Quantcast
Jump to content


1995 Polaris Magnum 425 Bog

Twisted_Toyz

By Twisted_Toyz
in Polaris ATV Forum

 Share

Recommended Posts

Twisted_Toyz Newbie

Twisted_Toyz

Posted
Posted (edited)

Help! I'm stumped, We have a 1995 Polaris Magnum 425 4x4 in our shop. The customer's complaint was when it warmed up it bogged badly, he said he would stop shift the bike into nuetral and rev it up a bunch of black smoke would come out and then it would run fine for a short while then he would have to repeat the same proceedure again. Now don't get too excited I'm fairly sharp with mechanics. First I started the bike and ran it around the yard for a good ten to fifteen minutes the bike seemed somewhat sluggish and non-responsive running extremely poor and backfiring a bit. Next I removed the air filter, no improvement, I left it out and removed the exh. springs and seperated the exh at the cylinder head, loud but no inprovement so a hooked it back up, next I removed the carb for the second time and throughly cleaned it, it's perfectly clean the needle and seat are the best I've seen the jet needle in the slide is locked propperly by the spring and the diaphram's perfect. I hooked up the carb to a gravity fed tank to bypass the fuel pump and still bike idles perfectly but when you throttle up it starts to stutter, I'm aware of the rev limiter and it does act any differently when the button is depressd I opened the throttle bay and the limiter switch is 100% operational. HERE'S THE KICKER with airbox completely removed from the carb the bike throttles up perfectly, BUT as soon as you hook it back up it won't rev. this is with the airfilter out completely vacant box ABSOLUTELY NO RESTRICTION GAURENTEED, AND NO IT'S NOT COLAPSING UPON ACCELERATION. You can literally rev the bike with the air box sitting 1/2" off the intake throat on the carb and while your revving it slide the airbox intake tube on the carb and it falls flat on it's face, and I mentioned THERE ARE NO OBSTRUCTIONS IN THIS TUBE. P.S. I pulled the valve cove and set the tappets to .006" according to service manual, they were almost perfect, i would say I may have increased the tappet clearance if anything by a thou or two.

PLEASE HELP I LOOSING SLEEP!!!:aargh:

Edited by Twisted_Toyz
Link to comment
Share on other sites
  • 6 years later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Similar Forum Topics

    • HSTAR
      1997 Yamaha big bear 350 Shift shaft issue
      By HSTAR
      Hey I have a 1997 big bear 350 4x4
      I replaced the shifter shaft and the shift arm linkage and the rod when I installed them all I was unaware that you had to line the dot on the shifter shaft with the gap on the linkage arm gap put it all back  together and rode it I can't get it to shift in the right gears  I can move the shift cam by hand and goes in different gears but with the shifter shaft in it riding I can't put it in R or N 
      Anyone know how to line up the shifter shaft and the shift cam s
       
    • BruceG
      2005 Bruin 350cc Oil pumping into airbox
      By BruceG
      Hi guys. I have a problem where the quad will start and run well for about 5 minutes and then it dies. On inspection the airbox has oil in it (quite a lot). The oil is pumping through the cylinder head breather hose. This problem first happened suddenly. I have since done the top end including, piston, gaskets, rings and valves. I have also done the carb (not that I thought that this was the problem). The compression seems normal. The only thing that I can think of, is that I did not grind the valves well enough. Anyone experienced this? If so, how did you fix it? Any other thoughts?
    • Mhatayas
      Baja 250, No Spark , I'm stumped ...
      By Mhatayas
      My uncle bought a Baja 250, 2006. Knew there was no spark since the get go. He don't know anything about quads so is getting me to help him try to get it running...
       
      battery is bad so I connected battery charger to it to crank it over , cranks over well , but no spark .... 
      Lights and everything work fine , but with each crank over using the e start switch , the display reads 999 888 777 666 ... Right down to 000 and repeats itself . 
       
      He managed to get a parts bike , I changed over the CDI and the coil and the stator from the parts bike and there was another black box by the voltage regulator I changed over ... I used my multimeter to confirm as much as I could works , it's hard without knowing which wires are which , and I cannot find any diagrams online for this bike ? 
       
      Do you think it could be the Killswitch? There's so many wires coming from there I don't know where to start . Also I should mention it appears the fan on the front of the bike has been taken off (the wires have been cut too ) 
       
      If this bike sparked it would run . The previous owner said he parked it one day and it just wouldn't start after.
    • McG75
      1996 Yamaha Timberwolf 4x4 Struts and Shocks
      By McG75
      Hello I’m new here and was wondering is anyone knew of good replacement part numbers for front struts and rear shocks for this atv? I think I’ve found a new rear shock, that looks like the original but there is no dimensions or anything and was wondering if there are any afterMarket new front struts available. I know it’s a long shot but any help would be appreciated. 
    • McG75
      1996 Yamaha Timberwolf 4x4 Rear End Width
      By McG75
      1996 4x4 Timberwolf rearend width. Can someone with some knowledge of these machines answer this question for me please. Are all 4x4 timberwolves this narrow in the rearend? These tires are so close the right one actually rubs the muffler.  Thinking about seeing if there are any spacers out there for it. I need at least an inch more clearance. 
      .
       
       

COMMUNITY SECTIONS

ATV FORUMS

QUADCRAZY MEMBERSHIP

Be a part of best online community of ATV riders and join thousands of people who love ATVs! Share your ATV photos, videos, ATV rides, get help with your ATV and more. Not a member?

SIGN UP TODAY

ADVERTISE WITH US

FOLLOW US ON

  • Automotive Webmaster
×
×
  • Create New...