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Discussion Starter #1
Hello,

Today I went for a little ride and noticed a rattle that sounds like it is coming from around the exhaust to steering shaft. I think it is the exhaust but just want to make sure it’s nothing major. I’ve done some research and people are also saying that it could be the cam chain. It is probably also worth mentioning that it only rattles when I’m Reving it up/accelerating. (1986 Honda trx350 btw)

Any ideas?
 

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does your model have the decompression lever on the top right side of rocker box ?, if so , is it loose ?. not many cam chains on that model rattle, but !!..it very well could be a worn cam chain !!. being an '86 ?, its prob never been changed !..lol.
 

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Discussion Starter #3
does your model have the decompression lever on the top right side of rocker box ?, if so , is it loose ?. not many cam chains on that model rattle, but !!..it very well could be a worn cam chain !!. being an '86 ?, its prob never been changed !..lol.
Does a decompression lever have a spring around it and a wire going to it? Because is so it does. The more I listen to it the more I think the sound is coming from outside the motor but that’s just me.
 

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Discussion Starter #4
does your model have the decompression lever on the top right side of rocker box ?, if so , is it loose ?. not many cam chains on that model rattle, but !!..it very well could be a worn cam chain !!. being an '86 ?, its prob never been changed !..lol.
I just started it and warmed it up for a bit and the sound stopped once it was warmed up... but I also noticed a shaking noise when reving down after it was warmed up...

Now I’m really confused?
 

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does your model have the decompression lever on the top right side of rocker box ?, if so , is it loose ?. not many cam chains on that model rattle, but !!..it very well could be a worn cam chain !!. being an '86 ?, its prob never been changed !..lol.
I just started it and warmed it up for a bit and the sound stopped once it was warmed up... but I also noticed a shaking noise when reving down after it was warmed up...

Now I’m really confused?
noise stopped once warmed up ?, this tells me the valves need attention. shaking noise ?, like a whirling ..then clunk ?, this is the clutch one-way centrifugal clutch bearing.
 

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Discussion Starter #6
does your model have the decompression lever on the top right side of rocker box ?, if so , is it loose ?. not many cam chains on that model rattle, but !!..it very well could be a worn cam chain !!. being an '86 ?, its prob never been changed !..lol.
I just started it and warmed it up for a bit and the sound stopped once it was warmed up... but I also noticed a shaking noise when reving down after it was warmed up...

Now I’m really confused?
noise stopped once warmed up ?, this tells me the valves need attention. shaking noise ?, like a whirling ..then clunk ?, this is the clutch one-way centrifugal clutch bearing.
I just replaced the one way starter clutch/one way bearing if that is what you’re referring too, used a oem one too. I remember hearing a whirling sound but not a clunk.
 

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I just started it and warmed it up for a bit and the sound stopped once it was warmed up... but I also noticed a shaking noise when reving down after it was warmed up...

Now I’m really confused?
noise stopped once warmed up ?, this tells me the valves need attention. shaking noise ?, like a whirling ..then clunk ?, this is the clutch one-way centrifugal clutch bearing.
I just replaced the one way starter clutch/one way bearing if that is what you’re referring too, used a oem one too. I remember hearing a whirling sound but not a clunk.
starter clutch and centrifugal one-way bearing is TWO different bearings and two different sides...lol. starter clutch is on left side, centrifugal clutch one-way bearing is on right side.
 

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Hello,

Today I went for a little ride and noticed a rattle that sounds like it is coming from around the exhaust to steering shaft. I think it is the exhaust but just want to make sure it’s nothing major. I’ve done some research and people are also saying that it could be the cam chain. It is probably also worth mentioning that it only rattles when I’m Reving it up/accelerating. (1986 Honda trx350 btw)

Any ideas?

Check the exhaust protector and drive shaft cover—if the bolts are missing they will rattle.
 

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Discussion Starter #9
I just started it and warmed it up for a bit and the sound stopped once it was warmed up... but I also noticed a shaking noise when reving down after it was warmed up...

Now I’m really confused?
noise stopped once warmed up ?, this tells me the valves need attention. shaking noise ?, like a whirling ..then clunk ?, this is the clutch one-way centrifugal clutch bearing.
I just replaced the one way starter clutch/one way bearing if that is what you’re referring too, used a oem one too. I remember hearing a whirling sound but not a clunk.
starter clutch and centrifugal one-way bearing is TWO different bearings and two different sides...lol. starter clutch is on left side, centrifugal clutch one-way bearing is on right side.
Hello,

Today I went for a little ride and noticed a rattle that sounds like it is coming from around the exhaust to steering shaft. I think it is the exhaust but just want to make sure it’s nothing major. I’ve done some research and people are also saying that it could be the cam chain. It is probably also worth mentioning that it only rattles when I’m Reving it up/accelerating. (1986 Honda trx350 btw)

Any ideas?

Check the exhaust protector and drive shaft cover—if the bolts are missing they will rattle.
Noticed it only rattles at a certain rpm, about 1/4 throttle if that gives you an idea
 

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Discussion Starter #10 (Edited)
I just started it and warmed it up for a bit and the sound stopped once it was warmed up... but I also noticed a shaking noise when reving down after it was warmed up...

Now I’m really confused?
noise stopped once warmed up ?, this tells me the valves need attention. shaking noise ?, like a whirling ..then clunk ?, this is the clutch one-way centrifugal clutch bearing.
I just replaced the one way starter clutch/one way bearing if that is what you’re referring too, used a oem one too. I remember hearing a whirling sound but not a clunk.
starter clutch and centrifugal one-way bearing is TWO different bearings and two different sides...lol. starter clutch is on left side, centrifugal clutch one-way bearing is on right side.
Hello,

Today I went for a little ride and noticed a rattle that sounds like it is coming from around the exhaust to steering shaft. I think it is the exhaust but just want to make sure it’s nothing major. I’ve done some research and people are also saying that it could be the cam chain. It is probably also worth mentioning that it only rattles when I’m Reving it up/accelerating. (1986 Honda trx350 btw)

Any ideas?

Check the exhaust protector and drive shaft cover—if the bolts are missing they will rattle.
Sorry for wasting everyone’s time... it was in fact the exhaust protector, the bolt wasn’t loose but it was rattling so I put my hand on it and stopped. Still don’t know why I could hear a whirling and shaking noise from the top end though...

Thanks for the help
 

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Sounds good
Be careful loosening or tightening those down. Use plenty of oil, low torque to remove and work them in and out a quarter turn at a time so the bolt doesn’t get too hot.
To install They require a flat and lock washer or they won’t seat and you’ll break the bolt. I used a tap and plenty of oil to clean up the threads but you can’t cut very far. Then use permatex antiseize on bolt threads.
 

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Sounds good
Be careful loosening or tightening those down. Use plenty of oil, low torque to remove and work them in and out a quarter turn at a time so the bolt doesn’t get too hot.
To install They require a flat and lock washer or they won’t seat and you’ll break the bolt. I used a tap and plenty of oil to clean up the threads but you can’t cut very far. Then use permatex antiseize on bolt threads.
Did you break a bolt?
 

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Discussion Starter #13
Sounds good
Be careful loosening or tightening those down. Use plenty of oil, low torque to remove and work them in and out a quarter turn at a time so the bolt doesn’t get too hot.
To install They require a flat and lock washer or they won’t seat and you’ll break the bolt. I used a tap and plenty of oil to clean up the threads but you can’t cut very far. Then use permatex antiseize on bolt threads.
Did you break a bolt?
Yeah I broke a bolt.... I sprayed a bunch of free in it and let it sit for a while but I put my ratchet on it and tried to turn it just a bit and it snapped. I can almost guarantee that it’s never been removed. I’m going to try to oil the other two up better and try to get them out without breaking them then hit the broken one out with a screwdriver with a screwdriver and hammer.
 

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Those tiny bolts are easy to break—here’s how to remove.
remove the pipe and take to a machinist.

You have to drill it out and tap the threads. You ever use tap and die? It’s simple work if you’ve done it before but problem is those are short pieces welded to the pipe

Drill with cobalt bits—start really small. Smaller than a pencil lead. Start dead in the middle of the bolt. Stake with a center punch if you can. Your can try to use an easy out but I wouldn’t try it—break the easy out and you’ll def need a machinist.

Use the right tap i just did mine i can remember what size
 

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Discussion Starter #15
Those tiny bolts are easy to break—here’s how to remove.
remove the pipe and take to a machinist.

You have to drill it out and tap the threads. You ever use tap and die? It’s simple work if you’ve done it before but problem is those are short pieces welded to the pipe

Drill with cobalt bits—start really small. Smaller than a pencil lead. Start dead in the middle of the bolt. Stake with a center punch if you can. Your can try to use an easy out but I wouldn’t try it—break the easy out and you’ll def need a machinist.

Use the right tap i just did mine i can remember what size
I know it sounds lazy, and it is but I don’t feel like messing with it too much. I’m going to give it a little tap from the welder and leave it to the next person to fix it. If it’s not rattling then there is no reason for the buyer to look. Probably not going to sell it for a few years and I don’t mind it being welded.

Thanks for telling me the proper way
 
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