Re: Digest Number 963

tmoc1990 · Post by **tmoc1990** » Wed Jun 08, 2005 5:49 am

I have had prints made of the upper chain guide roller, in the past new parts have been made using a material called delrin,l but there has been a heat issue and early ones have melted from the heat generated by the powerful 600cc engine. The material must be able to withstand temperatures in excess of 500 degrees in order for the part to last, I'm not sure what the cart wheels are made of but you must be careful because what every wears off falls into the bottom of the motor and can find its way into the oil pump and that is another problem on the horizon.

jpro8071 · Post by **jpro8071** » Thu Jun 09, 2005 7:45 am

I know that a chain with slack can eat into the engine case - I've
seen one or two with some minor case wear (which probably means
aluminum in the pan - also bad.)
Anyone seen a motor go completely because of the lack of a good upper
chain guide roller? I would think that a good tensioner (which some
folks like Tim rebuild/recondition) would be far more important than
this guide.

--- In
2cylinderhondas@yahoogroups.com
, tmoc1990@a... wrote:
> I have had prints made of the upper chain guide roller, in the past
>new parts have been made using a material called delrin,l but there has
>been a heat issue and early ones have melted from the heat generated by
>the powerful 600cc engine. The material must be able to withstand
>temperatures in excess of 500 degrees in order for the part to last,
>I'm not sure what the cart wheels are made of but you must be careful
>because what every wears off falls into the bottom of the motor and can
>find its way into the oil pump and that is another problem on the
>horizon.

F650CSA · Post by **F650CSA** » Thu Jun 09, 2005 11:58 am

I'm not sure about the heat and oil combination, or their chemical makeup, but years ago we used to repair shopping carts. Those damn wheels were everywhere, we tried everything to get rid of them and you couldn't hardly burn them either. The rubber just wouldn't catch. That's what made me think of them 1st.
jpro8071 wrote:

> I know that a chain with slack can eat into the engine case - I've > seen one or two with some minor case wear (which probably means > aluminum in the pan - also bad.) > Anyone seen a motor go completely because of the lack of a good upper > chain guide roller? I would think that a good tensioner (which some > folks like Tim rebuild/recondition) would be far more important than > this guide.
> --- In 2cylinderhondas@yahoogroups.com, tmoc1990@a... wrote:
> > I have had prints made of the upper chain guide roller, in the past > >new parts have been made using a material called delrin,l but there has > >been a heat issue and early ones have melted from the heat generated by > >the powerful 600cc engine. The material must be able to withstand > >temperatures in excess of 500 degrees in order for the part to > last, > >I'm not sure what the cart wheels are made of but you must be careful > >because what every wears off falls into the bottom of the motor and can > >find its way into the oil pump and that is another problem on the > >horizon.

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Steve · Post by **Steve** » Sun Jun 12, 2005 10:49 pm

The Delrin rollers melt for sure, I have pictures of one with a
nickel sized hole in the center. If the slipper falls down into the
engine the chain will slice into the front of cylinders and
eventually oil will leak out. The top of the cylinders should get
TIG welded and then you can chisel out a new pin groove or have
someone mill the groove for you. I once found a cylinder that had
the slipper Bondoed into place, I had a really hard time removing it.
Miles

Lyle · Post by **Lyle** » Mon Jun 13, 2005 12:22 am

Yea know Miles;
I use JB weld to keep all slipper pins in place. And, removing the pin
later was not all that hard. It's an extra step, but keeps that bit of
aluminum a loose pin grinds away, from working its way into the bearings.
Another area that causes a lot of problems and is almost never corrected is
the primary and secondary transmission shaft bearing keepers. Both on the
small and large bearings. The large bearing keepers on the clutch side
always seem to wear. However the other large bearing keeper doesn't. I
find that replacing them helps to keep the thrust washer and oil pump rod
from premature wear.
Bill

James · Post by **James** » Tue Jun 14, 2005 3:04 am

I have two upper chain guide rollers (new Old Stock) available for
sale. Please e-mail me if you require photos and prices including
shipping. kiwi_aircooled_honda_fan@...
James

James · Post by **James** » Wed Jun 15, 2005 12:42 am

Both Cam Chain Rollers have found a buyer in Vermont. Thanks. Sorry
for not calling people on the 'phone; I'm in New Zealand and the call
would be $$$$
James

--- In
2cylinderhondas@yahoogroups.com
, jeff segur wrote:
> Hey James. How much for both and shipping to zip 43413?
> James wrote:I have two upper chain guide rollers (new
Old Stock) available for
> sale. Please e-mail me if you require photos and prices including
> shipping. kiwi_aircooled_honda_fan@h...
> James
> --- In
2cylinderhondas@yahoogroups.com
, "Bill Colford"
> wrote:
> > Yea know Miles;
> > I use JB weld to keep all slipper pins in place. And,
removing the pin
> > later was not all that hard. It's an extra step, but keeps that
bit of
> > aluminum a loose pin grinds away, from working its way into the
> bearings.
> > Another area that causes a lot of problems and is almost never
> corrected is
> > the primary and secondary transmission shaft bearing keepers. Both
> on the
> > small and large bearings. The large bearing keepers on the clutch
side
> > always seem to wear. However the other large bearing keeper
doesn't. I
> > find that replacing them helps to keep the thrust washer and oil
> pump rod
> > from premature wear.
> > Bill
> > -----Original Message-----
> > From:
2cylinderhondas@yahoogroups.com
> > [mailto:
2cylinderhondas@yahoogroups.com
]On Behalf Of Miles Chappell
> > Sent: Sunday, June 12, 2005 10:49 PM
> > To:
2cylinderhondas@yahoogroups.com
> > Subject: [2cylinderhondas] Re: Digest Number 963
> > The Delrin rollers melt for sure, I have pictures of one with a
> > nickel sized hole in the center. If the slipper falls down into the
> > engine the chain will slice into the front of cylinders and
> > eventually oil will leak out. The top of the cylinders should get
> > TIG welded and then you can chisel out a new pin groove or have
> > someone mill the groove for you. I once found a cylinder that had
> > the slipper Bondoed into place, I had a really hard time removing it.
> > Miles
> > --- In
2cylinderhondas@yahoogroups.com
, "jpro8071"
> > wrote:
> > > I know that a chain with slack can eat into the engine case - I've
> > > seen one or two with some minor case wear (which probably means
> > > aluminum in the pan - also bad.)
> > > Anyone seen a motor go completely because of the lack of a good
> > upper
> > > chain guide roller? I would think that a good tensioner (which
> > some
> > > folks like Tim rebuild/recondition) would be far more important
> > than
> > > this guide.
> > > --- In
2cylinderhondas@yahoogroups.com
, tmoc1990@a... wrote:
> > > > I have had prints made of the upper chain guide roller, in the
> > past
> > > >new parts have been made using a material called delrin,l but
> > there has
> > > >been a heat issue and early ones have melted from the heat
> > generated by
> > > >the powerful 600cc engine. The material must be able to
> > withstand
> > > >temperatures in excess of 500 degrees in order for the part to
> > last,
> > > >I'm not sure what the cart wheels are made of but you must be
> > careful
> > > >because what every wears off falls into the bottom of the motor
> > and can
> > > >find its way into the oil pump and that is another problem on the
> > > >horizon.