds are very cheap and don't have a notch that matches the carbs which means you can't just stick the carbs on without leveling them. noticed that the left one (the gas spewing...

Update: ooookay new oil. Took the bike down the road and I can see bubbles in the in-line fuel filter... turned around parked the bike and fuel started coming out the left side carb overflow... now i'm really confused... bubbles?! is that an air leak? I turned it to reserve while driving and...

They better not be lol. I'll keep updating after I go try some stuff on it. thanks guys

Carbs are aftermarket not the original that come with the bike. they are 32mm Keihin carbs. I haven't had them opened yet (just got them last week). crank case vent going to a filter on right hand side had it off before and nothing comming out of it, havn't checked it since last year though.

spark plugs are black with soot. I mean I know the bike runs rich. I have never measured it with anything that has accurate measuring lines but I do know when I go to put the old oil into the jugs it came in it never fits back in and I usually make a fracing mess to and it still doesn't fit in...

Compression test was good, cold bike: 151 on right side 149 on the left. that is within spec so I didn't put it back together for a warm run. Should I do that/ what is next? Next is making the bike level to test float screwiness (real word I swear). Any other ideas?

when it sits is the main problem, honestly I don't drive it that much. I'd say 95% is when it sits. 5% while driving probably from just having a rich condition/semi bad rigs. after I do the compression test i'm going to try and level up the bike a bit to see if that makes any difference like...

Going to get a compression tester today and about 30 quarts of oil :laugh: will see what I can find out. thanks guys keep the ideas coming :thumbsup:

I'm closing the petcocks every time for sure. I have manual petcocks (on/off/reserve). As far as amount of gas in the oil it is relative to how many times I fill the carbs up. If I don't touch the bike for 7 days then I only have what was in the carbs in the oil. If I let the carbs fill up...

plugs are black and also foul a lot. I never could get the old bs34's to run right, I haven't tuned these new carbs up yet frankly because I don't want to drive around with gas in the oil. But they are good at idle, i just need to drop down the main jet and maybe a needle position. The filters...

The only gas that is left in the the morning is a bit in the fuel lines as far as I can tell. If I drain the carbs without turning on the petcock about 1/2 of a shot glass comes out of each. so like 1 oz total. new tank (cleaned and sealed inside), manual petcock (on/off/reserve) which...

I haven't tried that. I'm sure it's not dumping fuel in it because I have a clear fuel filter and I can see that it doesn't flow when fuel is shut off or petcock disconnected. I'd say it takes about 8 - 12 hours of sitting for all the fuel from the carbs to get into the engine. seems rings are...

Yeah I changed them on the BS34's and it didn't help. They aren't on the bike anymore because I got the "XS Performance Keihin Carb Kit" first item here http://www.xs650direct.com/products-82.html

I guess I'm about to get acquainted with my engine. So we are pretty sure it's the rings, I don't have a compression tester, should I go get one and do that first? What's the spec 150psi or so?

I'm pretty amateur when it comes to engines, I mean I understand the basics but how do rings prevent gas from getting into the crankcase? I mean most times it hasn't even run in between oil changes, is that indicative of bad rings? I assume you mean piston rings. Sry for my lack of knowledge...

I have manual petcocks do I really need an inline fuel valve as well? The petcock isn't letting gas in the carbs at all when turned off. I am checking first by smell and then by visually checking the oil when I drain it. It only leaks what's in the carbs into the oil so volume isn't really...

I have had this problem for a long time now. Fuel in the oil. I have done many things to remedy the problem but nothing seems to work. I'll start you on this journey of mine with some info. I have a 1981 xs650 special with 30,000 miles on it. I bought the bike hoping to turn it into a...