rear vtwin smoking - Honda Shadow Forums : Shadow Motorcycle Forum

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Old 11-13-2012, 09:12 AM   #1 (permalink)
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Default rear vtwin smoking

well long story short, got in an "accident" sunday.
the wind blew me off the road into a ditch (60mph winds gusts) i was only going 10-15 because i just rounded a corner. I was able to lay it down while falling and I slide off of it.

it shattered my windshield, bent my clutch lever and clutch shifter. Also apparently i didnt have the antifreeze coolant lid on tight enough so that opened up and spilled everywhere on the engine. luckily fork /front suspension is still good.
My dad picked me up in my truck, loaded it and took it home. Everything overall looks good minus what i mentioned above/dings/dents and one major item that I found out last night.
I started it up last night it idles fine and works great but after about 5 min it starts puffing white smoke out of the rear v twin cylinder exhaust gasket. It's where the exhaust tube meets the engine block. After about 5 more min its spewing smoke out the end of the exhaust and the connection.


Right now I am in the middle of taking most stuff apart because i need to redo the clutch friction plates, front fork oil, and clean the carbs.
It there anything that rings a bell on why it would do that after I laid it down? I thought it might be temporary but i tried 3 separate times and its only the rear vtwin. Which tells me something got messed up.

did i crack something? is this temporary? (i doubt it) what can i check? any suggestions would be great

Edit: forgot to mention I have a 1984 honda shadow vt500c

Last edited by computerfixit524; 11-13-2012 at 10:03 AM.
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Old 11-13-2012, 11:10 AM   #2 (permalink)
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It may be that as the bike went topsy turfy that engine oil got into the cylinder. I experienced this on dropping my bike on its side. It cleared as the oil burned off. Hope you are ok!!


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Old 11-13-2012, 11:58 AM   #3 (permalink)
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Hopefully that's what it is. I know in cars white smoke is no good at all usually. I know this sounds off but smell the smoke. Does it smell like burning oil or sweet? Not sure if your bike is liquid cooled.


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Old 11-13-2012, 12:12 PM   #4 (permalink)
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It probably is oil in the cylinder. You need to check that exhaust connection and make sure both studs and nuts are intact and tightend properly. Shouldn't be any smoke coming from that connection.
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Old 11-13-2012, 12:22 PM   #5 (permalink)
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thanks, yes I am ok I just have a few scraps on my legs /ankle and im sore but other than that im good.
@gypsy I am hoping the same thing. How long did your's burn for? because I have had it on for 10 min total and it will start out barley any then start to come out moderately.

Since im guessing (hoping) its just oil being burned off, is there harm in running it/idle for a little while? it seems that its still able to cool itself and the oil pump is working.

@Shadow ghost my bike is liquid cooled. I will smell it later, currently i have my whole bike disassembled because i figured since its acting up i need to clean the carbs/sync anyway so I will to that now. It might be a week or so before I can try this.

Do anyone know if there are gaskets that hold the muffler to the engine block? maybe that's why it is smoking out the side of the engine block.

This also shows me that I need to seal that because it could be lowering my performance with pressure leaks. is this assumption correct?

I am hoping and praying that something isn't cracked. It didn't fall that hard and my leg took most of the force. Seeing as my leg is intact besides a few scratches I would say the bike is pretty much good. The side of the tank does't even have scratches.
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Old 11-13-2012, 12:30 PM   #6 (permalink)
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There are crush gaskets at the exhuast outlets. They cost about $4-5 a piece and it's not recommended to reuse old ones.
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Old 11-13-2012, 12:37 PM   #7 (permalink)
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jpr well then, I will have to get some then because i was in the middle of taking off my exhaust last night to polish it and get the rust off of it
you mean something like this? its number 2 in the diagram

http://www.bikebandit.com/houseofmot...1714#sch402079

Edit:
Edit I just looked up that normally white smoke is antifreeze not oil; oil is black smoke...siiigh

Last edited by computerfixit524; 11-13-2012 at 02:14 PM.
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Old 11-13-2012, 04:26 PM   #8 (permalink)
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Yeah coolant in the cylinders is a
Bad deal. In not sure with bikes but cars it means a blown head gasket at worst.


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Old 11-14-2012, 09:21 AM   #9 (permalink)
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Quote:
Originally Posted by Shadow ghost View Post
Yeah coolant in the cylinders is a
Bad deal. In not sure with bikes but cars it means a blown head gasket at worst.


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sooo does that mean its screwed? or do i just buy a new head gasket , replace and its fixed (if thats the problem i mean)
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Old 11-14-2012, 09:38 AM   #10 (permalink)
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Are there crash bars( highway bars ) installed on the bike? Hopefully your cylinder did not take the impact. If you have coolant burning in your cylinder, something may have cracked.


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