Leave Open the Puke Tube? - Honda Rebel Forum
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post #1 of 15 Old 10-15-2019, 12:02 PM Thread Starter
 
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Leave Open the Puke Tube?

I have a buddy here at work with a Rebel. And it's what inspired me to buy my Rebel. He said he just leaves the cap off his puke tube. Aside from creepy crawlies working their way up into the puke tube, what would be the downside of just leaving it open? I'm not likely to do it, but am curious.

If the bottom end remains in its design position (in that wire holder), it would drip right of the rear tire track. But even if it dripped in line with the rear tire, I don't see it causing a problem. I'm sure we drive through oil drips from cars frequently. Sort of seems like if it were open it might facilitate that blowby make its way into the drain tube more easily. Dunno. In my case, I'll run it the way Honda intended.

2016 Honda Rebel 250 - The "Piglet."
AFR sensor equipped and downsized to a 0.105" main jet.
The only changes so far.
Bought on 6/29/19 with 44 miles.
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post #2 of 15 Old 10-15-2019, 12:05 PM
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the only problem i see is dripping on your garage floor

the benefit is not having to remember to drain it occasionally

i run my rebel without a cap

1985 CMX250 ... 1986 CMX450 ... 2005 Ruckus 50
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post #3 of 15 Old 10-15-2019, 12:33 PM
 
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I have been wondering the same thing. Will be interested to hear the replies.

One concern I had was allowing moist/humid atmosphere to reach the inside of the crankcase?

.

2016 Rebel 250 - - Black
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post #4 of 15 Old 10-15-2019, 12:52 PM
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One concern I had was allowing moist/humid atmosphere to reach the inside of the crankcase?

.
That, and dust too. How much will that affect engine longivity? I don't know, but don't want to risk it. Putting a valve in the tube makes draining it very easy.
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Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #5 of 15 Old 10-15-2019, 02:33 PM
 
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I would think, over time road grime will plug foam filter #16 of the Breather Separator,
rather than dripping into Puke tube oil/water will be pushed to the inside of air filter canister where crankcase vent terminates...

oil and paper filters are not a good mix imho
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post #6 of 15 Old 10-17-2019, 05:06 AM
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Newbie here, just to put a bow on this thread, what is the puke tube and how often should it be drained if I keep the cap on?
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post #7 of 15 Old 10-17-2019, 07:38 AM
 
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Originally Posted by VashonRebel View Post
Newbie here, just to put a bow on this thread, what is the puke tube and how often should it be drained if I keep the cap on?
drain puke tube every oil change..
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post #8 of 15 Old 10-17-2019, 08:59 AM Thread Starter
 
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I wonder how many hundredths or thousandths of a horsepower more we could get out of our neck snapping, rubber roasting Rebel if it weren't sucking in some amount of crankcase nastiness? Every hundredth of a horsepower counts when I line up next to a V Star 250 in a school zone and need to teach that lowly mis-angled 2 cylinder sap a lesson.
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2016 Honda Rebel 250 - The "Piglet."
AFR sensor equipped and downsized to a 0.105" main jet.
The only changes so far.
Bought on 6/29/19 with 44 miles.
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post #9 of 15 Old 10-17-2019, 09:23 AM
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Originally Posted by VashonRebel View Post
what is the puke tube
Behind the engine on the right side, there is a cluster of tubes. The puke tube is the only one with a plug in it.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #10 of 15 Old 10-17-2019, 11:17 AM
 
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Originally Posted by 7milesout View Post
I wonder how many hundredths or thousandths of a horsepower more we could get out of our neck snapping, rubber roasting Rebel if it weren't sucking in some amount of crankcase nastiness? Every hundredth of a horsepower counts when I line up next to a V Star 250 in a school zone and need to teach that lowly mis-angled 2 cylinder sap a lesson.
Ha!!!

This brings up a subject I have wondered about... How DOES the Rebel 250 stack up against the VStar 250, performance-wise??

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