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 Post subject: Powerbloc fl400
PostPosted: Thu Feb 08, 2018 4:05 pm 
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Joined: Mon Jan 26, 2015 10:11 am
Posts: 474
Put new powerbloc clutch today not engaging fully. More weights or less in pucks? Picture of clutch


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 Post subject: Re: Powerbloc fl400
PostPosted: Thu Feb 08, 2018 4:15 pm 
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Joined: Thu Apr 29, 2010 12:53 am
Posts: 1430
Location: Norco, CA
I put a new one in last weekend and mine has the same issue, I'm using 10 weights, Engine is mostly stock, pipe and airbox mod.


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 Post subject: Re: Powerbloc fl400
PostPosted: Thu Feb 08, 2018 4:32 pm 
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Joined: Thu Apr 29, 2010 12:53 am
Posts: 1430
Location: Norco, CA
I just got off the phone with Neil, he said to check a couple of things, check to see if the belt on the driven clutch is below the top of the clutch, seems like it should be at the top, also put it in neutral and rev it out to see if it shifts all the way.


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 Post subject: Re: Powerbloc fl400
PostPosted: Thu Feb 08, 2018 5:10 pm 
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Joined: Mon Jan 26, 2015 10:11 am
Posts: 474
Same Engine had older powerbloc it did great but came loose thinking of using old parts and fixed sheave to see what happens. Wouldn't more weights be better? Just trying to figure this out. Could have sent instructions.


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 Post subject: Re: Powerbloc fl400
PostPosted: Thu Feb 08, 2018 5:25 pm 
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Joined: Mon Jan 26, 2015 10:11 am
Posts: 474
Did more research more is lower rpm less weight higher rpm gonna try 14-15 weights if they will fit


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 Post subject: Re: Powerbloc fl400
PostPosted: Thu Feb 08, 2018 5:31 pm 
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Joined: Mon Jan 26, 2015 10:11 am
Posts: 474
Checked old powerbloc had 13 weights in each puck. Gonna put 14 in new one tonight and try tommorow. Also gonna compare new spring to old spring


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 Post subject: Re: Powerbloc fl400
PostPosted: Thu Feb 08, 2018 7:30 pm 
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Joined: Sun Dec 24, 2006 5:58 pm
Posts: 2319
Location: near NJ rider
I was going to say, there are different springs also.


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 Post subject: Re: Powerbloc fl400
PostPosted: Fri Feb 09, 2018 2:25 am 
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Joined: Thu Aug 18, 2005 10:13 am
Posts: 3760
Location: PERTH WESTERN AUSTRALIA
Have you tried fully closing up the bloc manually,then sitting the belt into it to see the belt width/depth relative to full bloc closure?


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 Post subject: Re: Powerbloc fl400
PostPosted: Fri Feb 09, 2018 4:53 pm 
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Joined: Thu Apr 29, 2010 12:53 am
Posts: 1430
Location: Norco, CA
Good idea, I'll try that if running up in neutral doesn't work


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 Post subject: Re: Powerbloc fl400
PostPosted: Fri Feb 09, 2018 10:19 pm 
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Joined: Thu Aug 18, 2005 10:13 am
Posts: 3760
Location: PERTH WESTERN AUSTRALIA
Once you fully compress your Bloc then you'll have a baseline dimension.Where your belt sits will be at max.
You also need to measure your belt's width.The orig Pilot Mitsuboshi belt was at 30.4mm wide.
The aftermarket belts always seemed to be narrower.No big deal you say?
Well at 3mm service usage limit,1mm represents 1/3 of that limit.33% :shock:
It also will sit lower into the sheaves and mess with your gearing performance.
What is your belt width? I think from memory those Qual belts were 1mm narrower vs OEM?


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 Post subject: Re: Powerbloc fl400
PostPosted: Fri Feb 09, 2018 10:37 pm 
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Joined: Thu Aug 18, 2005 10:13 am
Posts: 3760
Location: PERTH WESTERN AUSTRALIA
Forgot to add,get yourself one of those lil Digital weight scales,like the dealers have. :-)
Measure your weight discs and put them in similar piles of weight.You won't believe how much they can differ by.
This anomaly in weight diff is compounded by their groupings if NOT matched together to end up with similar combined batch weights.
I would have 3 piles :shock: :-) lightest,mid and max.
Then try and mix and match them to end up with 3 same combine weights for your pucks.Also weight them Pucks too and weigh when all loaded.
If NOT then your going to end up with an ElvisClutch baby.Balance is paramount at high revs.
I posted up once some info about what a few grams outa balance do to the clutches relative to each increase in 1,000 revs.
It's a real eye opener seeing all those hundreds of pounds of side force on the clutch,crank etc all caused by a few measeley grams?
I'll see if I can search for that info.


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 Post subject: Re: Powerbloc fl400
PostPosted: Fri Feb 09, 2018 10:42 pm 
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Joined: Thu Aug 18, 2005 10:13 am
Posts: 3760
Location: PERTH WESTERN AUSTRALIA
Found it,and copy here.

viewtopic.php?f=1&t=16707&p=160915&hilit=clutch+balance+grams#p160915

Just found this info in my email system,was looking for it a while back,could never find it.
Not sure if I've already posted this info...not sure of a lot of stuff these days! :shock:
Anyway,it's affect is unbuggylievable.

WOULD YOU BELIEVE...?
That 7 grams of Unbalance at a 4" radius from center of a rotating element (Snowmobile Clutch) creates centrifugal forces of or equal to:

7 pounds at 2,000 R.P.M.
15.8 pounds at 3,000 R.P.M.
28 pounds at 4,000 R.P.M.
43.8 pounds at 5,000 R.P.M.
112 pounds at 8,000 R.P.M.
Top R.P.M. of an average Snowmobile


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 Post subject: Re: Powerbloc fl400
PostPosted: Fri Feb 09, 2018 11:18 pm 
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Joined: Sun Dec 24, 2006 5:58 pm
Posts: 2319
Location: near NJ rider
I was wondering when you'd get to the balancing part! :-)

Awesome post mate!


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 Post subject: Re: Powerbloc fl400
PostPosted: Sat Feb 10, 2018 11:38 pm 
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Joined: Thu Aug 18, 2005 10:13 am
Posts: 3760
Location: PERTH WESTERN AUSTRALIA
Thanks Bull...I was wondering when you would get to the acolade part mate? :-)

Here's another often overlooked tip,don't go caveman on those disc retainer white cap screw thingys like I used to.
They have a surprisingly light torque spec.
13-15 in/lbs,1.5-4 nm.
viewtopic.php?f=1&t=2646&hilit=powerbloc+elvis


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 Post subject: Re: Powerbloc fl400
PostPosted: Sun Feb 11, 2018 12:11 pm 
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Joined: Sun Dec 24, 2006 5:58 pm
Posts: 2319
Location: near NJ rider
"don't go caveman on those disc retainer white cap screw thingys"

More good info! Everyone you see is all chewed up from someone killing it with a screwdriver.


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 Post subject: Re: Powerbloc fl400
PostPosted: Sun Feb 11, 2018 2:30 pm 
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Joined: Mon Jan 26, 2015 10:11 am
Posts: 474
Compared springs old to new look exactly alike but old is approximately 1/4-3/8 inch shorter than new maybe just used anyways gonna try it soon as it days up a little 5" rain past 2 days.


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 Post subject: Re: Powerbloc fl400
PostPosted: Sun Feb 11, 2018 2:41 pm 
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Joined: Sun Dec 24, 2006 5:58 pm
Posts: 2319
Location: near NJ rider
Is there a paint mark on the spring? I think they were color coded for RPM.

The Aussie will know. :-)


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 Post subject: Re: Powerbloc fl400
PostPosted: Sun Feb 11, 2018 4:06 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
bullnerd wrote:
Is there a paint mark on the spring? I think they were color coded for RPM.

The Aussie will know. :-)


If you look close at this thread (or any other), some words are highlighted in blue. That means you can click on it and it will send you to an info page. When you type powerbloc it turns blue. The tech page has everything. Hoser must of set this site up that way. It was a good idea. Spring chart there.


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 Post subject: Re: Powerbloc fl400
PostPosted: Sun Feb 11, 2018 7:56 pm 
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Joined: Sun Dec 24, 2006 5:58 pm
Posts: 2319
Location: near NJ rider
canadian oddy wrote:
bullnerd wrote:
Is there a paint mark on the spring? I think they were color coded for RPM.

The Aussie will know. :-)


If you look close at this thread (or any other), some words are highlighted in blue. That means you can click on it and it will send you to an info page. When you type powerbloc it turns blue. The tech page has everything. Hoser must of set this site up that way. It was a good idea. Spring chart there.


Boom! When I said Aussie I meant CO! :-)


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 Post subject: Re: Powerbloc fl400
PostPosted: Sun Feb 11, 2018 9:58 pm 
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Joined: Thu Aug 18, 2005 10:13 am
Posts: 3760
Location: PERTH WESTERN AUSTRALIA
Here's some more info that might help you out.
There's a link there for the springs.
viewtopic.php?f=2&t=15163&p=145834&hilit=powerbloc+spring#p145834


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 Post subject: Re: Powerbloc fl400
PostPosted: Mon Feb 12, 2018 4:45 pm 
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Joined: Thu Apr 29, 2010 12:53 am
Posts: 1430
Location: Norco, CA
OK, so here's the latest, my old powerbloc has the same issue of not shifting to the top, that may be why it is worn out in the area 2/3 to 3/4 of the way up.
so I used the old one, took the spring out and compressed the sheaves together and the belt goes to the top. put the spring back in and compressed it all the way to make sure it was not going into coil bind, it was not. started the pilot, warmed it up put it into neutral and ran it up, man it seems like more than 7100 rpm but the belt goes to the top.
So, It seems the Engine doesn't have enough umph to rev high enough in the sand to get fully shifted, I think I either need a lighter weight spring or more weights to get it to shift further or a combination of both but would I then be giving up all the bottom end?


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 Post subject: Re: Powerbloc fl400
PostPosted: Mon Mar 12, 2018 7:02 pm 
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Joined: Mon Jan 26, 2015 10:11 am
Posts: 474
Ok some better results. Took spring off old powerbloc put in new. Also balanced weights and put in 15 discs. Haven't had for a ride but shifted out sitting here in neutral. Once drys up will road test!


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 Post subject: Re: Powerbloc fl400
PostPosted: Mon Mar 12, 2018 7:10 pm 
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Joined: Sun Dec 24, 2006 5:58 pm
Posts: 2319
Location: near NJ rider
What tire diameter are you guys running? Stock or larger?


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