Quantcast
Jump to content

Yamaha 350 4x4 Big Bear clutch issues or ???

Bruce Sawyer

By Bruce Sawyer
in Yamaha ATV Forum

 Share

Recommended Posts

Bruce Sawyer Rookie

Bruce Sawyer

Posted
Posted

1987 YFM350FWTB 350 4x4 Big Bear when going uphill will sometimes act like the clutch realeases then re-engauge all at once.

Seems to maybe be little more often if the engine is at about 1/2 throttle instead of at lower rpms.

I have the Factory service manual and checked the external clutch adjustment screw as ok and the H/L/reverse shifter lever linkage as adjusted correctly. It appears to be maybe a internal (inside the case) clutch issue or ??

This is the type Big Bear that has the manual shift lever on the left front fender and has the manual foot shifter lever with 5 speeds forward.

Can someone tell me how the primary and secondary clutch operates? 

I assume one is mechanical and one is centrifugal. (what I'm asking is one clutch for the higher rpms and one for the lower rpms or ???. (the clutch appears to only momentarily release at the higher rpms is why I ask. The cycle has about 3000 miles of low speed through the brush hunting and has been well maintained, oil changed, etc and no deep water or mud useage.

Anyone been into a similar issue with the big Bear ATV????

Bruce Sawyer Rookie

Bruce Sawyer

Posted
  • Author
Posted

Original poster: Forest Gump.

 

I determined that I had been using the wrong oil in this ATV Yamaha machine for quite some time.

I should have been using a 10-40 ATV cycle oil for wet clutches. I was using regular automotive oil.

Automotive oil is slicker and will cause the secondary clutches (also termed transfer clutches) to slip.

 

ajmboy: If I were you I would change the oil to make sure it's the proper type and if that don't correct the issue you are probably going to have to checked you transfer clutches (secondary clutches) to see if they are burned and need replaced.

 

I'm not getting email notices in my mailbox even though I'm subbed????

 

  • 4 weeks later...
Bruce Sawyer Rookie

Bruce Sawyer

Posted
  • Author
Posted

I changed the oil to the correct type. ATV 4 cycle motorcycle 10/40 from Napa.

The Big Bear has been operating ok now with no clutch jerking.

I seen this you tube video for a Yamaha Big Bear about how to inspect/change out the clutches that will be very helpful to anyone going into the clutch area. The service manual will be good to use in addition to this video. You may have to C/P this link into internet explorer for viewing?

https://www.bing.com/videos/search?q=How+to+replace+the+clutches+on+a+Yamaha+Big+Bear%2c+video&docid=608041014883389422&mid=F1B989DC120398A44A80F1B989DC120398A44A80&view=detail&FORM=VIREHT

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

    • Atomusthenes
      88 Honda four trax 300 4x4
      By Atomusthenes
      I would appreciate being pointing in the correct direction for a wiring diagram and or schematics of the 88 Honda FourTrax 300 4x4 if anybody has any knowledge of how to test the ignition system stator and CDI I don't know if the voltage regulator probably and also the FCU I put a new ignition in it it is a cheap aftermarket one doesn't have the correct plugs but has the correct wiring scheme I get power  the neutral light comes on and the oil light stays on it turns over but I have no spark
    • RadRob
      Hello to all.
      By RadRob
      I am new to this site. I have a 1987 Suzuki LT230S Quadsport I think. Is there a difference between quadsport and quadrunner?
    • Coyote251
      2008 Brute Force 650, clutch is slow to engage
      By Coyote251
      I'm trying to help a buddy out with his bike (he's not really on the internet or familiar with these forums) and I'll admit that I am not super familiar with the transmission and clutches in these bikes. I owned a Brute a few years ago, but never had an issue like this that I had to troubleshoot.
      So basically my buddy bought a group lot of 650's to build one good bike out of. He got it all put together and has it running but when he pushes on the throttle the clutch doesn't engage till the RPM's are quite high and even when its moving it doesn't really speed up, almost seems like its in "limp mode". He's tried 2 different transmissions so I don't think that's the problem. 
      Is there any adjustment on the clutch engagement? Anything else I can tell him to look at? Let me know if you need anymore information if you think you can help.  
    • Tim Keiper
      2 problems with 2000 Timberwolf 4x4
      By Tim Keiper
      1st problem, Does anyone know where I can find a stock carb for my Timberwolf, I have tried two different aftermarket carbs and they both suck. The machine runs great until it gets good and warm, then it keeps stalling unless I feather the throttle. it will even stall while I'm trying to go from 1st to reverse or vise versa. I took it to a buddy of mine who is a bike mechanic for years, and he told me try to find a factory carb. When I look online from dealers it says "NOT AVAILABLE" anyone have any suggestions ?
       
      2nd, The small tab on the rear axle for towing is to short for even pulling my small yard trailer, I can't even turn a little bit and hit hits. I tried making an extension which worked great as far as length, but it bends the tab and then the extension drags the ground. I have an idea of what to do to fix it, but wanted to see if anyone else has had this problem and see how you solved it.
    • Thumpinhard25
      01 bear tracker stutter/ bog, electrical ??
      By Thumpinhard25
      First thanks for any help guys, new to the forums and it's gotten me this far. I bought a 2001 bear tracker 250 for my family to get around the dirt bikes races. It wasn't running right and had a high idle. Previous owner thought it was a carb problem, so he ordered a new Zoom carb and new intake boot, but it still had the same high idle. ( I believe he had the throttle cable adjusted wrong, because it idled fine when I put it back together) So I tore down and cleaned the stock carb, and it started up and idled fine, but needed to have the choke 1/2 out to run.  I swapped to the new zoom carb and had the same issue. Choke half out bike ran ok. I played with the needle and the pilot screw with no change. ( bike did seem to be running rich though, but didn't get better when I tightened pilot screw or raised meddle) I Took it to the races and once I started bouncing around in the cattle fields the quad started cutting out real bad. It would barely run.  Sometimes it would run with choke off, sometimes choke 1/2, sometime choke full. I cleaned carb again, checked float level, and boots, no change still wouldn't run. Then suddenly it started running ok again.  This makes me believe it's an electrical issue rather then carb. I know there's no air leak, it's been checked, both carbs are clean( I've swapped them out a couple times, it starts up immediately and usually idles fine. But then bogs down/ or stutters under throttle. I saw the post on the guy who disconnected his rectifier and reconnected and suddenly it started working again, which lead me to believe it may be electrical and not carb.  So any advice on what I should check? Any way to test the CDI or rectifier?  Once again, I appreciate your help.  

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...