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Old 12-03-2012, 07:46 PM   #1
suzy1052
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SRAD 725 Project

I got the top end tore down this weekend and fitted some parts just to make sure they fit. My main concern was making sure the Srad 750 block fit the 600 cases and they did. I've been burned before on a ZX10/11 project when the 11 block didnt fit the !0 cases after being told they would. In order to use 750 pistons I got some from an 00-03 K model 750 and they fit the 600 rods no problem. Side by side the 750 piston pin is slightly taller...maybe 1/4 mm but the 600 piston dome is actually taller so they will be the height at TDC. Ive done several big bore projects before but was amazed at how much bigger the 750 pistons are next to the 600. Still deciding on a 3 or 4 layer head gasket just to be safe. Can someone tell me if SRAD 750 cams are that much more aggressive than the 600 ? I might as well sort that out while I have everything apart.
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Old 12-04-2012, 06:32 AM   #2
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Re: SRAD 725 Project

Keep us posted. Interesting build here.
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Old 12-04-2012, 07:04 AM   #3
ccmhunt
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Re: SRAD 725 Project

I have ever some stock 750 cams if you need them...
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Old 12-04-2012, 09:40 AM   #4
suzy1052
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Re: SRAD 725 Project

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Originally Posted by ccmhunt View Post
I have ever some stock 750 cams if you need them...
How much do you want for them ? I'll see what Santawife says.
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Old 12-04-2012, 10:28 AM   #5
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Re: SRAD 725 Project

Interesting....


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Old 12-04-2012, 10:53 AM   #6
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Re: SRAD 725 Project

this thread is going south with out a red R.....
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Old 12-05-2012, 05:54 AM   #7
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Re: SRAD 725 Project

Have you not considerd a rod upgrade? By all means i dont know everything but an extra 150cc is going to put alot of stress on those rods, if your planning on using the 600 head id suggest stronger springs and hard weld cam, the last thing you want after doing a build like this is valve bounce
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Old 12-25-2012, 12:20 PM   #8
suzy1052
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Re: SRAD 725 Project

Got everything bolted back together and she fired right up. Cant ride it because of 14 inches of snow. I ended up using the 600 intake and 750 exhaust cam combo with the stock carbs and BMC race. Sounds damn good but there is a small coolant leak between the head and block between # 3 and #4 cylinder. I used a new 74mm Cometic head gasket to try and lower the compression a little but I'll either have to go with a stock head gasket or try and re-torque the cometic a little higher...maybe 36-40 ft. lbs.
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Old 12-25-2012, 06:00 PM   #9
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Re: SRAD 725 Project

Nice to know it runs, cant wait to see you get it out . I might do it to my srad. are you gonna dyno it?
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Old 01-05-2013, 02:01 PM   #10
suzy1052
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Re: SRAD 725 Project

Today I got the coolant leak fixed and even though its in the low 30's I couldnt resist testing it out. On my street there is a 2 block stretch that is snow free but thats all I needed to know that this thing has some balls now. Cracking the throttle open in 1st from low rpm results in the tire spinning on the damp pavement until it hooks up and wheelies you down the block.It reminds me a little of my old R1 the way it comes up at will. I see that the 600 is geared a little shorter than the 750 so I might changed the rear sprocket to make it more sane and less squidly.
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Old 01-06-2013, 02:32 AM   #11
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Re: SRAD 725 Project

Quote:
Originally Posted by suzy1052 View Post
Today I got the coolant leak fixed and even though its in the low 30's I couldnt resist testing it out. On my street there is a 2 block stretch that is snow free but thats all I needed to know that this thing has some balls now. Cracking the throttle open in 1st from low rpm results in the tire spinning on the damp pavement until it hooks up and wheelies you down the block.It reminds me a little of my old R1 the way it comes up at will. I see that the 600 is geared a little shorter than the 750 so I might changed the rear sprocket to make it more sane and less squidly.
can you do a write up?
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Old 04-27-2013, 07:46 PM   #12
suzy1052
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Re: SRAD 725 Project

Well I finally got it dynoed today and was pleased with the results especially since I spent less than 150.00 for the parts.

http://youtu.be/Vq5asLCAMxc
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Old 04-27-2013, 08:26 PM   #13
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Re: SRAD 725 Project

Nice, I had a 97 600 and grenaded the engine at mosport. Did an engine swap from a wrecked 98 750 for about $1600 about 12 years ago.

Nice thing was I was paying 600 insurance rates for essentially a 750 lol. Was a real sleeper too, cause the badges were still 600 so other riders were real confused when I pulled away from them so strong.

Didn't upgrade the swing arm either so it wasn't a dead giveaway. Hahahahaha.


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Old 05-15-2013, 11:35 PM   #14
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Re: SRAD 725 Project

Hello i have 98 gsxr 600 with duplix yoshirmura headers carbs done by ccm im new to the forum but im real intrested in this 725 good job i have found 2001 750 pistons i havnt bought yet because they want 132.00 for them and i still got to match 750 cyclinder my 600 your concern not matching is what im worried about what year 750 cylinder work on 600 and does the 750 camshaft have to be certain year i plan on using the duplex headers and the can is also yoshimura but ccm did some tunning to it im going to use 600 carb that he built for me just making sure having right cylinder and camshaft is my main concern and you seem to solve it.I also like to know what grimlins im going to run into.I havnt even done my profile yet so i could ask you for any help would be appreciated
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Old 05-16-2013, 12:27 AM   #15
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Re: SRAD 725 Project

I emailed dood that does the 750 crank, rods, pistons and barrels into the 600 cases using the head, he said its a straight swap but you have some can work, dial em in a I think? so you would need an adjustable sprocket.

I think you also have a few cam options as well forget which cams he used if he even mentioned it but he said with carb work he got 125 hp at the wheel, I think he said with a lightened and balanced crank you could eek out a little more?

I want to do it, that would set the SRAD up very respectable as he says he no longer has to down shift when passing.. :-)
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Old 05-17-2013, 05:20 AM   #16
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Re: SRAD 725 Project

Arh the 725 mod,yes i remember doing one of those , ended up with a great engine.
Heres what ended up with;

1999 750 barrels/pistons(balanced)/crank(lightened)
1998 600 head (i ported and skimmed)
1999 750 head gasket(thin)
Race 600 cams with Adj. cam sprockets( A MUST imo)
1998 600 carbs
K&N + AKRO full system
Gearing 15 front and 46 rear

Dyno'd at 124.8hp ATW . Happy days.
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Old 05-17-2013, 05:46 AM   #17
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Re: SRAD 725 Project

Quote:
Originally Posted by clarion6 View Post
Arh the 725 mod,yes i remember doing one of those , ended up with a great engine.
Heres what ended up with;

1999 750 barrels/pistons(balanced)/crank(lightened)
1998 600 head (i ported and skimmed)
1999 750 head gasket(thin)
Race 600 cams with Adj. cam sprockets( A MUST imo)
1998 600 carbs
K&N + AKRO full system
Gearing 15 front and 46 rear

Dyno'd at 124.8hp ATW . Happy days.
nice!
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Old 05-21-2013, 05:48 AM   #18
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Re: SRAD 725 Project

Not sure about cam on this mod I was told 750 exhaust cam use 600 intake is that right I know I have to get 98 750 cylinder but another issue is piston being 2001 k1 750 pistons suppose to have same size wrist pin is there any other years that work or just 2001 now I plan using 600 rods and crank so I need to make sure 750 pistons interchange with 98 600 rods I look on eBay for 2001 pistons but always 2001-2003 I ask seller what year size wrist pin don't get Reply will 2002,2003 work is it same size wrist pin anybody knows and on that exhaust 750 cam are you suppose to use with 600 intake cam?and do I use the 600 timing chain?Can anybody help or any information will be helpful I ask question few days ago I see some reply thank you everybody that reply like I said in my first post I'm new to this just found d this post again I have to learn also to use this forum I'm outdated not good on computer but trying to learn don't even know how to do profile I know it sad but I have buddy here on this forum monolith that help me a lot and ccm been great already bought some nice stuff from ccm and he jetted and build carbs for me.
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Old 05-21-2013, 06:03 AM   #19
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Re: SRAD 725 Project

Quote:
Originally Posted by TwistedMister View Post
I emailed dood that does the 750 crank, rods, pistons and barrels into the 600 cases using the head, he said its a straight swap but you have some can work, dial em in a I think? so you would need an adjustable sprocket.

I think you also have a few cam options as well forget which cams he used if he even mentioned it but he said with carb work he got 125 hp at the wheel, I think he said with a lightened and balanced crank you could eek out a little more?

I want to do it, that would set the SRAD up very respectable as he says he no longer has to down shift when passing.. :-)
Thank you response but I'm not changing crank or rod off 750 yet I'm just use bottom end of 600 basically put 750 top so I need to know what year 750 pistons will work I posted question more in detail what I was asking.I'm going run yoshimura duplex headers and carb done by ccm the bike is lowered has double clicker rear shock stretch just a little
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Old 05-21-2013, 08:38 AM   #20
suzy1052
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Re: SRAD 725 Project

You need 00-03 Gsxr-750 pistons and rings. 04 may work I cant remember off the top of my head. 96-99 pistons wristpin size is too big unless you want to change the crank and rods.
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