SJ vs couch mounts question

[Roseand]

Does anyone know exactly how much taller couch mounts make the motor sit than SJ?
Also, does anyone know exactly how many mm you can bring a motor down by slotting couch mounts?

 

[Quinc]

Try it. I was able to get everything to line up without shaving them down. keep everything loose and slide them out if needed to lower.

 

[Roseand]

Bump for an updated question. Wondering how much you can bring down a motor by slotting couch mounts.

 

[Christian_83]

Well im my opinion, its easier to figure out, how many mm do you need to drop your engine down.
I mean, you can get a few mm by slotting your GP mounts.
But if you need more, your prob. better off by sending your bedplates to a machine shop, to machine xx amount of materiels of, since there is more material there.

 

[faceplant2]

Curious : why are couch mounts prefered to stock mounts ? More heavy duty I presume .

 

[hornedogg79]

Mine was set up for SJ mounts and i also wanted to use couch mounts because I have several. I used a 60grit flap wheel to get them close and a belt sander to finish. Didn't take long. The difference was about 1/8".

Post in thread '-5 WDK F1pro' https://www.x-h2o.com/threads/5-wdk-f1pro.201728/post-2115821

 

[sjetrider]

I used to run couch mounts and have done all the above. slotted holes, ground the bottom and all. I found that while they are bigger, they were less dense and the OEM only SJ mounts were a better and stronger option. I tried after market of all kinds with horrible results.
I made the move to couch mounts years back because the AM SJ mounts were failing and because of the cost of OEM SJ mounts, but like a starter, I will always go OEM now.

 

[Pro-pulsion]

What I have read about SJ vs couch mounts is that the SJ mounts were a carry forward from the 650 61X engines. They're adequate to handle the 650's power and reasonably well suited for a stock 701 on a 61X base but when they moved over to the stock dual carb 62T 701, that's where they max out their limits to resist vibrabtion and directional movement. When the freestyle/freeride side of it took hold and more people began looking for bigger and better power upgrades the mounts became less and less capable of withstanding the power output and bigger air landings. I have spots on my old Kenny Keepers where my engine moved forward from doing stabs and it impacted the keepers. Once I swapped the mounts out to couch mounts that no longer has been an issue. I didn't have to do anything to the mounts either. Put them in place loosely, set the engine on them and slide it all around until the engine aligns properly to the coupler. That's all I needed to do. After that, take one bolt out at a time, blue loctite, put it back and repeat to the rest, pull the engine out enough to put the damper in and bolt the motor down after a quick realignment. I still have my stock mounts but probably won't ever be putting them back in.

 

[Roseand]

What I have read about SJ vs couch mounts is that the SJ mounts were a carry forward from the 650 61X engines. They're adequate to handle the 650's power and reasonably well suited for a stock 701 on a 61X base but when they moved over to the stock dual carb 62T 701, that's where they max out their limits to resist vibrabtion and directional movement. When the freestyle/freeride side of it took hold and more people began looking for bigger and better power upgrades the mounts became less and less capable of withstanding the power output and bigger air landings. I have spots on my old Kenny Keepers where my engine moved forward from doing stabs and it impacted the keepers. Once I swapped the mounts out to couch mounts that no longer has been an issue. I didn't have to do anything to the mounts either. Put them in place loosely, set the engine on them and slide it all around until the engine aligns properly to the coupler. That's all I needed to do. After that, take one bolt out at a time, blue loctite, put it back and repeat to the rest, pull the engine out enough to put the damper in and bolt the motor down after a quick realignment. I still have my stock mounts but probably won't ever be putting them back in.

I went with new OEM SJ mounts. It solved my engine angle and height. I actually have marks on the bottom of my old hull from couch mounts flexing and my case bolts touching.
Pretty much all pro freestylers use OEM SJ mounts, so I should be just fine. Motor mounts breaking is not the norm.

 

[waxhead]

I put a drill through the two mounting holes on the mounts and oversize them. This is always enough to allow you to slide the mounts out to lower it that 1mm. At no point would i ever run sj mounts ever again. Heck i have wrecked enough sit-downs to have a lifetime supply

 

[WFO Speedracer]

What type of oil should I be using ?

 

[jeepcreepcj]

What type of oil should I be using ?

Just buy whatever is sold in the gas station when getting fuel, so you know they are compatible…

 

[Myself]

Just buy whatever is sold in the gas station when getting fuel, so you know they are compatible…

Nope.......you really need to check the owners manual. starting in the 90's a lot of manufacturers were starting to use 5w-30. You just need to make sure that's what yours uses!

 

[WFO Speedracer]

Nope.......you really need to check the owners manual. starting in the 90's a lot of manufacturers were starting to use 5w-30. You just need to make sure that's what yours uses!

better to foul a plug than buy a jug !