FX-1 64x Motor Swap

G

Glamis4evr

Location
Orange County, CA
Hello,

I recently blew up my motor in my FX-1. Somebody had swapped in a 6m6 motor. I am looking to swap in either the correct 61x or preferably a 64x if possible. Is this difficult? Any posts out there to help?
 
Nuklear6

Nuklear6

I Dream 10' Surf!
Location
Bordentown, NJ by week / Brigantine, NJ by weekend
difficult to swap out?.... no different then taking your current engine out and putting it back in. The 760 is a direct bold up replacement. However, you need to keep in mind the 760 straight out of the couch has some issues. 1. ignition timing is different in the front and back cylinder (uses a mark on the flywheel trigger to identify to the cdi which cylinder it is firing). 2. The front and rear combustion chambers are different sizes, yielding less compression on the back cylinder. 3. The original 44mm carbs are "stagger" jetted to compensate for the above.

All 3 issues listed above were done purposely by yamaha because when they put the 760 in the blaster 2 w/ the 155mm pump it would actually twist the crankshaft causing many serious issues. Easiest thing to do is: uses your electronics you have on your 6m6 (bolt right to the 64x cases), get an aftermarket head, and re jet the carbs to specs that match your set up.

PS if you use your 6m6 cdi box delete the rev limiter or get an MSD Enhancer. The 760 will be constantly on the rev limiter if you keep the stock 6m6 limiter setting
 
Last edited:
PowersportComposites

PowersportComposites

Location
Fort myers
Nuklear very interesting info. I am running a 760 in my blaster right out of the couch. Could you give me a bit more into on the effect of the strange mods Yamaha did to the 760 out of the factory?
 
Nuklear6

Nuklear6

I Dream 10' Surf!
Location
Bordentown, NJ by week / Brigantine, NJ by weekend
PowersportComposites said:
Nuklear very interesting info. I am running a 760 in my blaster right out of the couch. Could you give me a bit more into on the effect of the strange mods Yamaha did to the 760 out of the factory?
Click to expand...

Just made for a more reliable engine (lower exhaust gas temps on the back cylinder) when coupled with the 155mm pump in the blaster 2. Blaster 1 and stand ups dont have the weight or pump load to twist the stock crank. So there is no reason for all of the changes yamaha made for the bigger pump. Not to mention using 61x or 62t electronics will yield a much lighter flywheel with out doing any lightening.
 
Nuklear6

Nuklear6

I Dream 10' Surf!
Location
Bordentown, NJ by week / Brigantine, NJ by weekend
Jump On It said:
Yes matching flywheel/stator 61x or 62t.
Click to expand...

61x is def the easiest electronics to use (its light, cheap, and simple). One thing about 64x electronics ive been pondering lately is the actual curve they come with stock. If my hunch is correct i would say 64x ignition curve probably retards back more at high rpm then 61x/62t. Add to this the fact that a zero lightened flywheel will make the 64x almost as light as the 61x and the fact that you can do away with the lame second trigger on the flywheel. You just might have a cheap option/ no need for a programmable ignition for all use guys running 84mm+ pistons with close to 200 psi compression. 64x ignition= $125 (been trying to sell 3 full units for a year for 100 bucks with no success)+ zero lightening service $80= 205. Which is over 200 cheaper then the only programmable charging cdi on the market.

Anyone have a map of the stock 64x ignition curve?
 
Nuklear6

Nuklear6

I Dream 10' Surf!
Location
Bordentown, NJ by week / Brigantine, NJ by weekend
Jump On It said:
Yes, If you change the 64x CDI to 61x or 62t and run a 61x flywheel.

But never run the higher voltage 62t stator with the 61x CDI.
Click to expand...

James ,

Sorry but the above isnt true. The aluminum back to the 64x e box is different and so is the wiring harness. So neither the 61x or 62t stator can be plugged in. Nor can you switch to either 61x or 62t cdi with out fabricating a mount for it in the 64x e box back (front plastic is the same on all).

And you def can run a 61x CDI with the 62t stator. Just need to change the connector on the end of the white wire with a red stripe on the CDI or make a jumper.
 
sneds

sneds

Location
Wasaga Beach
I have a similar situation. I have a 94 Blaster with a 64x motor in it.
It has an MSD enhancer and lightened stock flywheel.
I am buying a 771 big bore motor and want to drop it into the Blaster. I have no idea what electrics are in it.
Is there any way of telling what the stator and flywheel are? Off a 760 or 701 setup?
I don't know if MSD ever made an enhancer for the 760 motor. So, if my setup has an enhancer, is it safe to say the stator and flywheel are also 701 based?
 
Nuklear6

Nuklear6

I Dream 10' Surf!
Location
Bordentown, NJ by week / Brigantine, NJ by weekend
sneds said:
I have a similar situation. I have a 94 Blaster with a 64x motor in it.
It has an MSD enhancer and lightened stock flywheel.
I am buying a 771 big bore motor and want to drop it into the Blaster. I have no idea what electrics are in it.
Is there any way of telling what the stator and flywheel are? Off a 760 or 701 setup?
I don't know if MSD ever made an enhancer for the 760 motor. So, if my setup has an enhancer, is it safe to say the stator and flywheel are also 701 based?
Click to expand...

What color is the aluminum back plate to the electrical box? If its green its 64x if its black its 61x/62t.......
 
Nuklear6

Nuklear6

I Dream 10' Surf!
Location
Bordentown, NJ by week / Brigantine, NJ by weekend
sneds said:
Are you talking about the back half of the electrical box housing? If so, the entire box is black.
Click to expand...

Yes im asking about the back half (front plastic cover is same on 61x/62t/64x). If the back is black and seems like its a factory finish (ie it doesnt look like its been painted), then its 61/62t and NOT 64x. All factory 64x electrical boxes ive seen are greenish/gray.....
 
98gti

98gti

C@R H@ul3R
Location
NW FL
I saw this thread a while back and figured it would be a good place to ask. A few months back I bought a running 96 WB2, yanked the motor and bagged it up. Well today I was bored and pulled it out to just look it over. Im wondering what motor I really have. I know the wb2s are supposed to have the 760/64x motor, and it does have dual 44s. Its a sbt motor with a fresh rebuild, so who knows, but the cases say 62t, cylinders say 62t, and the head says 64x. Thats what I saw when I first pulled it and just assumed thats what it was. It does have the green backing to the e box as stated above should be 64x electronics, its got the dual pulse lines too. Im just wondering what i got, is it a 760? or a 701? Arent there 62t based 701s? Or are all motors with 62t cylinders 760s? I searched but couldnt find a straight answer for my question. Thanks.
 
Last edited:
orangefinger

orangefinger

Location
Reno,NV
its a pitty ....i kinda like the 64X stator being in the Flywheel Cover it makes it so easy to swap and reapir of needed without pulling the flywheel....
 
98gti

98gti

C@R H@ul3R
Location
NW FL
Well I definetely have 64x electronics then, I just pulled the flywheel cover and thats how its set up. My brothers got a complete 62t electronic set up hes not using, guess i'll have to sell this and get his from him if its going to hurt performance.
 
Last edited:
You must log in or register to reply here.
Top Bottom