Converted 98 Venture to MM Question

Feeze

Feeze

Member
Joined
Jan 3, 2005
Messages
52
Age
56
Location
Saskatchewan, Canada
I have recently converted my Venture to a 144"MM. This is what I've done so far.

Removed stock tunnel extension and replace with SLP 121-144"
Relocated stock skid back 4"
Relocated W-Arm Back 4"
Rear Drop Brackets
MPI Transfer Kit

I have a 98 MSRX extended to a 151". This was a Hartman Kit, so i just copied the measurements from this for the Venture/MM conversion. The only difference is the the MSRX has rail extensions to get to 151".

The MSRX transfers like crazy since I did the MPI kit and the suspension works great.

Now my problem.

The Venture/MM feels like I'm on a stiff spring board and doesn't transfer as well as it did when I had adjustable transfer rods on the stock set up.

I have the limiter straps loose and the FRA in the top hole. I loosen the center shock to softest position and it helped a little, but still not the same as the MSRX.

I know the Venture & MM center springs have different part #'s. By moving the skid back could this be my problem?

Thanks in Advance! ;)!
 

what position is the lower rear scissor in? vertical? or leaning forward or rearward? does the fra appear level in the skid, using track as aguide? i am working on some solutions for this, but still testing. big difference between the 2 sleds is the srx has nitrogen charged shocks and the other is spring over hydraulic. i have done rolacates on over ten different yamaha models and have had ten different results. put four mpi th kits on four sleds recently and had four different results. first to try is tighting th straps to correct scissor position.
 
Thx Snowdad.

The scissor was in the straight position, so I tightened the MPI strap so it is leaning slight back. It didn't make a difference.

The limiter straps are loose and the track is laying flat on the ground and follow the rails when they tip up in the front.

I am at a loss right now. I have re-measure my holes off the MSRX and they are really close.

I just think it should transfer better with the MPI strap than the stock 136 set up with adj transfer rods.

The front shock is in the middle position.

I am having trouble loading my pics, so I could send them to you.

Thx
 
i too am at a loss. constant seems to be gas vs hydraulic. rear scissor should be vertical, or tipped slighly forward. cant get a straight answer from the engineers at mpi. they say to tighten the straps to adjust scissor, goes against their install directions. swap your shocks out sled to sled and see what happens. i am stuck in town this weekend so my r&d is out till after christmas. msrx, mm and venture all have the same lenghth shocks, mm and vt have different springs. i am bound and determined to figure this out, with or without mpi.
 
Thx again Snowdad!

I noticed you asked if the FRA "appears" level with the skid. I am not sure what you mean?

Also, you mentioned that MPI says the scissor should be Verticle or tipped forward.

It was verticle, so I tightened the strap and now it is tipped slightly back. Is this correct?

I have the skid out of the MSRX so I think I will do a change between them and see what it does. I noticed on Ronnies that the part #'s are slightly different.

8DS-47480 for the VT & 8DF-47480 for the MSRX. I am assuming the DS/DF indicates the spring.

Thx
 
shocks are totally different, but the same eye to eye lenghth. vt has steel body shock with cam adjust, srx has alum body nitrogen charged shock. as for the strap adjustment, i think you went the wrong way, but try it and see. vertical or leaning forward seems to transfer better, leaning back seems to soften the suspension, but not as much ski lift. for rhe fra level, that pivot point should make the shock appear level with the track. it was a double check for your relocate geometry. depending on how far down your mounted in the drop brackets, the forward mount needs to drop as well, in ratio, not full proportion. i will be doing some serious testing and figure this out as soon as the personal bs is over and i am back on the mountain. i hate being stuck in town on snowy weekends.
 
im having the same problem. i converted my 2003 venture 700 136" to a 151" with hartmans longtrack kit. since i relocated the front arm, moved the whole suspention back and used the rail extentions my suspention is really stiff. i got a transfer enhancement kit also. so i got a new shock and it helped a little bit but the huge spring is the problem i think. its made for 2-up riding. when i get the softer mm spring i hope all my problems are solved.
 
shocks

Remove both shocks to check binding . Are your 2 gold anodized transfer bars bent ? ( the steel bars on both sides of rear shock ) that will tell you if your cntr and rear mounts points are off . Frt mount hole can be back 4" but cntr hole will be less depending on how far you drop the suspension then it also affects rear mount point. Everything is in a arc not just 4" back
 
Just thought I would update this thread.

I have checked and re-checked all the mounts positions, bars, and etc. everthing seams correct.

Last weekend my son was doubling his friend and a couple times he was able to get it to lift the skis about a 2 feet.

I am pretty sure it has something to do with the spring tension
 
I never read this whole thread but here is my .02 If you relocated the front skid arm back you need to put a softer spring in. Hmmmmmmmmm let me think this over, your sled is a venture. I don't know what spring it used but at anyrate I think the one you need is 1.8kg/mm. Check to see what your spring rate is. Keep me posted to your progress and I will try and help you................SRXtreme
 
SRXtreme said:
I never read this whole thread but here is my .02 If you relocated the front skid arm back you need to put a softer spring in. Hmmmmmmmmm let me think this over, your sled is a venture. I don't know what spring it used but at anyrate I think the one you need is 1.8kg/mm. Check to see what your spring rate is. Keep me posted to your progress and I will try and help you................SRXtreme
Click to expand...
are you refering to front of rear or rear of rear? in my experience, the stiffer the front spring is, the more transfer, in ratio to the rear shock setup. please clarify. i can see a softer spring at the rear shock, but more spring at the front of the skid.
 
I am refering to the front(h/w arm) I fyou moved this back to mimic the '00 mountain geometry you need the softer spring.

OK you are looking for a softer ride. You need to loose some spring tension

You want more transfer, first you need the suspension to work as it is designed before you can get any transfer. You never said what engine is in this sled but the SRX has way more torque than the SX motor. Hence you will have more off the line pull - more weight transfer. You also have a 141 to a 151 difference - traction plays the major role in weight transfer. ......................SRXtreme
 
SRXtreme said:
I am refering to the front(h/w arm) I fyou moved this back to mimic the '00 mountain geometry you need the softer spring.

OK you are looking for a softer ride. You need to loose some spring tension

You want more transfer, first you need the suspension to work as it is designed before you can get any transfer. You never said what engine is in this sled but the SRX has way more torque than the SX motor. Hence you will have more off the line pull - more weight transfer. You also have a 141 to a 151 difference - traction plays the major role in weight transfer. ......................SRXtreme
Click to expand...

Its a 700 and thats makes sense SRXtreme - Thx ;)!

Now anyone have a rear/rear shock with a soft spring they want to unload?

:idea: Maybe a Phazer one would work. :dunno:
 
You must log in or register to reply here.


Back
Top