98 xc 700 timing? bog!! - Snowmobile World : Your #1 Snowmobile Forum
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post #1 of 16 (permalink) Old 02-13-2011, 01:08 PM Thread Starter
TSF
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98 xc 700 timing? bog!!

iv got a 98 xc 700 that i put mikuni carbs on and i have this anoying bog, it pulls realy strong all the way from stop to wot(7800rpm) with no issues but if im wot and back off to half throttle and then punch it again it bogs realy bad, if i slow way down and start again its GONE! its got a new motor, new fuel pump, new fuel lines, new fuel, clutches look good, tried new cdi box, new plugs, iv done everything except check the timing, could timing cause this if its out?? iv played with the jetting and needle positions and i think thats pretty close every jet size and needle position has that same bog! if it could be timing does anyone no the specs?? thanx
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post #2 of 16 (permalink) Old 02-14-2011, 05:51 PM
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Sounds to me is the secandary clutch issue. What helix, and spring are you using? WL

'16 Polaris RUSH 800HO
'06 Polaris Fusion 600HO (traded her in)
'05 Polaris Sportsman 400 4x4
'01 Polaris XCR-800 (VF2, clutched, dynoport and cut heads)
'00 Polaris XCR800 (VF2, dynoport pipes, HTG billetheads, clutched)
'99 Polaris XCR800 (shimkit with stock pipes)
'98 XC700 (reprogrammed CDI, powerpak, boost bottle, clutched - 824 version)
'98 XC700 (clutched, VF - 220 version)
'95 XCR600 (PSI heads, pipes and clutched)
'94 Indy Trail
'89 Indy 500 (PSI single pipes - clutched)
'88 Indy 400 (owned twice)
'88 Indy Sprint
'88 Indy Sport
'79 Ski Doo Olympic 340
'79 Ski Doo Citation 300
'78 Polaris TX440
(and many more)
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post #3 of 16 (permalink) Old 02-14-2011, 07:20 PM Thread Starter
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primery is dark blue with 62 weights and secondary is stock helix (i think) with a grey spring
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post #4 of 16 (permalink) Old 02-15-2011, 12:43 PM
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I used to have two '98 XC7s - one of them I bought brand new. I do believe stock is dark blue, 60g - straight 36 and silver. I changed the clutching set up to 62g, EPI red, R12 helix, with POO Silver/blue. Thats for 824 version engine in the '98. In my 220 version in my other '98, I had the setup a little differently. Couple qq's, what hole setting is the helix on? And also what belt are u using? WL

'16 Polaris RUSH 800HO
'06 Polaris Fusion 600HO (traded her in)
'05 Polaris Sportsman 400 4x4
'01 Polaris XCR-800 (VF2, clutched, dynoport and cut heads)
'00 Polaris XCR800 (VF2, dynoport pipes, HTG billetheads, clutched)
'99 Polaris XCR800 (shimkit with stock pipes)
'98 XC700 (reprogrammed CDI, powerpak, boost bottle, clutched - 824 version)
'98 XC700 (clutched, VF - 220 version)
'95 XCR600 (PSI heads, pipes and clutched)
'94 Indy Trail
'89 Indy 500 (PSI single pipes - clutched)
'88 Indy 400 (owned twice)
'88 Indy Sprint
'88 Indy Sport
'79 Ski Doo Olympic 340
'79 Ski Doo Citation 300
'78 Polaris TX440
(and many more)
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post #5 of 16 (permalink) Old 02-15-2011, 01:03 PM
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Most likely not a timing issue, that would produce a constant bog. If not, it wouldn't change based on how much throttle you gave it.

I love the smell of 2-stroke in the morning
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post #6 of 16 (permalink) Old 02-15-2011, 09:48 PM Thread Starter
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the spring is in #2 hole and im using a polaris belt number ending in 65,, (tried a brand new one today with no diff) and it is the 824 version of cylinders. also checked the timing and its at around 4 at 1500 rpm and 13 at 8000,, but it seemed like my light was flickering a little more around 6000 rpm vs 8000 or 3000... maybe thats normal??? could it be my stater getting weak or somthing? i got a spare one i could try... i need all the options i can get!!!!
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post #7 of 16 (permalink) Old 02-16-2011, 11:28 AM
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Light flickering? make sure all your connections are intact and that everything is all it should be. I dont think the stator goes bad in them but you'd never know. If you have a spare, try it and see what happens. Let us know. 824 version should run at 8k for peak revs. WL

'16 Polaris RUSH 800HO
'06 Polaris Fusion 600HO (traded her in)
'05 Polaris Sportsman 400 4x4
'01 Polaris XCR-800 (VF2, clutched, dynoport and cut heads)
'00 Polaris XCR800 (VF2, dynoport pipes, HTG billetheads, clutched)
'99 Polaris XCR800 (shimkit with stock pipes)
'98 XC700 (reprogrammed CDI, powerpak, boost bottle, clutched - 824 version)
'98 XC700 (clutched, VF - 220 version)
'95 XCR600 (PSI heads, pipes and clutched)
'94 Indy Trail
'89 Indy 500 (PSI single pipes - clutched)
'88 Indy 400 (owned twice)
'88 Indy Sprint
'88 Indy Sport
'79 Ski Doo Olympic 340
'79 Ski Doo Citation 300
'78 Polaris TX440
(and many more)
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post #8 of 16 (permalink) Old 02-16-2011, 06:30 PM Thread Starter
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ya it seems like the light is as steady at 6000 vs 8000 or 3000 and thats right were my bog is,,, im gonna try swaping stators and see what happens
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post #9 of 16 (permalink) Old 02-16-2011, 06:34 PM Thread Starter
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i mean not as steady!!
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post #10 of 16 (permalink) Old 02-17-2011, 07:09 PM Thread Starter
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changed the stator today and no difference!!!!
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