Has anyone play around with the secondary spring on the 650 ac.
I was thinking about changeing the secondary spring and going with the black spring
just wondering if it would help any.

 

Try posting in the kawi section, they should be able to help you out.

 

the black secondary spring is a must for for the kawi, but I heard that AC had a different clutch set up.

 

It has the same clutch.

I did the black spring, and the belt seems to grab better.

 

Yes, the black spring will help. Also you might need to remove a shim. Belt spec is 22 - 27mm. This is very easy to do.

 

Yes do the black spring and remove the shimor shims, for belt life only, if you dont it will start to make a squak noise when you take off after a few good mud boggs. Mine did till i did the black spring never had a problem since. but you will find that when you are at idle with it in gear the belt will start to wine a bit ,just put it in nuetral every time you stop. and once your belt breaks in to the new adjustment it wont do it anymore. just my .02 [img]i/expressions/face-icon-small-smile.gif[/img]

 

I had 2 Prairie 650s, 1 a '02 & a '03. The Clutch on the Cat 650 is the same updated clutch on the '03 Prairie 650.
Do put in the EPI Black spring.(Erlandson Performance)
If you remove both shims, belt will be really tight but will be noisy in gear at idle or driving real slow in low range. I have found it best to leave 1 shim in & on my Prairies it was the .06 shim. I believe I read that the Cat 650 is using 2 same size shims & that the Cat 650 is using the updated Prairie 700 belt, which does require different shimming than what the Prairie 650s came with.
Between the Black Spring & removing at least one Shim & if you remember to use low range at speeds of below 20 mph with the 4x4 mode, you will get a lot of miles out of your belt. I have seen Prairie 650's with 2700 miles on the Stock Belt with these mods and riding habits.

 

bfb650BEARCAT:

How do you like the AC650 versus the P650? I'm really impressed with the power. Between the AC650 and the 660 Grizzley, the 650 has a lot more bottom end torque. They have about the same HP at the high end, but the Grizzley ramps up slower.

FYI:

I found with the intake if you remove the OEM snorkle, and replace it with 2" ABS pipe fittings, you can make a retro-fit really cheap. You need a 90 degree and a 45 degree and a little black tape (so the 90 degree fits snuggly onto the airbox). You'll need to rejet, as the AC650 comes with Kawie 122 jets (at least mine did, front and rear). The P650 came with 138/142 Kawie jets (21% richer!). Makes a HUUUUGGGGEEE difference on power.

 

WIRES
I am still waiting on my Cat 650 & have been since October. It is suppose to be in by the 12 of December but I have heard that before. This Dealer has not recieved one of his 650s yet & all 5 he has on order have been Sold, now if they will just get them shipped to my dealer, as they are now made, just waiting for shipping.
I heard the jetting is not good on the Cats, I had my Prairie 650 jetted at 132F/138R for the altitudes I ride at, 6500 - 13000 Ft. The P650 with a DG Snorkel ran great with those jets.
Not sure about the Cat, being it has 122 size jets. Hopefully the dealer will have a idea on what size of jets I need to change to for my elevations.
As far as a Snorkel goes, I will be testing a DG Snorkel as a tester, so as soon as DG has one ready for me, I'll be putting it in.
I also have my DG Holeshot that I took out of my P650, that too will be going into the Cat 650, DG already sent me Detailed instructions on how to wire it up in to the Cat 650.
As soon as I get my Cat 650, I'll post on my findings between the Cat vs the P650. My riding buddy is going from a Grizz 660 to the Cat 650 too, it will be interesting to see how we both compared our Cats to our Kawie & Yamaha.

 

bfb650BEARCAT,

Ok... I'm eager to see what you think of it. I love the ground clearance and IRS. The power is awesome, but I don't need to tell you that!

I'd do the snorkle mod and re-jet ASAP. BTW, the inlet on the airbox is big enough to supply all the air the bike needs, it's just the snorkle goes from 2" in to 1 5/8" out (it's a rubber restriction molded in). That isn't enough for the twin 32mm carbs.

Oh yeh, as soon as you get it, check the tire pressure. AC and Goodyear say 5 PSI for those MTR's, but I found that when turning, the bike rolled onto the sidewalls and slid until the rims dug into the ground (slow speed or fast speed). I have some really beat up chrome rims to prove it. I upped the pressure to 8 PSI, and it seems much better, but the last time I was out there was 6" of snow, so I couldn't get really good traction to test it. The tires have awesome traction in mud, snow, slopes (not as good as gators, 589's, etc) but still really respectable for stock tires (other than the soft sidewalls).

Here's what I think of the 650 Cat versus the 660 Grizzley:

Cat:
1) More low end power. You crack the throttle and the front end goes light as the bike forces you back on the seat. They have about the same high end power, but way more snap down low.
2) Better ground clearnace.
3) Heavy steering. Great for trails, not great in heavily tree'd areas. Mind you, with 1) above, you wouldn't want it too nimble.
4) Less engine vibration, quieter exhaust.
5) More compliant suspension. More forgiving when hitting dips at a high attach angle.

Grizzley:
1) More nimble. You can manouver around anything. With the cat, you need to use reverse once in a while. Downfall is that deficiencies in the trail are transmitted more easily to the handlebars, which gives you a nasty upper body workout.
2) That single thumper is nasty for vibration and noise. With the cat muffler drilled and modified (the Nyroc way), the cat is about as loud as a stock grizzley!
3) A little harsher ride.

All in all, I think they are evenly matched. I like the cat better because of the smooth engine, with more power. But the grizzley is more nimble.