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  #1  
Old 06-02-2012, 04:08 PM
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Default 400ex noise problem

     

Hi everyone,

I recently bought a 400ex that did not run. The previous owner put new rings in, put it back together, the timing was off, so he let it sit. I have a friend who went to school to be a mechanic and I've been having him do most all the mechanical work on it. We got it running good.

I rode it for a few months, then a ticking started after one weekend of hard riding. My compression was down to 80 psi from 160 where it was when I originally got it. We re-adjusted the valves (they were too tight) psi is now up to 170, BUT the ticking is even worse than it was before.

We're thinking maybe the parts are just getting worn down.

What do you guys think?

Thanks!
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Old 06-03-2012, 11:40 AM
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Quote:
Originally Posted by Tuktuk08 View Post
Hi everyone,

I recently bought a 400ex that did not run. The previous owner put new rings in, put it back together, the timing was off, so he let it sit. I have a friend who went to school to be a mechanic and I've been having him do most all the mechanical work on it. We got it running good.

I rode it for a few months, then a ticking started after one weekend of hard riding. My compression was down to 80 psi from 160 where it was when I originally got it. We re-adjusted the valves (they were too tight) psi is now up to 170, BUT the ticking is even worse than it was before.

We're thinking maybe the parts are just getting worn down.

What do you guys think?

Thanks!
Interference between the piston and valves??
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Old 06-03-2012, 06:03 PM
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Originally Posted by 2fun View Post
Interference between the piston and valves??
Do you mean like the piston hitting the valves? I would think I would have a lot more damage done/less compression if that was the case, but I'm no mechanic.

Is it possible that the cam and rockers have gotten so worn down that they are just noisy now because of slop?
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Old 06-03-2012, 06:16 PM
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Quote:
Originally Posted by Tuktuk08 View Post
Do you mean like the piston hitting the valves? I would think I would have a lot more damage done/less compression if that was the case, but I'm no mechanic.

Is it possible that the cam and rockers have gotten so worn down that they are just noisy now because of slop?
Could be. I'm just throwing out suggestions here. How many hours are on the motor? What type of oil are you using?
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Old 06-03-2012, 07:49 PM
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I'm not sure how many hours it has.

And as for the oil, I forgot to mention that....... this was another one of my concerns. I made the rookie mistake of running 10W30 through it for the last two oil changes. I've been out of the riding game for a few years and didn't take the time to see what oil I should have been using and just put regular oil in.
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Old 06-03-2012, 08:09 PM
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Quote:
Originally Posted by Tuktuk08 View Post
I'm not sure how many hours it has.

And as for the oil, I forgot to mention that....... this was another one of my concerns. I made the rookie mistake of running 10W30 through it for the last two oil changes. I've been out of the riding game for a few years and didn't take the time to see what oil I should have been using and just put regular oil in.
Regular oil is probably fine. Sometimes synthetic can make a motor run cooler/quieter as well, but there's probably more to the story than just oil types.
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Old 06-03-2012, 09:46 PM
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I just serviced one for a customer of mine who always had the ticking since he bought it from the original owner. He wanted a stage 2 cam put in so I did and it still ticked. I ended up changing the timing chain and tensioner and problem solved, I can't tell you for sure that's you'r issue but thats what I had.
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Old 06-04-2012, 12:35 AM
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If it is regular auto oil this will smoke your clutch fairly quick.
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Old 06-04-2012, 06:41 AM
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^^ Not true, i've been running shell rotella in everything and have never had an issue.
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Old 06-04-2012, 06:48 AM
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^^ Not true, i've been running shell rotella in everything and have never had an issue.
Ok, Rotella is a good oil, but most auto oils will have "friction modifiers" or be rated as "fuel conservation" and oil with either of those markings will fry a clutch very quickly in either a 2 or 4 stroke dirt bike. Rotella does not carry either of those ratings.

Paw Paw
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Old 06-06-2012, 08:42 PM
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Thanks for all the input guys. I think I will go ahead and buy a new timing chain, tensioner, and cam just to play it safe.

If the noise is still there, well I guess I've probably got bigger problems to deal with.

---------- Post added at 08:42 PM ---------- Previous post was at 08:33 PM ----------

Another quick question.

I have the option of getting a stock, or manual timing chain tensioner.

Which would be the better way to go?
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Old 06-06-2012, 09:36 PM
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If you keep up on maintenance I would go manual IMO
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Old 08-31-2012, 11:04 AM
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Are you running premium fuel? Perhaps raising the octane level will help... too high of a compression ratio with too low of an octane rating can cause horrible knocking, pinging, and all sorts of other weird noises. You should always keep a minimum of 93 octane fuel.. I like to run a 50/50 mix of pump gas and VP race fuel when I can afford to, but that's getting harder and harder to do.
Today's gasoline with sometimes up to 10% ethanol added is horrible for bikes/atv's... I finally found a service station that guarantee's their fuel as ethanol free.. wish there was a way I could test it and make sure
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Old 10-14-2012, 09:58 AM
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I've just been running regular fuel. Usually 89 or 87 and 91 occasionally. Sometimes ethanol, but I try to stick away from it as much as possible. I could try to up my octane, but as bad as the noise is I don't see just changing fuel making enough of a difference, thanks for the pointer though, i will try it...….See newest thread for update on what I've done so far.
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