Hi Guys, ive come to a point where i need more power. I am considering over the winter to bore out my 650 to 701.Can anyone tell me if it is worth doing this?Will i loose reliability? Ive heard that the 6m6 engine is a dog and u really need to replace everything but the crank. Or is best to buy a 701 and put it in and sell my 650 engine. I really dont know what to do. Any ideas would be a great. Cheers
you definately want the 61X cylinder at least...... The yamaha motors are like this (i think): 650 (single cab) - Superjet 6m6 cases 6m6 cylinders – small ports …I think they only bore out to like 670 701 (single carb) -Superjet 61x cases – bigger reeds than 6m6 cases 61x cylinders 701 (dual carb) - Superjet 62t cases – bigger reeds than 61x cases 61x cylinders 701 (dual carb) – WaveRaider etc 62t cases 62t cylinders –still 701cc but different porting than 61x 760 (dual carb) – WaveRaider / GP760 etc 62t cases 64x cylinders – same porting as 62t cylinder but 760cc
i think 64u is the number on some of the heads....not sure which. note that ...the codes i mentioned above are the casting numbers not the numbers you see on the engine tag
650/701 Hi, was told i can bore my 6m6, 650 fx-1 to 701,, but no further... just have to clean up the ports(at least!) thanks for the chart knoxie.
Re: 650/701 i thort the fx1 only came out as a 701....all i did with my 650 superjet is took the motor out and slamed the 701 in it.heeps easyer and less pissn around...
The 701 will go on your cases you need to over bore them however the 650 cylinder with an awesome portjob will go slightly worse than a stock 701
way easier to go 701 barrels reliablity and strength are getting questionable when boring out the 650. ...and from 701 you can go bigger
Im now considering maybe buying a waveraider and swaping engines around. Putting my 650 in it and it can be the mrs ski What do you boys recommend the 701 raider engine or 760?
you probably better to get a 701 raider, as the 760 model usually runs a 155 pump which will be a bit of a struggle for the 650 to power.- the raider will be pretty underpowered anyway with a 650 However a 760 in the superjet will go real well
