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Started By
Message
ATV Losing torque *update* simple fix
Posted on 5/29/21 at 4:55 pm
Posted on 5/29/21 at 4:55 pm
2005 Big Bear 400. Everything stock. Engine runs great no smoke.
Today I notice it losing torque. Takes longer to get up to speed and struggles to pull out of a hole or spin out of mud. It doesn’t die it just doesn’t have the power.
What do the experts say.
Update,
The clutch adjustment nut was loose and turning freely. I had to turn the adjustment screw 3 full turns to get it to tension. Adjustment made. Nut put back to torque. Feels right on blacktop. True test will be it pulling against mud or something but I’m 90% it’s resolved.
Today I notice it losing torque. Takes longer to get up to speed and struggles to pull out of a hole or spin out of mud. It doesn’t die it just doesn’t have the power.
What do the experts say.
Update,
The clutch adjustment nut was loose and turning freely. I had to turn the adjustment screw 3 full turns to get it to tension. Adjustment made. Nut put back to torque. Feels right on blacktop. True test will be it pulling against mud or something but I’m 90% it’s resolved.
This post was edited on 5/31/21 at 9:28 am
8
Posted on 5/29/21 at 5:00 pm to Purple Spoon
brakes dragging? check compression.
Posted on 5/29/21 at 5:03 pm to auggie
Breaks are good. I have not checked compression
Posted on 5/29/21 at 5:04 pm to Purple Spoon
Carburetor or a vacuum leak are possible. Could be bad gas too.
Posted on 5/29/21 at 5:10 pm to Hog Zealot
Gas is fresh. What’s a vacuum leak?
Posted on 5/29/21 at 5:20 pm to Purple Spoon
Cracks in any of the rubber connections near or in your carb. A 15 year old piece of tubing or boot can get worn out. Throws off the air/fuel mix essentially.
Posted on 5/29/21 at 5:22 pm to Hog Zealot
I’m with you now. That makes sense. I’ll check that.
Posted on 5/29/21 at 5:22 pm to Purple Spoon
quote:
What’s a vacuum leak?
The engine creates vacuum. That's how it pulls fuel/air mixture into the combustion chamber. If you have a loose clamp between carb and engine, it wont pull fuel properly. there are also some small rubber lines that use vacuum to operate sensors or spark advance. Check the clamps and stuff for the air filter box too.
Posted on 5/29/21 at 8:41 pm to Purple Spoon
Change fuel filter if it has one.
I have a Honda Rincon that was doing the same thing. Started getting low on power and eventually got to the point where it wouldn’t run 5 mph.
I changed a bunch of parts and even bought a new Honda carb...turns out, Honda had some heat treat issues with the cam on the early models. Pulled the cam out and one of the lobes was worn slap out.
I have a Honda Rincon that was doing the same thing. Started getting low on power and eventually got to the point where it wouldn’t run 5 mph.
I changed a bunch of parts and even bought a new Honda carb...turns out, Honda had some heat treat issues with the cam on the early models. Pulled the cam out and one of the lobes was worn slap out.
Posted on 5/29/21 at 9:07 pm to Hog Zealot
quote:
Carburetor.
Posted on 5/30/21 at 6:49 am to Purple Spoon
Might want to check for a dirty air filter. Good luck and keep us posted on what you find.
Posted on 5/30/21 at 7:16 am to Purple Spoon
Start with air filter and carb. But if it seems to be running fine, I'd check clutch next. Out of adjustment or slipping plates.
Posted on 5/30/21 at 8:28 pm to bootlegger
quote:
I'd check clutch next. Out of adjustment or slipping plates.
I know my Honda automatic requires a certain engine oil that is also for the clutch packs in the transmission.
Wrong kind and they'll slip like a mother fricker.
OP, you have the right oil?
Posted on 5/30/21 at 8:42 pm to thejudge
Just got it home this evening. I have a checklist of stuff to check. I will bump this when I get it resolved. The more I rode the thing the more I’m thinking it has something to do with the clutches.
Posted on 5/31/21 at 6:13 am to Purple Spoon
Sounds more like a fuel (gas or air intake problem). Normally in neutral you can give it throttle and it winds up quickly like normal. When under a load is when you will see the problem... just like an outboard that runs great in the driveway.
Hard to believe the clutch has anything to do with a load/torque issue. It will be interesting to hear if you find anything related to clutches reducing torque.
Do yourself a favor and hit the fuel system first. Most likely this is the culprit. Speed sensors can cause all kinds of issues.
Hard to believe the clutch has anything to do with a load/torque issue. It will be interesting to hear if you find anything related to clutches reducing torque.
Do yourself a favor and hit the fuel system first. Most likely this is the culprit. Speed sensors can cause all kinds of issues.
Posted on 5/31/21 at 6:46 am to Purple Spoon
Try adjusting the clutches
Posted on 5/31/21 at 7:33 am to Purple Spoon
quote:
The more I rode the thing the more I’m thinking it has something to do with the clutches.
This is your best bet. An easy first step is changing the oil, could be as simple as the clutch slipping. Has it been through high water recently? If it was a fuel/air issue it would sound terrible in the throttle range where it had the issue, popping and wanting to die out. Clutch issues are exactly as you describe, the engine turns but it doesn’t translate to power.
Posted on 5/31/21 at 7:52 am to Purple Spoon
If it's the clutch slipping, it will rev really fast in gear, but the revs won't be transferring to the wheels. Is that how it's acting? Or is it taking longer to gain revs?
Posted on 5/31/21 at 10:39 am to Purple Spoon
quote:
The clutch adjustment nut was loose and turning freely. I had to turn the adjustment screw 3 full turns to get it to tension. Adjustment made. Nut put back to torque
What are you calling the clutch adjustment nut? Sounds like something I might need to check as I have the 350 engine, same as yours just with a different head.
Posted on 5/31/21 at 11:23 am to TheDrunkenTigah
On my Yamaha there is a nut with an adjustment screw sticking out close to the foot shift.
You have to loosen the nut on the adjustment screw then turn it counter clockwise until it reaches tension then back it off slightly. Then tighten the nut back up.
When I went to check mine the nut was almost off and the adjustment screw was way out of tension.
You have to loosen the nut on the adjustment screw then turn it counter clockwise until it reaches tension then back it off slightly. Then tighten the nut back up.
When I went to check mine the nut was almost off and the adjustment screw was way out of tension.
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