XR-80 Problems again
B.
So the saga continues with this stupid little bike. Its an '88 Honda XR-80.
I took your advice and rebuilt the carb and got all the gunk out of
there. I also reset the valve clearences and put an inline fuel filter
on. And its still doing the same thing but I think I know what the
problem is.
I am pretty sure that the bike needs a top end job done. The plugs are
getting fouled after 15 minutes of riding and its definetly oil on the
plugs. Not to mention the blue smoke that is coming out of the tail
pipe. Not a whole lot but you can definitely see the blue. When we
changed the oil yesterday to take a look at it, there was quite a bit of
metal shavings in it too. Not a good thing right??
So does this sound like the problem? Worn rings are allowing oil into the
cylinder and not allowing compression either.
Any other ideas???
B.
MikeOK
good manual for this one and a top end can be done for maybe around $100 or
less for a piston kit, $25 or so for boring, and you'll need a top end
gasket kit and the prices for these vairly but should be able to do the
whole job for under $200... Clymer books can be ordered here:
Any parts store can get the rest...
Mike
Pryor, OK
B. <necr...@mailcity.com> wrote in message
news:necrotic-260...@192.168.105.22...
Peter Patton
"B." wrote:
> So the saga continues with this stupid little bike. Its an '88 Honda XR-80.
>
> I took your advice and rebuilt the carb and got all the gunk out of
> there. I also reset the valve clearences and put an inline fuel filter
> on. And its still doing the same thing but I think I know what the
> problem is.
>
> I am pretty sure that the bike needs a top end job done. The plugs are
> getting fouled after 15 minutes of riding and its definetly oil on the
> plugs. Not to mention the blue smoke that is coming out of the tail
> pipe. Not a whole lot but you can definitely see the blue. When we
> changed the oil yesterday to take a look at it, there was quite a bit of
> metal shavings in it too. Not a good thing right??
>
> So does this sound like the problem?
Sounds like the next step.
> Worn rings are allowing oil into the
> cylinder and not allowing compression either.
>
> Any other ideas???
>
> B.
--
http://www.minnesotamotocross.com
Pe...@minnesotamotocross.com
Motocross Rules!!
Peter 3 # 524
Peter # 739
ICQ#59437543
B.
So Mike should I just replace the standard rings or do you think I should
bore the cylinder and replace the piston too??
I was intially under the impression that I would use the standard piston
and just put new rings on it. Or should I just go all out making sure
that the job is done right and emliminate any unforeseen problems??
What do you think??
Also should I look for excessive valve guide wear as a possible explination??
B.
In article <8glvge$rqf$1...@ionews.ionet.net>, "MikeOK" <md...@usa.net> wrote:
> Get a top end kit from Wiseco, should be a fairly easy task. Clymer makes a
> good manual for this one and a top end can be done for maybe around $100 or
> less for a piston kit, $25 or so for boring, and you'll need a top end
> gasket kit and the prices for these vairly but should be able to do the
> whole job for under $200... Clymer books can be ordered here:
>
> http://www.clymer.com
>
> Any parts store can get the rest...
>
> Mike
> Pryor, OK
>
>
>
> B. <necr...@mailcity.com> wrote in message
> news:necrotic-260...@192.168.105.22...
> >
> >
> > So the saga continues with this stupid little bike. Its an '88 Honda
> XR-80.
> >
> > I took your advice and rebuilt the carb and got all the gunk out of
> > there. I also reset the valve clearences and put an inline fuel filter
> > on. And its still doing the same thing but I think I know what the
> > problem is.
> >
> > I am pretty sure that the bike needs a top end job done. The plugs are
> > getting fouled after 15 minutes of riding and its definetly oil on the
> > plugs. Not to mention the blue smoke that is coming out of the tail
> > pipe. Not a whole lot but you can definitely see the blue. When we
> > changed the oil yesterday to take a look at it, there was quite a bit of
> > metal shavings in it too. Not a good thing right??
> >
> > So does this sound like the problem? Worn rings are allowing oil into the
MikeOK
the oil tends to run down the valve guides after the bike has sat awhile and
when you first start it again this built-up oil burns away, usually just
until it warms up. If it smokes on a warm engine you will probably need to
go a little deeper. A good manual will show the tolerances and if you can
replace the rings only, or if you will have to overbore, but in my opinion
if you are gonna go to the trouble of replacing the rings you might as well
go ahead and at least hone the cylinder and more than likely overbore and go
a size up on the piston. The small price will give you more power and the
engine will be as good as new (at least from the top end), will even give
you a bit more power. Another thing you could do is what I would have done
when I was a kid, and that is to put in a hotter plug to help with the
fouling, give it the gas and hang on hehehe.
B. <necr...@mailcity.com> wrote in message
news:necrotic-260...@192.168.105.22...
>
paul
Have you ever thought that possibly the things running a little off possibly
because the timing chain may be so slack that it is flapping around and
causing the shavings you have, I'd look into it as this would make the bike
run shitty if it is it is an easy fix, also before you tear her down why
don't you do compression check, do it dry then try putting some oil in the
cylinder and try compression check again and that will verify whether it is
a valve or ring problem. I have seen a lot of honda four strokers that burn
alot of oil and still run quite well.Good Luck! Paul
B.
Paul
What differences would I look for in the compression check with and
without oil??
The biggest problem with it buring oil is that it will run for about 15
minutes on a plug before it completely fouls it and stops running. I
honestly could care less if it burns a little oil as long it runs all day
instead of 15 to 20 minutes.
This is also why I don't think the problem is the timing chain. Or do you
think the timing is so off that oil is leaking into the cylinder through
the valves??
B.
In article <mAxX4.3628$bv6....@news2.randori.com>, "paul"
Brian McGarry
compression gauge. Get compression specs for your bike.
Test compression. If compression is low.
The next step is to figure out if the rings or valves or gaskets are leaking
compression.
Squirt a tablespoon of motor oil in spark plug hole. Let stand for a few
minutes
to allow the oil to flow down. Test compression again.
If reading increases significantly, the rings are bad and the valves and
gaskets s/b OK.
If reading doesn't increase you need to take it to a shop to get a leak down
test performed, to determine where the compression is escaping ( valves,
intake, exhaust, gasket, etc.).
Enough oil on the plug from the crankcase to foul it would be
unusual. I don't remember what your original problem was so reposting
that may help.
B.
Brian
The problem is as follows. With a new plug grounded against the cylinder
head the plug sparks just fine. Then it starts up and runs great for
about 15 minutes at which pints it croaks and won't start anymore. You
can pull the plug five minutes into it and its all carbonized and black,
wet(black) a little on the top threads but dry everywhere else, it still
sparks but not as much as the new plug. Put it back in and 5 to ten
minutes later its done for, won't spark at all. I've cleaned out the
carb, set the valve clearences, new air filter, and put a fuel filter in.
So my next step is anyones guess??
When we changed the oil there was quite a bit of metal shavings in it. So
thats what led us to believe that the rings might be bad. that and hte
blue smoke that comes out of the pipe when its running. Not a whole lot
but definetly blue smoke.
Any ideas??
B.
In article <392eb15a$0$26...@news.execpc.com>, Brian McGarry
ted
says"it's your plug cap." I was like "what?" He says "it's your plug cap.
Sometimes the resister goes bad and it will foul the plugs." Sold me a
resister cap for a couple of bucks (I think $4.75) and a new plug. Didn't
fix the smoking (probably do need rings) but it hasn't fouled a plug again
since I installed the new cap.
Yes, I think my KTM dealer (Kirk at KRW Cycles) is a genius.
Ted
B. <necr...@mailcity.com> wrote in message
news:necrotic-260...@192.168.105.22...
>
Chuck Nelson
needle. They were just worn out. I heard somewhere that this is a common
problem.
"B." <necr...@mailcity.com> wrote in message
news:necrotic-260...@192.168.105.22...
>
>
Lynd McCormick
the float was sinking. If you remove the float and shake it, it should not
rattle. If your float is sinking, there will be so much fuel that it will
wash down the wall of the cylinder and get into the crankcase. Mine would
run for a few minutes and then run like crap. I would remove the carb and
clean it again only to get a couple more minutes before it ran bad again.
When I changed the oil, you could smell fuel, I also remember seeing some
smoke. I didn't have any shavings though, that sounds a little scary. I
really don't think that bad rings would have anything to do with metal
shavings, at least not if it still runs. If it is rings, here is a trick for
you. Do a compression test, then dump some oil in the plug hole and do it
again. If your rings are leaky, the oil will raise the compression. A little
raise is normal, but if it is low and the oil makes a big difference,
they're probably bad. Your compression normally should be around 165 or so.
I also had to replace the points on mine because the throttle had a definite
dead spot in it.
Lynd
Pgh, Pa.
Chuck Nelson <nel...@neo.rr.com> wrote in message
news:Wc_X4.5868$A54.2...@typhoon.neo.rr.com...
devon...@gmail.com
> Have you ever thought that possibly the things running a little off possibly
> because the timing chain may be so slack that it is flapping around and
> causing the shavings you have, I'd look into it as this would make the bike
> run shitty if it is it is an easy fix, also before you tear her down why
> don't you do compression check, do it dry then try putting some oil in the
> cylinder and try compression check again and that will verify whether it is
> a valve or ring problem. I have seen a lot of honda four strokers that burn
> alot of oil and still run quite well.Good Luck! Paul