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Motorcycles » rec.motorcycles.dirt » New Thumper owner
| New Thumper owner [message #778046] |
Sun, 16 July 2006 11:46 |
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I just traded a boat for a '76 Yamaha Thumper in almost excellent
condition.. Seems to smoke quite a bit when cold. Is this a common
problem?? The previous owner said it really smokes after it's been
trailed somewhere.. I'm talkin 3 or 4 minutes mosquito control white
smoke. Cranks pretty easy after it's warmed up. Lots of power, fun to
ride.
I can remember when the Thumpers first came out and my Dad droolin over
one. Brings back lotsa memories and now, I have my own.
Any ideas on the smoke??
Paul in Anchorage.
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| Re: New Thumper owner [message #778048 ] |
Sun, 16 July 2006 12:10 |
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On Sun, 16 Jul 2006 01:46:07 -0800, Paul Jordan <pauljordan [at] gci.net>
wrote:
>I just traded a boat for a '76 Yamaha Thumper in almost excellent
>condition.. Seems to smoke quite a bit when cold. Is this a common
>problem?? The previous owner said it really smokes after it's been
>trailed somewhere.. I'm talkin 3 or 4 minutes mosquito control white
>smoke. Cranks pretty easy after it's warmed up. Lots of power, fun to
>ride.
>
>I can remember when the Thumpers first came out and my Dad droolin over
>one. Brings back lotsa memories and now, I have my own.
>
>Any ideas on the smoke??
>
>Paul in Anchorage.
My Fiances 86 DR200..smokes a very little bit at start up...my 86
XR200R doesnt smoke at all ..the DR stops after about 2
minutes...Sounds to me like you may have to replace the
rings/piston..and have the cylinder honed..Keep an eye on your oil
level....check your valve adjustments.
I am sure the others from the board can help you out more...I am out
of the loop big time since I had no bike for 3 years ...but just my 2
cents.
XRConnie....1986 XR200R
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| Re: New Thumper owner [message #778049 ] |
Sun, 16 July 2006 12:17 |
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On Sun, 16 Jul 2006 01:46:07 -0800, Paul Jordan <pauljordan [at] gci.net>
wrote:
>I just traded a boat for a '76 Yamaha Thumper in almost excellent
>condition.. Seems to smoke quite a bit when cold. Is this a common
>problem?? The previous owner said it really smokes after it's been
>trailed somewhere.. I'm talkin 3 or 4 minutes mosquito control white
>smoke. Cranks pretty easy after it's warmed up. Lots of power, fun to
>ride.
>
>I can remember when the Thumpers first came out and my Dad droolin over
>one. Brings back lotsa memories and now, I have my own.
>
>Any ideas on the smoke??
>
>Paul in Anchorage.
Anchorage?!?! That's not smoke, son, it's condensation! ;->
But seriously... white smoke is nearly always due to water in the
combustion chamber. On an air-cooled bike like yours, you can probably
rule out bad head gasket and/or cracked head/cylinder. So where is the
water coming from? I'd drain the carb and flush the tank as a first
step. And install a new fuel filter while you're at it.
Then check the oil to see if there's any water in there. Oil and
water don't mix, so if you drain the old oil you should be able to
identify any water. If the bike's been sitting outside in Alaska for a
long time condensation may indeed form inside the metal gas tank.
The only mystery is that water in the gas should also cause the
bike to run roughly, and you said it runs good. Does the smoke only
happen with the choke on? What's the ambient temperature when you're
running it? Could there be water inside the muffler/exhaust pipe? Just
curious, what size (displacement) is the bike? TT-500?
CrashTestDummy - '85 RM-250
f.j.bradfordREMOVE [at] verizon.net
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| Re: New Thumper owner [message #778064 ] |
Sun, 16 July 2006 18:20 |
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I think there may some confusion as to what constitutes "white smoke"
as opposed to gray smoke.
I'd be willing to bet it's oil leaking past the valve guides into the
combustion chamber.
Does the smoking go away when the bike is warm?
After a long, coasting, closed throttle downhill, does it puff out
some smoke when you get back on the throttle?
DJ
On Sun, 16 Jul 2006 10:17:27 GMT, CrashTestDummy
<f.j.bradfordREMOVE [at] verizon.net> wrote:
>On Sun, 16 Jul 2006 01:46:07 -0800, Paul Jordan <pauljordan [at] gci.net>
>wrote:
>
>>I just traded a boat for a '76 Yamaha Thumper in almost excellent
>>condition.. Seems to smoke quite a bit when cold. Is this a common
>>problem?? The previous owner said it really smokes after it's been
>>trailed somewhere.. I'm talkin 3 or 4 minutes mosquito control white
>>smoke. Cranks pretty easy after it's warmed up. Lots of power, fun to
>>ride.
>>
>>I can remember when the Thumpers first came out and my Dad droolin over
>>one. Brings back lotsa memories and now, I have my own.
>>
>>Any ideas on the smoke??
>>
>>Paul in Anchorage.
>
> Anchorage?!?! That's not smoke, son, it's condensation! ;->
>
> But seriously... white smoke is nearly always due to water in the
>combustion chamber. On an air-cooled bike like yours, you can probably
>rule out bad head gasket and/or cracked head/cylinder. So where is the
>water coming from? I'd drain the carb and flush the tank as a first
>step. And install a new fuel filter while you're at it.
>
> Then check the oil to see if there's any water in there. Oil and
>water don't mix, so if you drain the old oil you should be able to
>identify any water. If the bike's been sitting outside in Alaska for a
>long time condensation may indeed form inside the metal gas tank.
>
> The only mystery is that water in the gas should also cause the
>bike to run roughly, and you said it runs good. Does the smoke only
>happen with the choke on? What's the ambient temperature when you're
>running it? Could there be water inside the muffler/exhaust pipe? Just
>curious, what size (displacement) is the bike? TT-500?
>
>
>CrashTestDummy - '85 RM-250
>f.j.bradfordREMOVE [at] verizon.net
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| Re: New Thumper owner [message #778067 ] |
Sun, 16 July 2006 18:47 |
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IdaSpode wrote:
> I think there may some confusion as to what constitutes "white smoke"
> as opposed to gray smoke.
>
How about Blue smoke, I've never seen an oil burning
4-stroke engine emit anything but blue smoke while
excessively burning oil.
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| Re: New Thumper owner [message #778070 ] |
Sun, 16 July 2006 19:11 |
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On Sun, 16 Jul 2006 16:47:00 GMT, Chris Buckley
<cnbuckley [at] less.spam.earthlink.net> wrote:
>IdaSpode wrote:
>> I think there may some confusion as to what constitutes "white smoke"
>> as opposed to gray smoke.
>>
>How about Blue smoke, I've never seen an oil burning
>4-stroke engine emit anything but blue smoke while
>excessively burning oil.
You are right Chris, blue, gray, pretty much the same in my book. My
point was that pumping antifreeze through you engine will make very
white smoke, quite discernible from that resulting from burning oil.
As this bike is aircooled, it really is a moot point anyway. If it
just smokes at start-up, I'm still going for oil past the valves.
DJ
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| Re: New Thumper owner [message #785207 ] |
Mon, 17 July 2006 04:06 |
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On Sun, 16 Jul 2006 01:46:07 -0800, Paul Jordan <pauljordan [at] gci.net>
wrote:
>I just traded a boat for a '76 Yamaha Thumper in almost excellent
>condition.. Seems to smoke quite a bit when cold. Is this a common
>problem?? The previous owner said it really smokes after it's been
>trailed somewhere.. I'm talkin 3 or 4 minutes mosquito control white
>smoke. Cranks pretty easy after it's warmed up. Lots of power, fun to
>ride.
>
>I can remember when the Thumpers first came out and my Dad droolin over
>one. Brings back lotsa memories and now, I have my own.
>
>Any ideas on the smoke??
Valve guides.
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| Re: New Thumper owner [message #785214 ] |
Mon, 17 July 2006 09:04 |
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IdaSpode wrote:
> On Sun, 16 Jul 2006 16:47:00 GMT, Chris Buckley
> <cnbuckley [at] less.spam.earthlink.net> wrote:
>
>
>>IdaSpode wrote:
>>
>>>I think there may some confusion as to what constitutes "white smoke"
>>>as opposed to gray smoke.
>>>
>>
>>How about Blue smoke, I've never seen an oil burning
>>4-stroke engine emit anything but blue smoke while
>>excessively burning oil.
>
>
> You are right Chris, blue, gray, pretty much the same in my book. My
> point was that pumping antifreeze through you engine will make very
> white smoke, quite discernible from that resulting from burning oil.
>
> As this bike is aircooled, it really is a moot point anyway. If it
> just smokes at start-up, I'm still going for oil past the valves.
>
> DJ
Lots of good ideas here guys and dolls. When he cranked it up just
after taking it off the trailer, it seemed like the white (and yes, it
was white) smoke came from behind the engine with some coming out of the
tailpipe itself. It could be coming from water in the pipe as the pipe
goes down then comes back up towards the back of the bike. His comment
about it doing it mostly when it was trailered has me scratchin my head
a bit though. He also stated it hardly uses any oil at all..
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| Re: New Thumper owner [message #785238 ] |
Mon, 17 July 2006 17:18 |
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On Sun, 16 Jul 2006 23:04:21 -0800, Paul Jordan <pauljordan [at] gci.net>
wrote:
>IdaSpode wrote:
>> On Sun, 16 Jul 2006 16:47:00 GMT, Chris Buckley
>> <cnbuckley [at] less.spam.earthlink.net> wrote:
>>
>>
>>>IdaSpode wrote:
>>>
>>>>I think there may some confusion as to what constitutes "white smoke"
>>>>as opposed to gray smoke.
>>>>
>>>
>>>How about Blue smoke, I've never seen an oil burning
>>>4-stroke engine emit anything but blue smoke while
>>>excessively burning oil.
>>
>>
>> You are right Chris, blue, gray, pretty much the same in my book. My
>> point was that pumping antifreeze through you engine will make very
>> white smoke, quite discernible from that resulting from burning oil.
>>
>> As this bike is aircooled, it really is a moot point anyway. If it
>> just smokes at start-up, I'm still going for oil past the valves.
>>
>> DJ
>Lots of good ideas here guys and dolls. When he cranked it up just
>after taking it off the trailer, it seemed like the white (and yes, it
>was white) smoke came from behind the engine with some coming out of the
>tailpipe itself. It could be coming from water in the pipe as the pipe
>goes down then comes back up towards the back of the bike. His comment
>about it doing it mostly when it was trailered has me scratchin my head
>a bit though. He also stated it hardly uses any oil at all..
I don't know whether minor condensation in the pipe would be enough to
generate as lot of smoke, but I think leaky valve guides might, esp.
if the bouncy trailer-ride was also acting as a shakedown force.
-k
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| Re: New Thumper owner [message #785340 ] |
Tue, 18 July 2006 09:02 |
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DirtCrashr wrote:
> On Sun, 16 Jul 2006 23:04:21 -0800, Paul Jordan <pauljordan [at] gci.net>
> wrote:
>
>
>>IdaSpode wrote:
>>
>>>On Sun, 16 Jul 2006 16:47:00 GMT, Chris Buckley
>>><cnbuckley [at] less.spam.earthlink.net> wrote:
>>>
>>>
>>>
>>>>IdaSpode wrote:
>>>>
>>>>
>>>>>I think there may some confusion as to what constitutes "white smoke"
>>>>>as opposed to gray smoke.
>>>>>
>>>>
>>>>How about Blue smoke, I've never seen an oil burning
>>>>4-stroke engine emit anything but blue smoke while
>>>>excessively burning oil.
>>>
>>>
>>>You are right Chris, blue, gray, pretty much the same in my book. My
>>>point was that pumping antifreeze through you engine will make very
>>>white smoke, quite discernible from that resulting from burning oil.
>>>
>>>As this bike is aircooled, it really is a moot point anyway. If it
>>>just smokes at start-up, I'm still going for oil past the valves.
>>>
>>>DJ
>>
>>Lots of good ideas here guys and dolls. When he cranked it up just
>>after taking it off the trailer, it seemed like the white (and yes, it
>>was white) smoke came from behind the engine with some coming out of the
>>tailpipe itself. It could be coming from water in the pipe as the pipe
>>goes down then comes back up towards the back of the bike. His comment
>>about it doing it mostly when it was trailered has me scratchin my head
>>a bit though. He also stated it hardly uses any oil at all..
>
>
>
> I don't know whether minor condensation in the pipe would be enough to
> generate as lot of smoke, but I think leaky valve guides might, esp.
> if the bouncy trailer-ride was also acting as a shakedown force.
>
> -k
Well, today it died.. I rode it to work this morning, great ride, only
about 6 miles so I figure I had about 12 miles or so on it since I got
it from the guy and it just would not start. Eventually the neutral
light wouldn't even come on. Checked the battery and it was down to 6
volts. Nice thing is the battery only cost me $10.00 at Napa.. I
shoulda bought a case at that price.. haha.. So now, I'm charging it up
and when I hook it up and hopefully get it running, I'll put a meter
across the battery and see if it's charging or not. If not, I look
further. Hopefully it was a dying battery. The guy hadn't run the bike
since last year and I'm sure he put a quick charge on it before he
brought it over.
Still thinking about those valve guides. Once I figure out the charging
issue, might take it to the shop or my local mechanic to see what he
says. I barely smoked this morning and if that's all it's gonna do, I
can definitely live with that or a while.
Thanks for all your help guys and dolls.
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