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Old 12-05-2012, 10:27 AM   #1 (permalink)
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XC700 Bog out of the hole

Hi Folks, My first post, good to be here, lots of good info.

I have a 97 XC700 that I picked up last year. The top end was done including the pistons, rings and the usual, it has about 600 miles on it thanks to me.
I did not get allot of info on the sled other than that rebuild. It is in basically stock trim as far as carbs and pipe but I dont really know what has been done internally?

Problem I am having is that down low out of the hole or in slow trails there is hesitation and initially a very slow buildup of RPM when you gas it. Once up to about 5000-6000rpm and above the thing pulls like mad. The machine will do 100 mph. The throttle responce at 5 or 6K along the trail is great again it pulls hard.

The sled idles at about 3500 rpm and is right on the clutch, I was told it was setup for top end and not to touch it, haha OK buddy what have you got in this thing? could it be that it is jetted and timed for top end only? what can I do to get some low end back into my ride? I dont know enough about sled motors to know were to start, thanks in dvance.
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Old 12-05-2012, 12:30 PM   #2 (permalink)
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3500 is excessive for idle, it should be around 1800 - 2000 rpm.
He probably had is set that high because there was an issue with idle/stalling.
A thorough carb cleaning will usually solve that problem and then adjust the air and fuel screws to get a smooth idle.
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Old 12-05-2012, 12:56 PM   #3 (permalink)
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X2- That's where I'd start. Clean, synchronize, and adjust. suggested idol on my 700 arctic cat I had was 2500 RPM's
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Old 12-05-2012, 01:05 PM   #4 (permalink)
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Welcome to the Snow Show! X3 pay especial attention to pilot jets (upin the tube) I took a std straight screw driver and ground the edges untill it fit up the tube and that works best for the pilot jet! Take a 3" long piece of like 10 gauge stranded house wire and strip about half of it. Then fold down 1 strand of wire and use that to 'floss' the jets!
The next thing would be to get the motor square and center to centers right on the clutches. Then a new belt and adjust it as tight as possible!
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Old 12-05-2012, 01:13 PM   #5 (permalink)
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what i been using latly is a idea my freind gave me so bought a set for like 3dollars is the little wires at a welding shop that are to clean the tips of welding guns the smallest one in the kit works great u get like 10 little wires per kit they work good for cleaning tiny holes in carbs
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Old 01-02-2013, 09:24 AM   #6 (permalink)
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Thanks for all the replies, I think I found the problem the hard way. The mag side crank seal was blown out, this must have been causing a lean misfire. Any how after 2 pistons a jug, 2 heads and the new seal it has never ran better. Installed a single SLP pipe and can, right after that is when she melted down on the mag side, had 195/200 jets now 200/205, 45 pilot jet and it seems about right at our common minus 15-20 Deg C temperatures. Idles at 1700 ish now

Interesting how with the stock pipe and can and 185/185 jets 40 pilot the thing lived with the bad mag side seal as long as it did, put on the SLP single at it melted down one piston within 20 miles. Oh well experience is a tough teacher, first is the test then comes the lesson.

TJ
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Old 01-02-2013, 11:12 AM   #7 (permalink)
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I wouldn't blame the pipe and can for it. If that was going bad then it was in do time
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Old 01-02-2013, 02:24 PM   #8 (permalink)
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True, but the difference in jetting requirement just brought it to the fore.
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Old 01-02-2013, 04:10 PM   #9 (permalink)
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True, Most if not all after market pipes require to run specific size jets for their applications, should that be ignored of said directions then most likely engine failure will result.
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Old 01-02-2013, 08:29 PM   #10 (permalink)
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When I had a 97 RMK, I added SLP's Power Packs to the carbs. The 97 engine with the Keihin carbs is notorious for a low end stumble, I tried jetting and idle changes but those didnt' help much. The Power Packs worked well to eliminate the burble. FWIW

Polaris - SLP Power Pack

SLP's single pipe works really well, follow their clutching recommendations as well as jetting for best results.
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Old 01-03-2013, 10:14 PM   #11 (permalink)
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Quote:
Originally Posted by BC_Dan View Post
When I had a 97 RMK, I added SLP's Power Packs to the carbs. The 97 engine with the Keihin carbs is notorious for a low end stumble, I tried jetting and idle changes but those didnt' help much. The Power Packs worked well to eliminate the burble. FWIW

Polaris - SLP Power Pack

SLP's single pipe works really well, follow their clutching recommendations as well as jetting for best results.
Yep gonna focus on clutch too. I dont think the pipe all by itself caused the meltdown, its was coming no doubt, that is not what I am saying, it only moved the issue to the fore-front and sped along the inevitable. I learnt allot about my 700 lately, it sounds so fricken serious now with the new pipe and eveything sealed up, put some new skis on today and the thing will practically do donuts sorry there from a 2012 skidoo (bastardization)

Ya know that is the second time someone mentioned power packs, and ditching the boost bottle, I have the factory boost bottle, new carb rubbers drilled out to size. What is a good power pack for this motor?
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Old 01-03-2013, 10:41 PM   #12 (permalink)
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SLP's Power Packs are inserts that go in the Keihin carbs. They make the flow into the carb more laminar for better mixing at lower RPM. I don't know of anyone else that makes 'em. If you have the boost bottle, that is also something that has shown to help. I was unaware they made 'em for a 97, when I put a 2001 engine into my 97, I used the boost bottle and the power packs and my low end stumbles were gone.
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Old 01-04-2013, 06:51 AM   #13 (permalink)
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Originally Posted by BC_Dan View Post
SLP's Power Packs are inserts that go in the Keihin carbs. They make the flow into the carb more laminar for better mixing at lower RPM. I don't know of anyone else that makes 'em. If you have the boost bottle, that is also something that has shown to help. I was unaware they made 'em for a 97, when I put a 2001 engine into my 97, I used the boost bottle and the power packs and my low end stumbles were gone.
So the power packs can be used with the boost bottle? I thought it was one or the other.

Thanks for the info
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