jnjtrukin
10-24-2007, 07:18 AM
I have a 2002 Yamaha Big Bear 400 2x4. The thing ran like a beast until last winter I was living somewhere different and made the mistake of storing the bike outside uncovered during the snowy wet Ohio winter. (I know this was STUPID)
when I went to start it up this spring it wouldn't start so I replaced the battery. Started up fine after replacing the batter but it only has about 1/2 the power it used to, the motor sounds like it's rev'd out but you'r only going about 30 mph in 5th gear and when you try to go up a hill it really runs out of power.
So I started with replacing/.cleaning the items I thought could be the cause. I cleaned up the front breaks, made sure the pistons weren't stuck and there was no drag, there also seems to be no drag on the rear wheels when I have it jacked up with the bike in neutral. I then replaced the air filter and spark plug thinking they could be the culprit, but no luck, bike runs about the same. So I moved on to the carb, took it all apart, cleaning all the jets, floats, bowl, slide and other sections I could find, put it back together and in the bike, but still the same issue. The only improvement is now the bike will idle without the choke on.
So I could use some guidance on what else could rob the power from the bike like it has, it's a very noticable difference.
Thanks,
Jason
when I went to start it up this spring it wouldn't start so I replaced the battery. Started up fine after replacing the batter but it only has about 1/2 the power it used to, the motor sounds like it's rev'd out but you'r only going about 30 mph in 5th gear and when you try to go up a hill it really runs out of power.
So I started with replacing/.cleaning the items I thought could be the cause. I cleaned up the front breaks, made sure the pistons weren't stuck and there was no drag, there also seems to be no drag on the rear wheels when I have it jacked up with the bike in neutral. I then replaced the air filter and spark plug thinking they could be the culprit, but no luck, bike runs about the same. So I moved on to the carb, took it all apart, cleaning all the jets, floats, bowl, slide and other sections I could find, put it back together and in the bike, but still the same issue. The only improvement is now the bike will idle without the choke on.
So I could use some guidance on what else could rob the power from the bike like it has, it's a very noticable difference.
Thanks,
Jason