Well L&G, I've removed the heads and found horror, please help..

[Droneh8tr]

83 VR,

if you all recall, my ride was burning oil badly and loosing radiator fluid which appears to have made its way to the AIRBOX as an off white gelatinous goo. I also found it in the valve covers and other places.

Well, the heads have been removed and the cylinders walls are damaged from water standing in it... ( thanks P.O.). And probably the pistons are damaged as well. It could be rebored if I could get oversized pistons and rings which Im pretty sure I can't.

So, anyone know where I can get oversized pistons and rings or am I S.O.O.L.?

Next, anyone have a 1200 engine for sale? If not, I'll check EBay and really anywhere else I think I can find one.

 

My ride is a large paperweight right now, but I don't want it to stay that way. I'm looking for input on what I can do.. I don't feel that I want to put in a 1300 unless that's all I can do..

ANY INSIGHT WOULD BE APPRECIATED.

[Prairiehammer]

Consider a 'clean-up' bore and investigate over sized pistons for the V-Max. Those V-Max guys bore out their block and get pistons all the time.

[Droneh8tr]

Consider a 'clean-up' bore and investigate over sized pistons for the V-Max. Those V-Max guys bore out their block and get pistons all the time.

So Prairiehammer let me get some clarity... I was able to find the oversized pistons and rings from various suppliers.. Is that all I would need? Meaning, my connecting rod and piston pin will be a direct fit for this new piston?

[djh3]

Should be. All you are doing is changing the size of the bore. I think on another forum I am on has a motor for sale. Dont recall if its a 1200 or 1300.

[Droneh8tr]

Should be. All you are doing is changing the size of the bore. I think on another forum I am on has a motor for sale. Dont recall if its a 1200 or 1300.

If you can find where you saw that engine I would be appreciative. I've already gotten some PMs about some engines that might be available. Right now, I'm still working on what would be my best route. A rebore would give me a new cylinder and I would add to that new pistons and rings giving me an engine who's history I know... But all that MAY come at a cost which is prohibitive.. Maybe a used engine should be my route.. I'll start really crunching some numbers today.

[john camara]

If you can find where you saw that engine I would be appreciative. I've already gotten some PMs about some engines that might be available. Right now, I'm still working on what would be my best route. A rebore would give me a new cylinder and I would add to that new pistons and rings giving me an engine who's history I know... But all that MAY come at a cost which is prohibitive.. Maybe a used engine should be my route.. I'll start really crunching some numbers today.

 

I have a complete engine from an '83 and I'm breaking it up to sell. Let me know if you need some cheap parts.

[RedRider]

How is the 2nd gear on your current motor? Might it be time to undercut the gear while you have the engine out?

 

RR

[ragtop69gs]

Before you go to all the trouble of a rebuild make sure you know the cause of the antifreeze leak. A crack in the head or block is a good possibility.

 

Sent from my SAMSUNG-SGH-I997 using Tapatalk 2

[Prairiehammer]

So Prairiehammer let me get some clarity... I was able to find the oversized pistons and rings from various suppliers.. Is that all I would need? Meaning, my connecting rod and piston pin will be a direct fit for this new piston?

 

My suggestion about the V-Max pistons was only intended to open another avenue of search and availability. The bore of the V-Max is the same as the Venture 1200, the piston wrist pin is the same as well. The V-Max pistons are different from the Venture piston but may interchange. Dingy or Squeeze can offer more accurate information about the V-Max.

 

There is a seller on eBay currently offering new 1200, 0.25mm oversize Venture pistons, Yamaha pn. 26H-11635-00-00. Unfortunately, the seller appears to have but three pistons to sell.

http://www.ebay.com/itm/One-Genuine-Yamaha-OEM-NOS-Venture-XVZ1200-26H-11635-00-00-PISTON-1-O-S-0-25-/281257391183

The stock '2nd O.S., 0.50mm' part number for the 1200 is 26H-11636-00.

Finally, consider boring the cylinder out ±3.00 mm and install 1300 Venture pistons, pn.1NL-11631-00-A0

Edit: I just discovered that if you bore the 1200 block out to 79 mm (the 1300 bore) you should/would have to resleeve the cylinder. That involves removing the old sleeve, boring the block for a larger sleeve and finally boring the sleeve for the 1300 pistons. Lots of machining and expense.

But it brings up another idea; perhaps replace the pitted sleeves on the 1200 block and use stock pistons and rings.

Edited December 1, 2014 by Prairiehammer

[Droneh8tr]

I have a complete engine from an '83 and I'm breaking it up to sell. Let me know if you need some cheap parts.

Absolutely will thanks for the offer..

[Droneh8tr]

How is the 2nd gear on your current motor? Might it be time to undercut the gear while you have the engine out?

 

RR

I was not thinking about that.. Thanks for the reminder. I'm not having any problem with 2nd but I'll consider this.

[Droneh8tr]

Before you go to all the trouble of a rebuild make sure you know the cause of the antifreeze leak. A crack in the head or block is a good possibility.

 

Sent from my SAMSUNG-SGH-I997 using Tapatalk 2

Thats something I'll definitely have to consider. I'm not even sure the best way to do that. I'll research tonight.

[Droneh8tr]

My suggestion about the V-Max pistons was only intended to open another avenue of search and availability. The bore of the V-Max is the same as the Venture 1200, the piston wrist pin is the same as well. The V-Max pistons are different from the Venture piston but may interchange. Dingy or Squeeze can offer more accurate information about the V-Max.

 

There is a seller on eBay currently offering new 1200, 0.25mm oversize Venture pistons, Yamaha pn. 26H-11635-00-00. Unfortunately, the seller appears to have but three pistons to sell.

http://www.ebay.com/itm/One-Genuine-Yamaha-OEM-NOS-Venture-XVZ1200-26H-11635-00-00-PISTON-1-O-S-0-25-/281257391183

The stock '2nd O.S., 0.50mm' part number for the 1200 is 26H-11636-00.

Finally, consider boring the cylinder out ±3.00 mm and install 1300 Venture pistons, pn.1NL-11631-00-A0

Edit: I just discovered that if you bore the 1200 block out to 79 mm (the 1300 bore) you should/would have to resleeve the cylinder. That involves removing the old sleeve, boring the block for a larger sleeve and finally boring the sleeve for the 1300 pistons. Lots of machining and expense.

But it brings up another idea; perhaps replace the pitted sleeves on the 1200 block and use stock pistons and rings.

WOW That's a lot to take in.

ILl ponder all this tonight.. I need to find out definitively if Vmax pistons will work. I'm thinking that if they do work, then having the cylinder rebored and use Vmax pistons would be the less costly option.. Thanks for continuing to give me options..

[dna9656]

So Prairiehammer let me get some clarity... I was able to find the oversized pistons and rings from various suppliers.. Is that all I would need? Meaning, my connecting rod and piston pin will be a direct fit for this new piston?

No job that entails a major engine tear down ever got done with replacing JUST parts A & B. You're going to need rings, the connecting rod and bearing will probably need work, I mean you have the classic "why you have it torn down why don't you do...a,b,c,d,e,f,g,h,i,j to it ? I don't think you want to use the old wrist pin in a new piston, the pin might be too worn, and since the crank is out maybe you should think about replacing all the bearings inside, what about the 2nd gear issue? See what I mean?

[ragtop69gs]

Thats something I'll definitely have to consider. I'm not even sure the best way to do that. I'll research tonight.

 

Magna-flux will find visable cracks, sonic testing for those that cannot be seen. Not sure if they make blockoff plates to pressure test.

 

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[djh3]

I tried to send yu a PM, but it says I am at my limit. SO need to ask the boss here whats going on. Anyways here is a thread.

[Venturous Randy]

I would not do a rebuild on a MKI 83/85 engine. For what it would cost you, you should be able to find a good MKII engine that will fit. This will also eliminate any future 2nd gear issues. If I were going with a used MKI engine, I would split the case and put a 2nd gen Venture transmission in it and then a V-Max final drive. I think you would be very happy with the results.

RandyA

[Droneh8tr]

No job that entails a major engine tear down ever got done with replacing JUST parts A & B. You're going to need rings, the connecting rod and bearing will probably need work, I mean you have the classic "why you have it torn down why don't you do...a,b,c,d,e,f,g,h,i,j to it ? I don't think you want to use the old wrist pin in a new piston, the pin might be too worn, and since the crank is out maybe you should think about replacing all the bearings inside, what about the 2nd gear issue? See what I mean?

Yeah I agree.. I see what you mean... I'll thoroughly inspect and if things are pointing towards additional work needing to be done then now would be the time to do it.

Magna-flux will find visable cracks, sonic testing for those that cannot be seen. Not sure if they make blockoff plates to pressure test.

I'll definitely ask the machine shop if they do this.. It would really be wrong to not insure this isn't a problem. Thanks for bringing it up..

Sent from my SAMSUNG-SGH-I997 using Tapatalk 2

[Droneh8tr]

I tried to send yu a PM, but it says I am at my limit. SO need to ask the boss here whats going on. Anyways here is a thread.

Thanks, I'll take a closer look at page.. Im thinking I'll be able to get some info. from here.

[djh3]

Sent you a PM again. Let me know if it made it. If not send me a PM and we will get this going for you.

[Droneh8tr]

Sent you a PM again. Let me know if it made it. If not send me a PM and we will get this going for you.

Many thanks... Got it

[djh3]

I agree on the many unexpected things pop up rebuilding. If your going to do it, you might as well figure to replace just about every wearable part in motor. Sucks, but the truth is if the motor has say 80K on it and you only put new parts in one cyl the others are 80K. Oil seals etc after sitting are not going to be as limber etc. just bad karma all the way around.

[Geobob]

I realize this is an old thread but I had to read it just because it sounded interesting. My opinion regarding the v4 engine either Yamaha or Honda is that if you have a problem that requires motor disassembly, you are probably better off finding a used motor and swapping. Unless you really enjoy the motor rebuild, it just time consuming and expensive. An 83 venture is almost worthless these days because they have been left outside and poorly cared for over the last 30 years. The motor is probably the one thing that may still be worth something. My experience has been the body work and electronics are typically a mess but the motor may still have lots of life left with some carb cleaning ect. I would shop for a used first or second gen venture and swap out the motor. That alone is no simple task.

 

As nice as this bike is ( and mine is still in excellent condition) they still don't sell for much. So getting a new used motor has got to be less than the cost of the time money for a rebuild.

[Blackmax88]

You should contact Sean Morley of Morley Muscle ( one 2 demax). Sean is a dedicated Vmax and Venture repair and engine modifier, stocks parts as well as rebuilt engines. He's quite approachable, happy to advise and knows his stuff.

Google his details and contacts. There's not much he doesn't know about both bikes.

 

PCW Racing modify the Gen I Vmax engine to 1500 cc, called the 'Tourmaster". This brute will put out around 160 RWHP with some add ons.

[BlueSky]

Does the 1200 and 1300 have the same stroke length? If not, the 1300 pistons may not work. They are probably shorter. Just thinking out loud here.

 

Never forget the Chevy mechanic in my neighborhood who bored out a 283 Chevy V8 to 4" to make it a 302 cu in engine. He used 327 cu in pistons because they were 4" instead of buying the more expensive aftermarket pistons he really needed. Only thing is, since the 327 has a 1/4" longer stroke, the pistons are 1/8" shorter. So his 302 pistons were 1/8" short of coming to the top of the block. Doh!!!