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Potential Group Purchase - Wiseco GS650 741cc pistons

  • Thread starter Thread starter Ace07
  • Start date Start date
Yeah those prices for those gaskets sound good to me. I have heard anything back from wiseco. I called them Friday and found out my contact, Ale, is gone until Tuesday. I always hate waiting. Ha ha ha
 
Chuck78 said:
Could be that these air cooled engines that run much hotter (270 degrees vs 210 water cooled) need more quench/squish band height due to different operating parameters? Heat of compression and latent heat combined is what causes detonation (like how a diesel operates intentionally).

I will research this more.
Click to expand...

I think it's the opposite. To be able to be sold in places with very hot climates they need enough cooling fins to keep the engines from burning up in the hottest conditions they would encounter anywhere. These GS engines were fine going up steep hills in desert heat, were sold in tropical places for years and I don't recall them ever having problems from getting too hot. Mine were fine in Death Valley in summer, the Arizona desert, stuck in traffic in Phoenix, just never heard of problems from running too hot. The later 16 valve engines got hotter around the heads, some needed oil coolers, but the 8 valve engines were always fine. This gives them way more than enough cooling fins to stay cool in more normal temperatures. I bet if you were to measure the temperatures in more normal operating conditions you would find them quite cool compared to similar water cooled engines.
 
Hey guys I think I messed up on grinding out my top case to make the 650 cyclinders fit. I was dumb enough to grind part of the case where the crank sits. If I found in half way will the case still work? I am such an idiot sometimes. I cut about a quarter into it.
 
Post some good photos. Use photobucket or similar and post up the IMG code. Hopefully it's not too bad.
 
I have never used photo bucket before, but I am sure it is not to hard. I will try to post some pictures. I just can't believe I did something that stupid. It was just one of those days for me

http://i1067.photobucket.com/albums/u429/Ace1500/IMG_21681_zpspvznxdrm.jpg

I also found some hair line cracks.

http://i1067.photobucket.com/albums/u429/Ace1500/IMG_21711_zpszzjgju51.jpg
http://i1067.photobucket.com/albums/u429/Ace1500/IMG_21691_zpsfefut13a.jpg

so I will probably just order a different case
 
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Ace07 said:
I have never used photo bucket before, but I am sure it is not to hard. I will try to post some pictures. I just can't believe I did something that stupid. It was just one of those days for me

http://i1067.photobucket.com/albums/u429/Ace1500/IMG_21681_zpspvznxdrm.jpg

I also found some hair line cracks.

http://i1067.photobucket.com/albums/u429/Ace1500/IMG_21711_zpszzjgju51.jpg
http://i1067.photobucket.com/albums/u429/Ace1500/IMG_21691_zpsfefut13a.jpg

so I will probably just order a different case
Click to expand...

Click on the image code, paste on the post and this will appear.





 
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That will not hurt the engine. The lines you point to are casting flow, not cracks. You did grind one bearing saddle in pretty deep though.
Doing this type of work you are much better off to do trial assemblies and let the parts talk as to what is needed to be done. The areas you ground, neither the pistons nor the cylinders go there.

On my engine case the 650 cylinders fit, tightly but they fit the 550 case. I did clean up some casting flash a bit so the cylinders set down easier is all mine needed.
 
Old Colt said:
That will not hurt the engine. The lines you point to are casting flow, not cracks. You did grind one bearing saddle in pretty deep though.
Doing this type of work you are much better off to do trial assemblies and let the parts talk as to what is needed to be done. The areas you ground, neither the pistons nor the cylinders go there.

On my engine case the 650 cylinders fit, tightly but they fit the 550 case. I did clean up some casting flash a bit so the cylinders set down easier is all mine needed.
Click to expand...

What he said. Grinding the bearing saddle down like that, I'd be a little concerned about however. That's pretty deep on one and looks like you cut into the side all the way to the bearing on another.

The "cracks" are just casting lines as said. Not cracks at all.
 
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Since it's a roller bearing engine I would agree it's OK, I might be concerned if it was going to be a highly stressed engine abused in racing or something but I bet for normal use it will be OK. Hell it's probably OK anyway, the 550s are extremely overbuilt, as indestructible as any engine ever made.
 
Old Colt said:
On my engine case the 650 cylinders fit, tightly but they fit the 550 case. I did clean up some casting flash a bit so the cylinders set down easier is all mine needed.
Click to expand...

That's very surprising, I had to grind away a ton of metal. What year 550 cases did you use?
 
I'd run that engine. The bearing saddles just hold the bearing races in place. Pretty sure that missing material won't matter.
 
I want to head and ordered a new one. I got it for $86. Those are not casting flowmarks. They actually go down into the aluminum. And they run from one bearing to the other. I guess if you guys think that it's good enough to run I will always have an extra just in case I mess up again. Ha ha ha thanks a lot for all the advice though guys. It's nice to know that there's a group of people out there that have my back.
 
tkent02 said:
That's very surprising, I had to grind away a ton of metal. What year 550 cases did you use?
Click to expand...

I have two cases to work with, a later L motor that needs grinding to work. And the cases I will be using are brand new in box. Just needed some flash cleaned up if I recall right. But it has been about a decade since I set the top end in place so maybe I should really look it over and make sure my statement was true. I also need to be sure I did not turn the bottom of the sleeves down a bit.
 
Hey guys I got an update from wiseco today. They gave me a drawing of a 3-d model that they came up with from the scetches the previous engineers made. They said they were not a 100% sure if the dome is correct, because the scetches were really hard to read. He told me if they had a piston or a cylinder head they could do a mild and verify, so I am going to send them the 650 head I got to verify. If I don't do that then there is not way of knowing a 100% whether it is correct.
 
Ace07 said:
Hey guys I got an update from wiseco today. They gave me a drawing of a 3-d model that they came up with from the scetches the previous engineers made. They said they were not a 100% sure if the dome is correct, because the scetches were really hard to read. He told me if they had a piston or a cylinder head they could do a mild and verify, so I am going to send them the 650 head I got to verify. If I don't do that then there is not way of knowing a 100% whether it is correct.
Click to expand...

Can you scan/upload that drawing somewhere and link it?
 
For the two of you that asked about finding a gs650 head and cylinders, Rice Paddy Motorcycles here in Columbus Ohio just got a second gs650 (a GS650L, complete) in that they will likely part out. The other GS650 had no exhaust on it when it came in and the valves look like they've been exposed to the elements a bit (stems discolored/white residue on them), but would probably clean up well enough to use after a valve job and head cleanup.

http://www.ricepaddy.com
Monday, Tuesday, Thursday, Friday 11am till 6pm
Saturday 11am till 5pm
Closed Wednesday and Sunday

Local and international 614-297-1404
Toll Free in the USA 1-877-460-1404

Calling them on the phone is definitely better, they are always swamped at the customer service counter and don't always have enough time to answer emails.

If you are an international customer outside of the USA, I may be able to pull the top end off 1 in a few weeks if you don't have any luck contacting the shop. They are probably closed Saturday July 9th because they always set up at AMA Vintage Motorcycle Days swap meet that Fri-Sun July 8-10.
 
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