Engine Question

Josh · Post by **Josh** » Thu Oct 29, 2009 12:10 am

Just about a week ago I found out more info on my engine from the person who owned it the last 20+ years after tracking him down. I was told that sometime in the 80's it was fully rebuilt by a Honda tech with new parts, pistons, valves, oil pump ect. Also I was told that it was bored out 5 over! I wanted to know if boring out the cylinders makes a difference such as in performance, power and such. Out of all the other 600 engines I have worked on this engine seems to run the smoothest. Basicly I was asking if "boring" the cylinders makes a difference or not.

zinc2u · Post by **zinc2u** » Thu Oct 29, 2009 1:27 am

To answer your question .....no.
While boring can make a difference, if you are just boring the standard increments ( 0.25 mm or 1 mm), that is so insignificant compared to the piston diameter of 74 mm that it will not make a noticeable difference.
BTW....what do you mean when you say it was bored 5 over? Honda never made a piston which was 5 over.
The oversize pistons were in 0.25 mm increments up to 1.0 mm maximum.
Each 0.25 mm increment is slightly under 0.010 inches.
happy motoring,
Dale

> Just
> about a week ago I found out more info on my engine from the person who owned > it the last 20+ years after tracking him down. I was told that sometime in the > 80's it was fully rebuilt by a Honda tech with new parts, pistons, valves, oil > pump ect. Also I was told that it was bored out 5 over! I wanted to know if > boring out the cylinders makes a difference such as in performance, power and > such. Out of all the other 600 engines I have worked on this engine seems to > run the smoothest. Basicly I was asking if "boring" the cylinders makes a > difference or not.

Josh · Post by **Josh** » Thu Oct 29, 2009 5:18 pm

I am not sure, that is why I asked if anyone else knew. Maybe I could find out more info.

--- In
2cylinderhondas@yahoogroups.com
, goinhm@... wrote:
> To answer your question .....no.
> While boring can make a difference, if you are just boring the standard
> increments ( 0.25 mm or 1 mm), that is so insignificant compared to the
> piston diameter of 74 mm that it will not make a noticeable difference.
> BTW....what do you mean when you say it was bored 5 over? Honda never
> made a piston which was 5 over.
> The oversize pistons were in 0.25 mm increments up to 1.0 mm maximum.
> Each 0.25 mm increment is slightly under 0.010 inches.
> happy motoring,
> Dale
> Just about a week ago I found out more info on my engine from the person
> who owned it the last 20+ years after tracking him down. I was told that
> sometime in the 80's it was fully rebuilt by a Honda tech with new parts,
> pistons, valves, oil pump ect. Also I was told that it was bored out 5 over! I
> wanted to know if boring out the cylinders makes a difference such as in
> performance, power and such. Out of all the other 600 engines I have worked
> on this engine seems to run the smoothest. Basicly I was asking if "boring"
> the cylinders makes a difference or not.

Josh · Post by **Josh** » Thu Oct 29, 2009 11:44 pm

I forgot to ask but does anyone know why the chain roller guide wear down on one side, I have noticed that issue with a few engines I have worked on and have had to replace them. I popped off my valve cover today to check things out and noticed that my roller is starting to wear down on one side. Is this a common issue with these engines?

--- In
2cylinderhondas@yahoogroups.com
, goinhm@... wrote:
> To answer your question .....no.
> While boring can make a difference, if you are just boring the standard
> increments ( 0.25 mm or 1 mm), that is so insignificant compared to the
> piston diameter of 74 mm that it will not make a noticeable difference.
> BTW....what do you mean when you say it was bored 5 over? Honda never
> made a piston which was 5 over.
> The oversize pistons were in 0.25 mm increments up to 1.0 mm maximum.
> Each 0.25 mm increment is slightly under 0.010 inches.
> happy motoring,
> Dale
> Just about a week ago I found out more info on my engine from the person
> who owned it the last 20+ years after tracking him down. I was told that
> sometime in the 80's it was fully rebuilt by a Honda tech with new parts,
> pistons, valves, oil pump ect. Also I was told that it was bored out 5 over! I
> wanted to know if boring out the cylinders makes a difference such as in
> performance, power and such. Out of all the other 600 engines I have worked
> on this engine seems to run the smoothest. Basicly I was asking if "boring"
> the cylinders makes a difference or not.

friend · Post by **friend** » Fri Oct 30, 2009 1:13 am

Josh;
    A stretched or lose chain will cause this. It happens because the chain travels in just one direction and pulls to one side when ware and slack in the chain push it to one side of the roller over time.
     Check the article at the
http://autos.groups.yahoo.com/group/anzhonda600owners/    site, under
How to change out a cam chain
.. in the FILES area. to check your cam chain while it's in your engine.
Bill

> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > Josh > Sent:
> Thursday, October 29, 2009 10:45
> PM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> [2cylinderhondas] Re: Engine Question
> I forgot to ask but does anyone know why the chain roller guide wear down > on one side, I have noticed that issue with a few engines I have worked on and > have had to replace them. I popped off my valve cover today to check things > out and noticed that my roller is starting to wear down on one side. Is this a > common issue with these engines?
> --- In
> 2cylinderhondas@ yahoogroups. com
> ,
> goinhm@... wrote:
> > To answer your question
> .....no.
> > While boring can make a difference, if you are just
> boring the standard
> > increments ( 0.25 mm or 1 mm), that is so
> insignificant compared to the
> > piston diameter of 74 mm that it will
> not make a noticeable difference.
> > BTW....what do you mean
> when you say it was bored 5 over? Honda never
> > made a piston which was
> 5 over.
> > The oversize pistons were in 0.25 mm increments up to 1.0 mm > maximum.
> > Each 0.25 mm increment is slightly under 0.010
> inches.
> > happy motoring,
> > Dale
> > Just
> about a week ago I found out more info on my engine from the person
> who owned it the last 20+ years after tracking him down. I was told that
> > sometime in the 80's it was fully rebuilt by a Honda tech with new > parts, > > pistons, valves, oil pump ect. Also I was told that it was > bored out 5 over! I > > wanted to know if boring out the cylinders makes > a difference such as in > > performance, power and such. Out of all the > other 600 engines I have worked > > on this engine seems to run the > smoothest. Basicly I was asking if "boring" > > the cylinders makes a > difference or not.

Robert Freeman · Post by **Robert Freeman** » Sat Oct 31, 2009 4:08 pm

I have an older computer and could not read the file on the cam chain change. Has anyone ever replaced the cam chain with the engine not torn down? It looks like it could be done by attaching the new chain to the old and drawing the new chain into the engine. Then the two ends could be joined by spinning the rivet.

> ----- Original Message -----
> From:
> billmyong@...
> To:
> Anzhonda600owners
> ;
> 2cylinderhondas@yahoogroups.com
> Sent:
> Friday, October 30, 2009 3:13
> AM
> Subject:
> [2cylinderhondas] Re: Engine
> Question
> Josh;
>     A stretched or lose chain will
> cause this. It happens because the chain travels in just one direction > and pulls to one side when ware and slack in the chain push it to one side of > the roller over time.
>      Check the article at the
> http://autos. groups.yahoo. com/group/ anzhonda600owner s/ >    site, under
> How to change out a cam chain
> ..
> in the FILES area. to check your cam chain while it's in your engine.
> Bill
> > -----Original Message-----
> > From:
> > 2cylinderhondas@ yahoogroups. com
> > [mailto:2cylinderho ndas@yahoogroups .com]
> > On Behalf Of
> > Josh
> > Sent:
> > Thursday, October 29, 2009 10:45 PM
> > To:
> > 2cylinderhondas@ yahoogroups. com
> > Subject:
> > [2cylinderhondas] Re: Engine
> > Question
> > I forgot to ask but does anyone know why the chain roller guide wear down > > on one side, I have noticed that issue with a few engines I have worked on > > and have had to replace them. I popped off my valve cover today to check > > things out and noticed that my roller is starting to wear down on one side.
> > Is this a common issue with these engines?
> > --- In
> > 2cylinderhondas@ yahoogroups. com
> > ,
> > goinhm@... wrote:
> > > To answer your question
> > .....no.
> > > While boring can make a difference, if you are
> > just boring the standard
> > > increments ( 0.25 mm or 1 mm), that is so
> > insignificant compared to the
> > > piston diameter of 74 mm that it will
> > not make a noticeable difference.
> > > BTW....what do you mean
> > when you say it was bored 5 over? Honda never
> > > made a piston which
> > was 5 over.
> > > The oversize pistons were in 0.25 mm increments up to
> > 1.0 mm maximum.
> > > Each 0.25 mm increment is slightly under 0.010
> > inches.
> > > happy motoring,
> > > Dale
> > > Just
> > about a week ago I found out more info on my engine from the person
> > who owned it the last 20+ years after tracking him down. I was told that
> > > sometime in the 80's it was fully rebuilt by a Honda tech with new > > parts, > > > pistons, valves, oil pump ect. Also I was told that it was > > bored out 5 over! I > > > wanted to know if boring out the cylinders > > makes a difference such as in > > > performance, power and such. Out of > > all the other 600 engines I have worked > > > on this engine seems to run > > the smoothest. Basicly I was asking if "boring" > > > the cylinders makes > > a difference or > > not.

zinc2u · Post by **zinc2u** » Sat Oct 31, 2009 8:38 pm

What you have described is how it is done. Honda used to sell a cam chain which was split and included a master link. You would cut the old chain, attach the new chain, cycle it through manually, and then attach the master link. Then you would setup the mechanical timing.
You are on the right track.
Good luck,
Dale

> I have an older computer and could not read the
> file on the cam chain change. Has anyone ever replaced the cam chain with the > engine not torn down? It looks like it could be done by attaching the new > chain to the old and drawing the new chain into the engine. Then the two ends > could be joined by spinning the > rivet.

feltonminicycle · Post by **feltonminicycle** » Sun Nov 01, 2009 1:28 am

Take out the spark plugs first before rotating the engine. If the aluminum button is still intact on the main bearing cap, rotating the engine is the only way to roll the chain through. Keep tension on the chain or you could lose the chains and master link down inside the engine.
Miles

--- In
2cylinderhondas@yahoogroups.com
, goinhm@... wrote:
> What you have described is how it is done. Honda used to sell a cam chain
> which was split and included a master link. You would cut the old chain,
> attach the new chain, cycle it through manually, and then attach the
> master link. Then you would setup the mechanical timing.
> You are on the right track.
> Good luck,
> Dale
> I have an older computer and could not read the file on the cam chain
> change. Has anyone ever replaced the cam chain with the engine not torn down?
> It looks like it could be done by attaching the new chain to the old and
> drawing the new chain into the engine. Then the two ends could be joined by
> spinning the rivet.

TOM THIES · Post by **TOM THIES** » Sun Nov 01, 2009 9:35 am

I have never done this but I heard some where to tie a string on both ends, that way if you drop it you can retrieve both ends to start over

> ----- Original Message -----
> From:
> feltonminicycle
> To:
> 2cylinderhondas@yahoogroups.com
> Sent:
> Sunday, November 01, 2009 12:28
> AM
> Subject:
> [2cylinderhondas] Re: Engine
> Question
> Take out the spark plugs first before rotating the engine. If the aluminum > button is still intact on the main bearing cap, rotating the engine is the > only way to roll the chain through. Keep tension on the chain or you could > lose the chains and master link down inside the engine.
> Miles
> --- In
> 2cylinderhondas@ yahoogroups. com
> ,
> goinhm@... wrote:
> > What you have described is how it is done.
> Honda used to sell a cam chain
> > which was split and included a master
> link. You would cut the old chain,
> > attach the new chain, cycle it
> through manually, and then attach the
> > master link. Then you would
> setup the mechanical timing.
> > You are on the right track.
> > Good luck,
> > Dale
> > I have an older
> computer and could not read the file on the cam chain
> > change. Has
> anyone ever replaced the cam chain with the engine not torn down?
> > It
> looks like it could be done by attaching the new chain to the old and
> drawing the new chain into the engine. Then the two ends could be joined by
> > spinning the rivet.

friend · Post by **friend** » Sun Nov 01, 2009 11:44 am

I use bell copper wire (insulation stripped off), run it through twice. I have not lost one yet.
Bill

> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > TOM THIES > Sent:
> Sunday, November 01, 2009 9:36
> AM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> Re:
> [2cylinderhondas] Re: Engine Question
> I have never done this but I heard some where to tie a string on > both ends, that way if you drop it you can retrieve both ends to start > over
> > ----- Original Message -----
> > From:
> > feltonminicycle
> > To:
> > 2cylinderhondas@ yahoogroups. com
> > Sent:
> > Sunday, November 01, 2009 12:28
> > AM
> > Subject:
> > [2cylinderhondas] Re: Engine
> > Question
> > Take out the spark plugs first before rotating the engine. If the > > aluminum button is still intact on the main bearing cap, rotating the engine > > is the only way to roll the chain through. Keep tension on the chain or you > > could lose the chains and master link down inside the engine.
> > Miles
> > --- In
> > 2cylinderhondas@ yahoogroups. com
> > ,
> > goinhm@... wrote:
> > > What you have described is how it is done.
> > Honda used to sell a cam chain
> > > which was split and included a
> > master link. You would cut the old chain,
> > > attach the new chain,
> > cycle it through manually, and then attach the
> > > master link. Then
> > you would setup the mechanical timing.
> > > You are on the right
> > track.
> > > Good luck,
> > > Dale
> > > I have an
> > older computer and could not read the file on the cam chain > > > change.
> > Has anyone ever replaced the cam chain with the engine not torn down?
> > > It looks like it could be done by attaching the new chain to the > > old and > > > drawing the new chain into the engine. Then the two ends > > could be joined by > > > spinning the rivet.