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750 swap on a budget..

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17K views 22 replies 12 participants last post by  Samantha750  
#1 · (Edited)
Well, I know this has been done a thousand times but i just wanted to share..

The way it came about was my cousin has a K4 600 and wanted to do a 750 swap.. All the complete motors he found was between $1,200-1,500.. I told him he could get it for around $1,000 if he bought motor, ecu, etc all seperate.. Just keep a eye out and the parts will eventually show up for good prices.. And sure enough like 2 weeks later I found a motor on craigs for a good deal.. Still to much to him, he was impatient and wanted to go faster now.. So he just went and regeared it 520 -1+2 and a pc3 with a tune.. $220 for the chain and sprockets, $270 for the pc3, $120 for the tune.. Thats $600 he spent.. SMH.. So I said fuck it Ill buy the motor my self and made a bet with him I could do it for under a $1,000.. So with a budget of $800 bucks I started my swap..


This wouldnt had been possible if I didnt find such a great deal on this motor.. Thanks to 2Brothas Cycles in Maryland.. They gave me a 30 day warrenty on it.. So some things I paid a little more than I wanted to so I could have it installed and running in those 30 days..

The Bike 2005 600


2004 750 motor 12K miles.. $475


ECU.. $75


Throttle Bodies.. $100


Radiator with cooling fan.. $125
(picture is a 600 radiator)


Overflow bottle.. $20


Coils.. $20


Air box with stacks.. $50


Stock 750 headers.. Free.. I had a set from my 750..


V fairing.. Free.. I already had a spare one also from my 750..


Thats all $865.. $65 over budget.. With new spark pulgs, oil, and coolant it came to a little over $900.. Worth every bit of it.. And I sold about $200 in parts I had laying around so I really only spent $700.. Cousin is pissed cause I blow past him every chance I get lol.. I know prices may vary but I reconmend this to any body looking to step up without buying and selling another bike..
 
#2 ·
Installation took me about a week just doing a little a time.. I followed the manuel step by step..

First I took all the plastics off..


Then unhooked all wires to the motor.. No need to take the wire harness all the way off just whats connected to the motor..


After that I took the radiator, exhaust, and headers off..


Next I removed the throttle bodies..

Then I was able to drop the 600 motor.. Definitely reconmend two people for that.. I tried it by myself and almost dropped it forreal lol..


The motors side by side.. 600 on the left 750 on the right..


I followed the same process and put everything back the way i took it off and this is all back together..


I went head and did the pair valve mod also as the 600 hoses dont fit the 750.. I also kept the same gearing which was 520 -1 with the 600.. With the 750 its now -2+2.. I also kept the 600 gauges for more of the 'sleeper look'..
 
#5 ·
Thats a good deal man.. I kind of doubted myself after I spent that much money but once I started riding it it was definitly worth it..

What You Need:

Motor
ECU
Radiator with fan and overflow bottle
Throttle Bodies
Airbox with stacks
Coils - My motor didnt come with any
V fairing - the 750s is smaller
Radiator bracket - Just flip the 600s bracket upside down
PAIR valve hoses - or just do the mod and cap them off
Headers - The 600s will work on the 750 but the bolt in the back wont line up

I think thats everything.. All wires hook up the same.. Make sure you torque everything to spec and use locktite on the bolts that the manual call for it.. If you have any more questions just ask..
 
#12 ·
You should also plan for unexpected things to I guess.. just like the coils, I thought I could use the 600 coils but the 750s coils are shorter.. Another hiccup I had was after I put about 30 miles on it I got a FI light.. lol yup.. C28, my STVA went out.. but I got that fix and shes all good again..
 
#16 ·
Since I didnt have the correct hoses when doing the swap I just used caps to block off the holes on the engine and the pair valve, others chose to remove the pair valve completely but I didnt really care. I found a package of hose caps for a couple bucks at autozone and just put the caps over the holes and used the hose clamps that come on the stock hoses to help hold them on.
 
R
#22 ·
Sorry to raise a post from the dead, but I found this to be the most informative of the bunch.
I recently also completed the 600 - 750 swap. But I did this prior to reading anything and just assumed the bikes electronics and fuel system wouldn't know the diff between the two motors....
My question/concern is... I was able to start the motor today with my 600 ecu, 600 throttle bodies basically everything 600 but the motor.. am I risking long term damage by running my original parts? Why is an ECU and throttle body NEEDED?
Thanks ahead of time
 
#23 ·
The AFR on the 600 and 750 are different also, by running a 600 ecu for a 750 engine, you have raised the red line by 1000 RPM's as a 600 has a 16,000 RPM red line but the 750 has a 15,000 RPM red line. I'm sure there are other differences between the 600 and 750 as well. There is a reason why the 600/750/1000 ecu's have different part numbers and are not interchangeable.
 
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