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eflyguy

Gearing, without turning it into a wheelie monster?

15 posts in this topic

YZ400F

Can't get out of first on most stuff, 2nd and perhaps a bit of 3rd on the long straight bits. Feel like I'm laboring the engine when I'm putzing along at low speed.

Suggested that I drop down one on the front, up 1 or 2 on the back. Not sure what's on there now but wondering if this is the right move?

Thoughts?

..a

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Add a flywheel weight if your bike doesnt have one already. I have one on my 426 and it really helps with trail riding and slow speeds plus you will get alittle more traction out of it. Im running a flywheel weight with a 49 tooth rear sprocket and the stock front sprocket. I have no problems out of it now when trying to ride slow in 1st gear.

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I have no issue with power, it'll haul my significant mass up any hill at any speed, I just feel like I should be using more of the motor for the speed I'm riding.

I'll pull it out tomorrow and see what's on there now..

..a

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Different bikes but I went up two in the rear. Didn't make it wheelie any more or any less that I can tell. It is a whole lot better in the Woods thou. Try it and if it doesn't help and you decide to get a FWW your only out $20

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14 / 49

I'm 250 before gear.

Can I go any smaller up front without stressing things? I'd rather not get a longer chain (the one that's on now is in very good condition)..

..a

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I added a flywheel weight and the wings in the carb on my crf 450 it helped a lot the wings seemed to smooth out out the low end and also made it start easier and cruise better, I tried lowering the gearing because first felt to high ( it is) but I ended up changing it back to stock

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Now, i could be wrong, but i THINK that you could run a 13 tooth front sprocket. As of right now, i am running 13/51 on my 450, and i think it's a pretty good combo for the woods and a little bit of track. It doesn't kill me on power either. If you drop a tooth on the front, i wouldn't add any on back until you try it first.

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its easier on the chain to add to the back when you are talking about 13 tooth front sprockets your chain will thank you

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OK, so 13t not recommended?

That's kind of why I asked. I know what damage can be done by too small front sprocket..

..a

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13's are original equipment on '06 and later YZ450's. It's a practical minimum size, and 13's do wear out noticeably faster than 14's, but they are still usable. Smaller sprockets will wear even faster, and are a bit tougher on the chain, as well as creating extra drag on the chain slider.

Bear this in mind when comparing gearing: The internal gearing of the YZF was changed in '05. The primary in the later bikes is higher by about the equivalent of 1 tooth on the front, so an '06 or so with a 13/49 is about the same as your 400 with a 14/49.

The trouble with lowering your gearing to make it more suitable for trailing is that it reduces top speeds much more than it lowers the minimum operating speeds.

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good stuff gray, kinda wonder why any bike would come with a 13 but then I figure its just good business,

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13's are original equipment on '06 and later YZ450's. It's a practical minimum size, and 13's do wear out noticeably faster than 14's, but they are still usable. Smaller sprockets will wear even faster, and are a bit tougher on the chain, as well as creating extra drag on the chain slider.

Bear this in mind when comparing gearing: The internal gearing of the YZF was changed in '05. The primary in the later bikes is higher by about the equivalent of 1 tooth on the front, so an '06 or so with a 13/49 is about the same as your 400 with a 14/49.

The trouble with lowering your gearing to make it more suitable for trailing is that it reduces top speeds much more than it lowers the minimum operating speeds.

Thanks. I'm not worried about top speed, I've never been in a situation where I've needed more than 3rd. For the type of riding I'll do with my family, the tall first gear won't be an issue, but for the more technical stuff at low speed, I could use it. As long as it won't damage the chain and primary, I'd like to give it a shot.

..a

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