600 to 771???

[Guest]

I've heard of people taking a 600 motor and comverting it to a 771. Actually I think there's a couple people on here that's done it. Something about 750 GSX-R jugs (bored 1mm) and head. Does anybody here know anything about it? If it's possible, I'd like to do it with the 600 instead of just putting a 750 in it, or even starting with a 750 because of the shorter stroke of the 600. Any help you guys can offer would be GREATLY appreciated.

[The CyberPoet]

The place to find the pistons, rings, etc. is WiseCo (www.wiseco.com). Whether it's an option on your bike, I don't know, but I'm sure wiseco will list the kit if it's available.

Cheers
=-= The CyberPoet

[Guest]

I found the piston kit, but I'm uncertain about the jugs and head. Do you think the Wiseco tech line would have any info on it? I did a little looking into it already and found that it would have to be an older 750 (87-89 I believe). Problem is, there's a 748cc and a 749cc in all 3 years, and the parts will not interchange between the two.

[The CyberPoet]

Call them. It's their specialty.

PS - by the time you pay for reboring a 600 to a 771, you'd probably find and ship a 771 engine in good shape cheaper

Cheers,
=-= The CyberPoet

[Guest]

I thought about that as well, but can't seem to find one anywhere. I can pick up the jugs and head fairly cheap, as soon as I figure out which ones I need anyway. The piston kit is around $500 from what I've seen.

[Mr. Clean]

I have done it with a 2002 600. First and fore most IT IS NOT CHEEP! Here is how my parts break down.

I started with a 98+ (2002 to be exact) low mileage 600 engine.

Used 1992 GSXR 750 jugs. Bored 1mm over and used the Wiseco 1992 771 piston/rings/wrist pin kit (found a Dennis Kirk close out deal on eBay). The 1990-1992 GSXR 750 has the same length stroke and wrist pin diameter as the 98+ 600 engine.

Used a 1986 GSXR 750 head. Had the head rebuilt with 98+ Katana 750 valve springs, keepers, and all that stuff. Used new valves for the 1986 head.

I used cams for a 1988/89 GSXR 750 because they have the most aggressive profile. Found a NOS set at my local dealership for a song. That part was dumb luck. You can use cams from 1986-89 GSXR 750, 88-2005 Katana 750, 98-2005 Katana 600, 99-2005 Bandit 1200 or 600. I don't remember the years for the GSXR 1100.

I reused the stock 2002 cam gears, chain guides, and cam chain tensioner. Get a base gasket for a 98+ Kat 750 and a head gasket from Wiseco.

I estimate that I'm putting out about 105-110 HP at the shaft. I haven't had a chance to get it on a dyno yet.

Hope that helps.

[The CyberPoet]

I have done it with a 2002 600. First and fore most IT IS NOT CHEEP

You ever sit down and figure out what the total cost on the project was for you?

Just curious...

Cheers,
=-= The CyberPoet

[Guest]

I've got a ball park figure, and it's cheaper than buying a complete new motor. I've done some research, and there's a couple more things I need to check, but I think I can make this work pretty easily, and if it does.....WHOA! I've got 98hp at the rear wheel right now out of a 600. (I guess that would actually be a B6 seeing as it's a Bandit motor) Can't wait to see what I can get out of this converted thing if I can make it work.

[Mr. Clean]

Yeah Cyber I did keep a spread sheet of everyhting I spent building the 771. If I take out all the money I spent on dress up items such as the Factory Pro covers, chromeing all the engine covers, and anodized bolts the final tally comes to about $1,200. And that isn't counting buying the engine. I sold the original 600 engine out of my bike for more than what I paid for the engine I built into the 771.