Gen 4 over rev

fredw · Jan 18, 2018

Did a little testing this week and was having some surging in rpm up high, dealer said add some weight to pdrive arms, so we added two grams each arm and tried again..

Now it seams to be stuck on 8000 rpm on a good climb just like we want it, but max rpm on the gauge always shows 8250 to 8300

It must be over revving quicker than tack on gauge shows it, seams to happen quickly after stabbing the throttle.. Just like they have wrong profile ramps in it or something.. Basically the max rpm on the gauge is useless..

Also had a discussion with another guy that says the lower clicker on pdrive is the same as older tra, my understanding was it the opposite where you now have to increase number to pull it harder on engine and pull down rpm.. Anyone know correct way.. Currently on clicker three

Thanks all

CROW · Jan 19, 2018

Any chance your over-rev is happening when the track is off the ground?

fredw · Jan 19, 2018

Don’t think it is, is anyone else seeing this?

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jackbombay · Jan 19, 2018

fredw said:
Don’t think it is, is anyone else seeing this?

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I don't check the max RPM often, but it is usually at 8200-8300, and like you, while riding I always see 7900-8000.

fredw · Jan 19, 2018

There's gotta be some change so this does not happen, maybe a softer primary spring, differ ramp profile, motor is pulling out of its Max Tq range.. For a slight time

Thistledoo · Jan 19, 2018

Fred both mine have done this also...I think its BS as I have never seen it while making a pull. My 2018 has the alford clutch kit and so far Im very happy with this set up!!

caper11 · Jan 19, 2018

Thistledoo said:
Fred both mine have done this also...I think its BS as I have never seen it while making a pull. My 2018 has the alford clutch kit and so far Im very happy with this set up!!

What is the alford clutch setup, ive been hearing about it. Whats included?

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fredw · Jan 19, 2018

Like to here from Tom on this from Toms snowmobile.. I know he has spent a lot of time on the pdrive

revrider · Jan 20, 2018

fredw are you adding weight to the stock arms, if so where are you adding it on at ?

fredw · Jan 20, 2018

I added two gram shims to each bolt..

fynnigan · Jan 20, 2018

Found the same thing in my 18 165 , needs some weight but to much weight at the pin kind screws with the engagement. IMO it needs some more weight further out on the arm .

Andystoy · Jan 20, 2018

I don't use the max RPM function, I prefer a couple of quick glances at the tack on the first few hard pulls and call it good unless something changes.

fredw · Jan 20, 2018

I like to use the max feature like we have in the past, when I see something this far off like we are seeing, then we have clutching loss

Andystoy said:
I don't use the max RPM function, I prefer a couple of quick glances at the tack on the first few hard pulls and call it good unless something changes.

caper11 · Jan 20, 2018

fredw said:
I like to use the max feature like we have in the past, when I see something this far off like we are seeing, then we have clutching loss

You cant use the max function on a G4, the pdrive is a different animal over the tra. Even changing the clickers will affect max rpm flash.

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fredw · Jan 20, 2018

Think doo really steped into this pdrive a little soon, I don’t want a primary that takes a motor out of its tq range, maybe this is why when we raced the 850 against a xm last year onnhard pack trails it never had a chance, power is not getting to snow, even thou the motor is 10hp more.. sure makes you think who is testing these things..

caper11 said:
You cant use the max function on a G4, the pdrive is a different animal over the tra. Even changing the clickers will affect max rpm flash.

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snoblind04 · Jan 20, 2018

these big twins have never been speed demeans, look at the cat and pol 900 both 860's. I think the pdrive is a good clutch. My etechs did the same thing on max rpm.

Adam12 · Jan 21, 2018

I didn't reset my max RPM before yesterday's ride (forgot) but checked when I got home. I have 8250 listed as my max. I did see a quick 8100 when I launched fast on hardpack and mostly 7900 on climbs.

Hawkster · Jan 21, 2018

Guys ? there is no way in gods green earth that you will able to clutch any machine and be able to hold an exact RPM without over or under rev .

They have done this from the beginning of conception , technology is just allowing you to see it .

fredw · Jan 21, 2018

So the past 4 sleds all had max rpm recall and worked very well in tuning, but you feel this g4 is not in gods green earth a chance of figuring out how to dial a clutch in.. I guess we are going backwards them

Hawkster · Jan 21, 2018

Kidding right ?

It's a CVT like all CVT's they can only do so much . Now if you are saying it's pinging off of 9300 than I would be concerned and that begs to ask what this engine is programmed to shut down at ?

Go to RKTech's web sight and read up on clutching that might explain some of your concerns .

Gen 4 over rev

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