Super Jet Superjet coupler too far?

[jetskidan]

we have an engine out of a wetjet kraze and swapped the 650 back into the wetjet with no problems.

now it comes to putting the 701 into the SN superjet and there is a gap from coupler to coupler. we tried pushing it back as far as we can and also tried to use the shims to get it a little closer, but it doesnt seem to get close enough to be comfortable with.. I checked the numbers on the engine brackets to make sure they were the same before dropping the 650 in the wetjet and they both had "6R7" on the bottom of them. we checked our blaster to see if there was as much space between the couplers and it looked the way it should be, nice and close. looks like the same engine brackets.

this is as close as we can get it, moving the shims around, and pushing the mounts as far back as possible.. anyone know why there is so much space there?

 

[Mdavies_02]

Your mid-shaft may have gradually pushed through the assembly over time. If you can measure, what is the distance between the two? 1/4"?

 

[jetx]

remove midshaft housing and measure how far back the shaft extends past the back of the housing...should be sticking out 20mm to be within spec. If it is further than this just press it back where it needs to be and reassemble.

 

[ang4th2]

doing this engine swap with my son "jetskidan" we noticed the engine mounts are NOT like a kawasaki ( what we are used to ) and they do not locate exactly like the kawis with a pin locator .. so everythng is now loose and this is the closest we can get it .. does the midshaft adjust at all ? can we removed teh coupler off the midshaft and add a washer to space it closer ? or are the engine bedplate brackets also sloppy and can be moved to one side to gain a few milimeters ?

 

[ang4th2]

thanks Robbie .. but not familiar with this midshaft set up assembly .. kawasaki doesnt have it .. so you mean 20mm towards teh coupler or you mean the parts i cant see behind the wall ? // so when i remove it ,. just unbolt it ? do i need to silicone it when reassembling ?

 

[jetx]

unbolt the 3 bolts holding it on...it needs to be sticking out 20 mm from the backside of the housing where you can't see, where it engages with the driveshaft. doesn't need to be siliconed but doesn;t hurt, depends on what shape the back of the midshaft is in that sits on the groove on the bulkhead.

 

[ang4th2]

ok .. pretty simple just removed it .. seems it is about 2.5 cm so about 25mm or slightly more .. so looks like you were correct Robbie .. hmm so now how to press it back is the question ..

 

[IS0LD0UT]

Tap it with a hammer and wood blocks

 

[jetskidan]

fixed it..

thanks robbie!

 

[ang4th2]

used my bench vise to press it back slowly .. so now back to about 20mm thanks guys !!! posted here and pwctoday .. got an answere here within mins .. and fixed within 10 mins after .. very simple once you know how .. without the knowledge we didnt know wtf we were doing ! Daniel will post up some after pics maybe usefull for the next yamaha newbie !

 

[jetx]

No problem...glad to help. Got to love the power of the internet.

 

[ang4th2]

here it is on the computer desk when i measured it
and now .. chill and have a beer .. continue tommorow .. when its much warmer in the garage

 

[D-Roc]

Nice work boys. Be sure to shim the motor perfect to the midshaft. Be very fussy.

 

[jetskidan]

before we actually drop everything in i think we should defoam, and add some footholds..

 

[D-Roc]

You have to, it is a matter of safety.

 

[jduplease2002]

Glad I found this thread. I was looking up something completely different. I have this same issue and couldn't find info on it anywhere. Thanks a lot.

 

[jetskidan]

This ski is going to be up for sale as soon as we install the other engine.. we found a better hull for freestyle and are swapping the 736 into the other hull and selling this one with a stock 701. i will post it in the skis for sale when we get the motor bolted down!

 

[kevbo]

we have an engine out of a wetjet kraze and swapped the 650 back into the wetjet with no problems.

now it comes to putting the 701 into the SN superjet and there is a gap from coupler to coupler. we tried pushing it back as far as we can and also tried to use the shims to get it a little closer, but it doesnt seem to get close enough to be comfortable with.. I checked the numbers on the engine brackets to make sure they were the same before dropping the 650 in the wetjet and they both had "6R7" on the bottom of them. we checked our blaster to see if there was as much space between the couplers and it looked the way it should be, nice and close. looks like the same engine brackets.

this is as close as we can get it, moving the shims around, and pushing the mounts as far back as possible.. anyone know why there is so much space there?

View attachment 176310View attachment 176311

It looks the same as every other SN coupler coupler that I have ever seen. The shaft bottoms in the bearing so it cant go deeper than intended.

 

[Matt_E]

It looks the same as every other SN coupler coupler that I have ever seen. The shaft bottoms in the bearing so it cant go deeper than intended.

OEM spec is 19.5-20.5mm. The man measured 25mm.
I'd say it can go deeper. (And have seen it plenty of times)