860 not shifting arms fully out

[Stucky]

Hello I have an 860 with joe's helix and a stock secondary spring. In the primary I have a the purple/pink (160/350) I do have 2mm oversized rollers aswell.

with a total tip weight of 16.7g, 5g of that is the oversized rollers. and I can only get 8000 rpm on the flats. cliker 2 and 4 same rpm

with an additional 1.8g in the pin (18.5g) I could only see 7900 max on clicker 2 and 4 as well
both times it pulls a little harder on clicker 2

I markerd the inside of the primary and my ramps with a black marker. I know that my primary is not shifting out as there is close to 3/4 of and inch of black marker left on the inside of the primary, and close to a 1/2 an inch on the ramps that were not even touched.

This motor is supose to pull at 7900-8000 rpm, but I would like to see my arms fully shift out?? what dirrection should a guy go with this set up now???

Thanks Stucky

 

[Throttle Junkie]

So you are on target RPM.

Where are you testing shift out? Gearing plays a huge part in this. As for climbing you will never see full shift out with a NA 860. You need big HP and turbos usually to achieve full shift out while climbing and depending on the gearing you will probally have to be up around 90mph before you are close to full shift on the trail....

 

[Dynamo^Joe]

I love this series of questions about "belt mark"

Ok answer these questions....

Rated engine rpm?
Top gear?
Bottom gear?
Driver size?
What track speed you get under full throttle (latest conditions)

answer and i'll explain in further detail

 

[Stucky]

I love this series of questions about "belt mark"

Ok answer these questions....

Rated engine rpm?
Top gear?
Bottom gear?
Driver size?
What track speed you get under full throttle (latest conditions)

answer and i'll explain in further detail

Rated engine rpm 8000
Top Gear is stock 21
Bottom gear is stock 45
Driver size is stock

I was not looking at track speed, only rpm's, it pulls hard trough the mid range and falls off at top end. I have been testing in the flats with fresh layer of snow under a set up layer.

 

[DaveB]

What mph were you getting to? What track? What year of sled? What ramps are in there? 21/45 gearing (probably a 154) and clutches 3/4 inch from the top is going to be pretty fast...like 90 or so I'm guessing. That's a lot of drag on a long track.....

Depending on ramp...oversized rollers make the ramp act "taller"...like a higher clicker. Higher clickers do not generally upshift as readily as lower clicker numbers.

 

[Dynamo^Joe]

@ 8000 rpms
89mph @ 1:1 = approx 2.7 inches from the rim of the primary.
107mph @ full shift overdrive = 3.375 inches

Take your measureing tape and measure from the stub and I have no doubt that the bottom of the felt marker is approximately 2.7 inches from the stub.

To wipe the felt marker completely off you would have to go 107 mph with present gear/rpm.

To wipe the felt marker completely off at 90 mph then you would have to gear 18:46 at 8000 rpms

Revzone Gear Calculator

 

[Dynamo^Joe]

it pulls hard trough the mid range and falls off at top end

In your case, "top end" would be 107 mph.
"Tops out" would be at "X" mph that the sled ceased to increase mph.

It pulls hard through the midrange and tops out at "X" mph; about 18 mph less than full shift.

------------------------
Next questions

What sled model/year?
In general conditions to where you can drive this sled the fastest; What reasonable peak mph would you like to observe with your sled?

 

[Stucky]

In your case, "top end" would be 107 mph.
"Tops out" would be at "X" mph that the sled ceased to increase mph.

It pulls hard through the midrange and tops out at "X" mph; about 18 mph less than full shift.

------------------------
Next questions

What sled model/year?
In general conditions to where you can drive this sled the fastest; What reasonable peak mph would you like to observe with your sled?

The sled is an 08 163 X. and now that I need to find out the MPH, I'm going to go for a little ride in the field and see what my mph are.

 

[SnowSnob]

If you clicker up and there's no change in RPMS then there's a good chance your running too rich.

 

[Stucky]

If you clicker up and there's no change in RPMS then there's a good chance your running too rich.

I jetted down to 460 from 490 and on clicker 2 it reved 8100 and track speed was 64mph, clicker 4 I saw 8400 and 56mph. I also counted the bottom gear and I stand corrected it is a 49 tooth not a 45 tooth.

 

[Throttle Junkie]

If you clicker up and there's no change in RPMS then there's a good chance your running too rich.

there are may to many things that could effect that to jump to the conclusion that's it rich...

 

[triple7]

I jetted down to 460 from 490 and on clicker 2 it reved 8100 and track speed was 64mph, clicker 4 I saw 8400 and 56mph. I also counted the bottom gear and I stand corrected it is a 49 tooth not a 45 tooth.

Is this track speed in a climb?? Or track speed on a flat meadow or road??

 

[ReTodd]

Is this track speed in a climb?? Or track speed on a flat meadow or road??

Yeah, I'd like to see 64mph track speed in 3' of snow on a steep climb. Don't think so. You want to measure true track speed, pull up to a steep hill off the tracks and stop right at the bottom. Then giver er WOT and when you are only going about 5mph then check your track speed. Otherwise, if you are going 15mph cause you poached track your track speed will be higher and will not give you an indication of anything.

Regarding your shift out, mine shifts out about that far now (used to shift out more) but I carry the same track speed in the deep with much faster up-shift so it is irrelevant to me.

Rt

 

[Stucky]

Well I just got back from the mountains tonight. Saturdays ride was a blue blazer sunny day with fresh snow. I was seeing track speeds of 39mph with the best pulls in fresh being 44 mph. The sled was working well with joes clutching set up. I would like to find a little softer starting spring may be a blue pink (130/350)
I thought the 160 was a little to high of engagment.

On day number two (Sunday) it was socked in and just played around in the trees. sled was running good untill we hit the trail on the way down
The temp light started blinking and them the check engine knock sensor came on. Elevation was 2500 feet, I could not get the knock sensor to go any. Still pulled hard on the trail, and the plugs looked golden brown? By the sounds of it I will have to go to the dealer and get the codes flashed. This will be the second time I have had to have the codes flashed.