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Thread: And The Journey Begins........... Reply to Thread
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  Topic Review (Newest First)
05-30-2011 02:11 AM
OlHossCanada Link to part 2--"The Journey Continues"
https://www.vn750.com/forum/showthread.php?t=10664

Part 3, The Journey Ending
https://www.vn750.com/forum/showthrea...rney+continues
05-18-2009 01:40 PM
jthill524 Still here just waiting for some parts to show up.
04-24-2009 04:44 PM
jthill524 I believe that the main reason for oversizing is if you have some Cyl-wall scaring/scratching that is deeper than a quick honing will remove.

Quote:
Originally Posted by OlHossCanada View Post
Thanks lance. This is the first that I knew oversize pistons, etc. were available for a rebuild.

Second question. Has anyone here ever done an oversize rebuild?

jthill`s pics show his crankshaft main bearings as being ok. If an engine`s cylinder bore had enough wear to need boring out and an oversize piston, don`t you think the main and con rod bearings would need replacing too?
04-24-2009 03:57 PM
OlHossCanada
Quote:
Originally Posted by lance328 View Post
Oversized pistons and rings are available in: 0.50mm and 1.0mm over standard or 0.0197" and 0.0394".
Thanks lance. This is the first that I knew oversize pistons, etc. were available for a rebuild.

Second question. Has anyone here ever done an oversize rebuild?

jthill`s pics show his crankshaft main bearings as being ok. If an engine`s cylinder bore had enough wear to need boring out and an oversize piston, don`t you think the main and con rod bearings would need replacing too?
04-23-2009 06:37 AM
lance328
Quote:
Originally Posted by OlHossCanada View Post
Are there oversize pistons available for the VN750? I suppose the first question should be; Is the cylinder liner thick enough to be bored out for an oversize piston? If so, has anyone ever done it?

Automotive pistons used to be (and I assume still are) available oversized 10, 20 or 30 thousandths of an inch. (0.010, 0.020, 0.030").

The Clymer manual gives the max wear limit for the cyl bore at 3.3464" , and new specs at 3.3425- 3.3429.

The max wear in the bore then is 0.0035"- 0.0039", (35 to 39 TEN thousandths which equalls 3.5-3.9 thousandths of an inch.) This is less than half as much as an auto engine can be bored out to, for the first oversize rebuild.

After pondering this for a minute or two, I realize that this wear limit may indicate the point at which an overbore rebuild is called for. (I have pulled and re-installed a couple of auto engines in years past, but never actually torn one down and rebuilt it.) So what is the situation here? Is it possible to bore out a vn750 and get oversize pistons to fit?

Oversized pistons and rings are available in: 0.50mm and 1.0mm over standard or 0.0197" and 0.0394".
04-22-2009 05:34 PM
OlHossCanada
Quote:
Originally Posted by jthill524 View Post
There was only 1 head I seen. Yes I got it.
I guess those are standard Pistons.

.
Quote:
Originally Posted by lance328 View Post
They should be STD. pistons, I doubt with the milage they would have been replaced with oversized. Did you find a rear head?
Are there oversize pistons available for the VN750? I suppose the first question should be; Is the cylinder liner thick enough to be bored out for an oversize piston? If so, has anyone ever done it?

Automotive pistons used to be (and I assume still are) available oversized 10, 20 or 30 thousandths of an inch. (0.010, 0.020, 0.030").

The Clymer manual gives the max wear limit for the cyl bore at 3.3464" , and new specs at 3.3425- 3.3429.

The max wear in the bore then is 0.0035"- 0.0039", (35 to 39 TEN thousandths which equalls 3.5-3.9 thousandths of an inch.) This is less than half as much as an auto engine can be bored out to, for the first oversize rebuild.

After pondering this for a minute or two, I realize that this wear limit may indicate the point at which an overbore rebuild is called for. (I have pulled and re-installed a couple of auto engines in years past, but never actually torn one down and rebuilt it.) So what is the situation here? Is it possible to bore out a vn750 and get oversize pistons to fit?
04-22-2009 06:09 AM
lance328 I have used vasoline to assemble engines for over 20 years and never had a failure. The only place you would need it would be on the crank bearings, cams and rockers. Use new motor oil on the case bearings, rod bearings, wrist pins, pistons, rings and chains after the chains are installed. Before you start the engine pull the plugs and turn over until the oil light goes out. This way everything will have sufficient lubrication.
04-22-2009 03:21 AM
seebeeare i would use assembly oil or clean motor oil befor vasoline...
04-22-2009 03:15 AM
jthill524 What do you all think about slapping some vasoline on all the bearings and gears before I bolt the case together? That way I wouldn't starting/turning over a dry engine.
04-22-2009 02:21 AM
seebeeare ll94 i put a nice layer between the cases and a lil extra on the tabs by the cylender spots and the oilfilter i used hightack on all my gaskets to get them to seal and stick in place the mechanical seal i rubbed with a little clean oil befor i pushed her in place. when u put the impeller back be carful i ripped that little oring and had to get another one ended up finding one at a volks wagon shop for 50 cents (bow wow) i also stripped the nut on the shaft and ended up gettin a new one of those.. if i were to do it again i would make sure those threads are clean... however 98 percent of the damage was in the nut not the shaft whew... i used blue locktight on the chain guide bolts and all the shaft bolts...

i used a brass brush on a drill to clean all the surfaces befor the reinstall be patient and take your time... when u get to the heads make sure the rocker arm sits in its spot on the valve and the lifter (double check this befor u bolt down the cam bearing cap )I'm assuming u have the clymers and not sure if the kawi book shows how to bleed the lifters befor the install ... and the timing chains still marked??
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