I have a new KX450f 07 and I am noticing that the chain is fitting the frame were the rear trianlge on the bike bolts onto the frame. Its right were the little bar that makes up the airbox bolts into the frame well my chain is slapping it and rubbing it and I adjusted the chain with the three finger method. Does this happen no matter what or do i need to tighten my chian?
Chain Hitting The Frame?
Started by Sombrio, Oct 05 2007 12:45 PM
8 replies to this topic
Posted 05 October 2007 - 12:45 PM
I have a new KX450f 07 and I am noticing that the chain is fitting the frame were the rear trianlge on the bike bolts onto the frame. Its right were the little bar that makes up the airbox bolts into the frame well my chain is slapping it and rubbing it and I adjusted the chain with the three finger method. Does this happen no matter what or do i need to tighten my chian?
Posted 05 October 2007 - 08:56 PM
yup, just a little on the loose side and you will hear it. Also happens on older stretched chains. The side to side movement when the links stretch cause the issue as well.
new chain and proper adjust and your good.
new chain and proper adjust and your good.
Posted 06 October 2007 - 03:12 AM
I reckon mine does it even when I've just adjusted the chain, and its a new replacement chain (narrow style)
It mainly does it at neutral revs, under acceleration its fine.
I think its a stupid design.:thumbsdn:
It mainly does it at neutral revs, under acceleration its fine.
I think its a stupid design.:thumbsdn:
Posted 06 October 2007 - 05:19 AM
As Emerica5 pointed out, this is a solved/old/searchable topic.
Bad design yes. Bolt boss needs 3mm more clearance. Happens more so when coasting at low speeds. We are not being pedantic. It is very loud. As in obvious above the engine/exhaust noise.
Chain tension is not the cause. I tried that on day one. Still happened at 45mm. So not the cause in my case, but over-loose certainly does not help. Since solving it, I run my chain on the loose side of the tolerance, and I have a fat O-ring chain, yet the problem is gone.
Solution is sprocket alignment. ie. Don't trust your rear axel position marks. Q. a problem for all KX450Fs? Who knows! Certainly seems to be a problem for a few of them. Very easy to 95% eliminate. :thumbsup:
Bad design yes. Bolt boss needs 3mm more clearance. Happens more so when coasting at low speeds. We are not being pedantic. It is very loud. As in obvious above the engine/exhaust noise.
Chain tension is not the cause. I tried that on day one. Still happened at 45mm. So not the cause in my case, but over-loose certainly does not help. Since solving it, I run my chain on the loose side of the tolerance, and I have a fat O-ring chain, yet the problem is gone.
Solution is sprocket alignment. ie. Don't trust your rear axel position marks. Q. a problem for all KX450Fs? Who knows! Certainly seems to be a problem for a few of them. Very easy to 95% eliminate. :thumbsup:
Posted 06 October 2007 - 07:38 PM
So the go would be to measure from the centre of your swingarm pivot bolt to the centre of the rear axle? I'll try it. We'll see if the allignment marks are right or not.
Posted 06 October 2007 - 08:21 PM
I took my chain off and put a straight edge on the rear sprocket and looked toward the front sprocket and thought "Well I'll be ......".
Posted 06 November 2007 - 08:18 PM
Went to Dumont this weekend and while out there, noticed my chain destroyed my subframe/frame. Finally got my paddle taken off and my regular tire thrown back on so I figured Id get on cleaning up all the things on my bike that are going bad (case is leaking from the bottom and not from the oil drain, accidently stripped the small oil drain bolth and found out the night before leaving to Dumont, and while at Dumont noticed there was oil or something im figuring came from all the air filter oil from my filter skin and oiled filter coming from the boot connecting my carb and head). Tried to get off my subframe and the bolt is destroyed, refuses to come out. What makes me madder is that when my bike got taken in to be serviced, the stealership stripped the same subframe bolt and is hours away so I couldnt take it back to have them fix it. I had to take a hammer to an allen key to force it to stay in there so I could try to get the bolt out. Luckily I got a replacement bolt for my subframe, unluckily I more than likely stripped out my subframe thread by using all sorts of methods to get the bolt to back out. Looks like when I take my bike in to have my case looked at and fixed, im going to have to get my frame fixed as well.
