Potential Group Purchase - Wiseco GS650 741cc pistons

[Chuck78]

Great to hear, Andy the Ace!

I may unfortunately have to throw it together for now with 673 pistons (wife taught me how many times/miles you can run a GS550 roller bearing engine with the oil light on... uuuugggghhhhhhh....), which prompted me to get on the ball to solve the missing induction system links on my end.

Yes, the vm28 kz1000 carbs appear to be able to directly swap into the gs550 rack using the gs550 fuel tee and couplers/rails.... but....

Turns out the gs750/850/1000 kz750-4/Z1-Z900/KZ1000 carb spacing lines up from what I can tell darn near PERFECT with the GS650 intake ports, wow!
The only issue is that the cam chain tunnel protrusion interferes with the carb rack. The gsxr and gs650 intake boots I have here are about 37mm tall, or rather head surface to end of carb mounting area, but the GS & KZ vm26/28 boots are a good but too short to bring the carbs away from this cam chain tunnel protrusion. And the vm26/28 intake boots have a bolt pattern that is not as wide as the bs32/bst33 carbs have that match the 650 head.

The gs650 and gixxer/katana carb boots are generally all offset up and over, but the Mikuni VM boots generally seem to go straight on with no offset.

In regards to the spacing issue and head tunnel intertference, I quickly ran out to the garage to look at my GS425 engines... BINGO! Almost all issues solved!
They have an "insulator" and gasket bolted to the head to extend the carb boots away from the head further to clear the cam chain tunnel area on them, and it looks to be the same spacing as the gs650 head and brings the carbs out just far enough!


I bought 4 more on ebay from seaching used parts under "Suzuki GS400" & "Suzuki GS425" to find listings for whatever name the seller decided to call these until I found 2 sets for cheap.

I'm not sure if this will bring the carbs out any further toward the rear of the upper double spine tubes on the feame, but long pods on a 5t0 don't ever fit well. Since these are now GS&KZ 1000/750 spacing, we can run my favorite open element air filters that are much more slender front to rear, the K&N RC-2222:



Here are 2 pictures of my GS750 with the K&N RC2222 dual oval universal filters on my vm29 smoothbores (both carbs and filters got stolen a week after these photos!!!) In the NE West Virginia (VA border) mountains. You can see lots of clearance to the frame spine behind them. An area where 550's have very little room - the reason why the similar lunchbox type filters and 88-97 600 katana carbs would be slightly problematic. I was very concerned about filter options not fitting those. We'll have to ask Boonton Mike what he did in this department, as these k&n lunchbox katana dual oval filters I have here are twice the height or horizontal installed depth as what the RC2222 filters are.



I'm not 100% guaranteeing this stuff will all work together, but aside from the bolt pattern difference between the vm26/28/29 intake boots and the 650 head/425 spacers, I am pretty certain this setup will be the hot ticket.


Also, this means VM29 smoothbores can be swapped right on!

The synch ports on gs750/1000's are in the heads, so I believe the better and cheaped choice may be 79 or so kz1000 vm28 boots as I believe they have the synch ports in the boot. You could also drill and tap them into these 400/425 spacers.

A machinist could also easily make up a replica of those 425 spacers with more meat to rotate the vm28 boot slightly away from the 650 head bolt pattern so the spacer would bolt to the head seperate from the carb boot, as one of the vm26 boot bolt holes is stacked halfway over the gs650&gs425 head bolt holes for the boots. I may slot the used vm26 boot bolt holes and use large washers to apply pressure more inward where the boot was intended, just to get it by for now.

Very excited to say the least. Now if only a Wiseco 740cc gs650e engine with megacycle cams and vm29 smoothbores would fit into my Rickman frame without custom exhaust headers, I'd be set!

This is getting better and better, and I'm thinking that if my wife gets a kz1000Ltd 1075cc tourer (since she blew up her 550 and wants a bike NOW), my gs550 rebuild for her will still be something she very much chooses to ride over the 540lb monster kawi.

Hey Guys,

I just heard back from Wiseco. They took a 3-d scan of my 650 head and said the drawing they sent me is correct!!!! I have already signed the drawing giving them permission to start manufacturing the pistons!! I am not sure when they are going to ask for the money, but I would like to start collecting from you guys now. If you guys pay up front you will get the piston sets at my cost and without the additional cost of the loan interest. I am asking $335 dollars up front. That is $80 a piston and $15 dollars for me to ship it to you guys. I will give everyone until 5:00 pm on Friday July 8th to pay me up front. After that I will take out a loan to cover the rest of the cost.

To pay me just PM me and I will send you my email address so you can send the money via paypal.

After all this time we are going to get these silly piston made!!!!

Thanks to everyone for all the help in getting this project rolling!!

Thanks,

Andy

[tkent02]

Let me know, I'll send it.

if they can't get the dimensions from the head then we will probably need one

[boontonmike]

I am willing to sell the gaskets i have at the same price i bought them for. I was just hoarding them for us in case the seller disappeared. probably around 45-55 shipped. I have 2 available. I am keeping one.

Also I have some extra 650 barrels I hoarded.

[tkent02]

Do they need a 650 piston? I have a couple extras....

Well guys I got the 650 cylinder head sent off today, so wiseco should have it by the end of the week.

[Chuck78]

GS650 top end and GS650 Vance & Hines 4 into 1:

http://www.thegsresources.com/_forum/showthread.php?240945-1978-gs1000-amp-1982-gs650

[Chuck78]

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.

[Chuck78]

Here ya go:

http://i1067.photobucket.com/albums/u429/Ace1500/Capture_zpsadkjtsfx.png

[roeme]

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.

Can you scan/upload that drawing somewhere and link it?

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.

Thanks for the offer colt, but I just got one on eBay.

That's very surprising, I had to grind away a ton of metal. What year 550 cases did you use?

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.