'82 70 HP "nature of the beast?"

[laurentide]

I've done a fair amount of research before posting this, but I can't seem to get a definitive answer. So, here goes.

I just rebuilt the carbs on this engine, including new floats and needle valve assemblies. It runs great. The issue I'm having is that there's a small amount of fuel mix dripping out of each carb at idle (I was running on muffs). I know the airbox catches this and recycles it into the intake area, but before I put that back on I wanted to make sure that this is normal, or should I go back to the needle valves and make a correction?

I'm asking because some say it's normal while others insist that it's a needle valve issue.

Thanks for your time, guys!

 

[racerone]

Did you set the floats level with carburetor upside down ?----Not a needle / float valve issue then.

 

[laurentide]

Yes, they're perfectly (eyeball) level with the top half of the carb when held upside down.

I'm talking a drip every 20-30 seconds at idle. Should they be dry when running?

 

[racerone]

You may be overthinking this.---How does the motor run ?

 

[laurentide]

You may be overthinking this.---How does the motor run ?

Ha! It runs fine. I do tend to overthink these things. Cheers.

 

[emdsapmgr]

I have a 96 vintage 70 3 cylinder. When idling, the top carb spits a tiny fuel out of it. It's normal. Part of the factory internal lube system for the crank. If you pull the carb off, you'll see a hole in the intake manifold which connects to internal oiling circuits. It's some type of vent. The fuel/oil mix spits from that hole-and is visibly spitting out the top carb. A tiny amount. I don't see it out of the middle or bottom carb. Maybe your vintage block has slightly different oiling passages from my later block. Mine has run great for the 7 years I've had it.

 

[laurentide]

I have a 96 vintage 70 3 cylinder. When idling, the top carb spits a tiny fuel out of it. It's normal. Part of the factory internal lube system for the crank. If you pull the carb off, you'll see a hole in the intake manifold which connects to internal oiling circuits. It's some type of vent. The fuel/oil mix spits from that hole-and is visibly spitting out the top carb. A tiny amount. I don't see it out of the middle or bottom carb. Maybe your vintage block has slightly different oiling passages from my later block. Mine has run great for the 7 years I've had it.

Yep, it's the top carb. I thought it was all three due to fuel dripping down the bottom two, but I just went out and confirmed that's it's only the top. Thanks! The engine runs like a champ with great compression. I appreciate the feedback.

I was confused because I could pump the manual primer rock hard and not get any fuel out of the carb throats.