2006 Prowler 650 H1 Engine problems - Arctic Cat Prowler Forums: Prowler UTV Forum
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post #1 of 15 (permalink) Old 06-23-2018, 08:29 PM Thread Starter
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2006 Prowler 650 H1 Engine problems

Hello all, I recently bought a prowler 650, and soon after took it on a long ride. Went over lots of quad trails etc. Anyway, on the way home, I was on an open gravel road running at 6000 rpm (I know I shouldn't have lol), when the engine suddenly started making a very loud rattling noise. I pulled over and stopped, and the engine quickly died. Anyway, I tried to start it right away, and the motor barely turned over once, did that several times, then it turned over and fired up. Ran fine but continued making a super loud rattling noise.
So, I towed it home, and have since been trying to figure out what is wrong with it. I can't seem to tell for certain where exactly the noise is coming from, but I have confirmed that it is not the clutch, and my valves are within spec. I have good compression, but I noticed that my oil is quite low. In fact I just put a quart in and it is now about the right level. I also took the intake off, and can see that at least the intake valves are not bent.
If it somehow relates, since I got it, it has had a knarly backfire upon decceleration, which I believe to be because there doesn't seem to be an exhaust gasket. Just thought I'd throw that out there.
BTW, the noise sometimes goes away while idling, but under any throttle it is always painfully loud.
I'm guessing the problem resulted from a combination of too many rpms and low oil, so if anyone can tell me what is likely to be the culprit, or if I'm completely sunk that would be greatly appreciated. Thanks so much!
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post #2 of 15 (permalink) Old 06-24-2018, 05:46 AM
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Welcome to the forum! These things do rattle a lot, most of the noise is the clutch rollers at rest, they have just enough room to vibrate creating noise. As to your motor, drain the oil, check for any metal. If you have good compression chances are the top end is good. Pull the rocker arm cover and see if it had good lubrication. The bottom end on these are splash fed, so low oil may have been your issue. I'd recommend a good wet clutch compatible synthetic 10/40, or 20/50 oil. There is a sump at the bottom of the motor held on with 4 torx bolts, any broken parts usually end it here, plus it is recommended you clean the screen every 6 months or so. Download a free service manual at K&T Lawn Equipment, or Country Cat.

2009 700EFI XTX, , AC Winch, 2010 Dust Shield EPI Sport Utility Clutch Kit , Street Legal, Cage chopped 2 ", Aluminum Diamond Plate Trim, Relocated Factory Bladders with covers, 5 Pt. Harness installed, Bed Tiedown System, Scat Pro-Car Seats, Secondary Battery installed, Oil Pressure, Oil/CVT Temperature, Volt Meter & Water Temp Gauges installed with Dash Plate, Bighorns, ITP Black 212 Wheels. Tonneau cover. 750 Big Bore Kit, Web Cam, and Rocker Arms.

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post #3 of 15 (permalink) Old 06-24-2018, 08:49 AM Thread Starter
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Originally Posted by Fairmont79 View Post
Welcome to the forum! These things do rattle a lot, most of the noise is the clutch rollers at rest, they have just enough room to vibrate creating noise. As to your motor, drain the oil, check for any metal. If you have good compression chances are the top end is good. Pull the rocker arm cover and see if it had good lubrication. The bottom end on these are splash fed, so low oil may have been your issue. I'd recommend a good wet clutch compatible synthetic 10/40, or 20/50 oil. There is a sump at the bottom of the motor held on with 4 torx bolts, any broken parts usually end it here, plus it is recommended you clean the screen every 6 months or so. Download a free service manual at K&T Lawn Equipment, or Country Cat.
Hey there and thanks for the reply! I am fairly positive that this noise is unnatural and not supposed to be happening. It started very suddenly and is extremely loud. I did take the rocker cover off and everything seemed to be in good shape. timing chain was not loose, valves seemed fine, only thing was the cam lobes seemed kinda worn. So I need to drain the oil, the pop the sump off and look for any metal shavings or broken parts, then go from there? Thanks again
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post #4 of 15 (permalink) Old 06-24-2018, 09:49 AM
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Could the one-way bearing make that kind of noise? If your rockers and cam are looking worn you might try to check your oil pressure to make sure you're getting enough on the top end, but that could be from being a quart low. I'm not sure about the '06 but the '07's oil pump driven gear were prone to failure, the teeth would break off the gear (it happen to me) and cook the top end. Bevel gear maybe? They updated those also. Just throwing a few thoughts out there.

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post #5 of 15 (permalink) Old 06-24-2018, 10:37 AM
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Oneway is a possibility! I forgot all about that! When mine let go, it was sudden! One big bang, then complete silence except for mama and her WTF? LOL
My piston broke at the pin on one side, bent the rod, and smacked the head! Piston was up out of the bore on one side! Stock parts going back in it except for the exhaust system!

2009 700EFI XTX, , AC Winch, 2010 Dust Shield EPI Sport Utility Clutch Kit , Street Legal, Cage chopped 2 ", Aluminum Diamond Plate Trim, Relocated Factory Bladders with covers, 5 Pt. Harness installed, Bed Tiedown System, Scat Pro-Car Seats, Secondary Battery installed, Oil Pressure, Oil/CVT Temperature, Volt Meter & Water Temp Gauges installed with Dash Plate, Bighorns, ITP Black 212 Wheels. Tonneau cover. 750 Big Bore Kit, Web Cam, and Rocker Arms.

Either - Dick or RD
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post #6 of 15 (permalink) Old 06-24-2018, 11:16 AM Thread Starter
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Thanks for the replies all! So I'm plannning on going to change my oil today, probably pretty soon. As to after that, what is a good action plan? I'm understanding that my problem is due to a lack of lubrication, but what is likely to need replaced? do I need to pull the engine? How do I confirm if the oil pump is shot?
Thanks so much!
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post #7 of 15 (permalink) Old 06-24-2018, 01:11 PM Thread Starter
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Alright, so I drained the oil, and was surprised at how little came out despite filling it up all the way yesterday. I have been struggling for the last hour trying to get two of the torx screws out that hold the little sump thing in. two of them came out easy, but the other two are directly above a frame crossmember and have very limited access. any tips?
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post #8 of 15 (permalink) Old 06-24-2018, 01:20 PM
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That is a pain, I used a 1/4" wrench with the bit.

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'07 Prowler 650 H1 XT, L.E.D. stop/turn signals, Summit Racing heater, AC winch, AC windshield, soft cab & doors, 6' Eagle Plow, oil gauge, Maxxis MT-762 truck tires, AC Fender Flares, E-Brake alarm, Yutrax UTV Jump Seat, Dynatek CDI
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post #9 of 15 (permalink) Old 06-24-2018, 01:46 PM Thread Starter
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That is a pain, I used a 1/4" wrench with the bit.

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I tried that, but despite using a screwdriver to push the bit up into the screw, it stripped one of the star heads. they seem to be far tighter than the other two, I guess maybe someone went to take it off but gave up when the came to these guys... just a random guess Is it imperative that I get the sump off? I didn't see any metal shavings in my oil, but I suppose those would be in the screen anyway.

Also I had a thought... I've been hearing that the first thing to go due to low oil is the camshaft/valvetrain. Seeing as my cam lobes seem kind of worn, is it plausible that the noise is entirely because of the worn lobes? or do I probably have a deeper problem as well?
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post #10 of 15 (permalink) Old 06-24-2018, 02:07 PM Thread Starter
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Quote:
Originally Posted by Fairmont79 View Post
Welcome to the forum! These things do rattle a lot, most of the noise is the clutch rollers at rest, they have just enough room to vibrate creating noise. As to your motor, drain the oil, check for any metal. If you have good compression chances are the top end is good. Pull the rocker arm cover and see if it had good lubrication. The bottom end on these are splash fed, so low oil may have been your issue. I'd recommend a good wet clutch compatible synthetic 10/40, or 20/50 oil. There is a sump at the bottom of the motor held on with 4 torx bolts, any broken parts usually end it here, plus it is recommended you clean the screen every 6 months or so. Download a free service manual at K&T Lawn Equipment, or Country Cat.
Is there something I can do to discover for sure what exactly is wrong with it? anything that should be disassembled? If the one way bearing is the problem how can I confirm that? I really appreciate your help. Thanks so much
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