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2000 Yamaha Big Bear 400 4x4 shifting question

mga

By mga
in Yamaha ATV Forum

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mga

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Finally got it together and running, but shifting seems a bit hard, especially if you have sneaks on. Are they normally that hard to shift?

Also, when i releaase the throttle to shift into another gear, it doesn't seem to lose RPM's fast....it seems to take it's time. I put a new throttle spring in about a week ago and the lever does back off, it's just doesn't seem to die down as fast as it should. I've got the idle down as low as i could get it before it would quit. Other than that it runs good.

There's an aftermarket carb on it, so maybe the issue lies there?

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mga

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9 hours ago, Jim Denton said:

It's a cv type carb maybe check if the slide and its bore are smooth? Being vacuum operated it might be hanging up on the way back down. If the shifter uses a cable try and lube it?

i had to add a new "choke" cable, maybe i need to adjust it better.  i'll try that today.

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mga Collaborator

mga

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22 hours ago, Jim Denton said:

Seems to me that if that plunger is sticking it'd be running rich.

checked that out, seems to be sliding nice, but i found the throttle cable was hooked to the side frame, making an small bend shape to it. I removed it and kept it straight and it seems to be great now. It's those little unseen things that can give you a pain.

Thanks for helping!!

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Gwbarm Grand Master

Gwbarm

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Yours was an easy fix, I had a yamaha doing that once and I had to take the slide out and polish it smooth to get it to slide easier still wasn't perfect I came to the conclusion that the spring wasn't strong enough for it to return, causing the idle to stay high after releasing the throttle.

Jim Denton Community Regular

Jim Denton

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Glad you found it. Since you know your way around check out the Sigma Six kit. I did a similar kit to a Mikuni on a Evo I had. Woke it right up. I also had stright shots on it so it breathed well. And an Andrew's EV-27 cam. This kit  will be going on the one I'm building now, along with a 250S cam thanks to a trade with one of our cadre.  Both cams are the same as to almost doubling the duration but same lift. I wantnto see it running first as is.

 

https://www.6sigmajetkit.com/suzuki-lt-f-300-king-quad-jet-kit.html

mga Collaborator

mga

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3 hours ago, Jim Denton said:

Glad you found it. Since you know your way around check out the Sigma Six kit. I did a similar kit to a Mikuni on a Evo I had. Woke it right up. I also had stright shots on it so it breathed well. And an Andrew's EV-27 cam. This kit  will be going on the one I'm building now, along with a 250S cam thanks to a trade with one of our cadre.  Both cams are the same as to almost doubling the duration but same lift. I wantnto see it running first as is.

 

https://www.6sigmajetkit.com/suzuki-lt-f-300-king-quad-jet-kit.html

trying to tempt me??

i bookmarked that link for future refernce.  thanks!

(don't tell my old lady)

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