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Old 06-20-2016, 12:55 PM   #1
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05 Trx 450 problem

Hey guys I just got my 450 from a buddy. 1 year ago he had the motor rebuilt top and bottom and put a 480 big bore kit. Has power commander and slip on exhaust. After the build the bike ran great. but he didn't even get 5gal of gas through it until it died. He was riding at the track hit a jump and it died in mid air. He landed popped the clutch to push start it. Hit the next jump died again in mid air and hasn't ran since. I just picked it up and saw that the oil is milky when looking through the site glass. Any ideas? I have only owned 2 stroke dirt bikes. Don't know much about these 4 strokes. Any thoughts that could help would be greatly appreciated.

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Old 06-20-2016, 01:22 PM   #2
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milky oil is a sign of water in it......maybe hit the rev limiter and popped the head gasket? Could be a multitude of issues
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Old 06-20-2016, 01:27 PM   #3
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Yea that was my first thought. Just trying to get an idea of what steps to take and get this thing going again. He said with the big bore I need to run 110 race gas. Does that sound right?
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Old 06-20-2016, 02:59 PM   #4
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Quote:
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Yea that was my first thought. Just trying to get an idea of what steps to take and get this thing going again. He said with the big bore I need to run 110 race gas. Does that sound right?
depends on the compression they were running..........


I would check piston compression/leak down first
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Old 06-20-2016, 03:12 PM   #5
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How long since it last ran?
In other words, how long has it sat with water in the crankcase?
Can you tell how full the crankcase is?
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Old 06-20-2016, 03:16 PM   #6
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Not sure on the compression it's was running I'll ask see if he knows. It has been sitting for a year. It looks to be almost at the top of the sight glass. You can see the top of the liquid. Still has a compression when you kick it just not as much as it had.
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Old 06-20-2016, 03:50 PM   #7
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There could be all sorts of problems or not many at all.
Byrd is right, start with a compression leak down test. It's not unlikely you'll have to pull the head and replace the gasket. If that's all it is, no big deal.
On the other hand it could have bent some stuff if enough water got in there. Sounds like that's not the case, if you can see the top of the liquid in the sight glass, that's not terrible.

But you have to ask yourself, why won't it run. A little water in the oil wont stop it, not till it turns to peanut butter and goos stuff up.
Maybe the gasket is blown so bad the compression is too low...
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Old 06-20-2016, 03:56 PM   #8
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Thanks for the replies guys now I have a starting point. Will the compression tester that screws into the spark plug work?
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Old 06-20-2016, 04:24 PM   #9
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Thanks for the replies guys now I have a starting point. Will the compression tester that screws into the spark plug work?
yes, get it set up and then kick like till the needle stops climbing.
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Old 06-20-2016, 04:29 PM   #10
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And the leak test is something else right? To make sure the cylinder isn't leaking?
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Old 06-20-2016, 04:40 PM   #11
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yes, get it set up and then kick like till the needle stops climbing.
Make sure you have the throttle wide open.
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Old 06-20-2016, 06:04 PM   #12
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First pull the plug and make sure the cylinder is clear of water. a little water will kill a piston and rod..
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Old 06-20-2016, 08:23 PM   #13
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Well I didn't have time to go buy a compression tester today. I called my buddy and ask what ratio it had he thinks 13:1 but I will call the shoo he got it built at tomorrow to confirm. If it is 13:1 would that indeed mean race gas only?
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Old 06-20-2016, 08:27 PM   #14
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Sounds like my kx450 when my crank was locking up.
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Old 06-20-2016, 08:43 PM   #15
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How hard/pricey was that crank to replace
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Old 06-20-2016, 10:12 PM   #16
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gonna be a complete teardown to do the crank. Its not hard, but it is alot of parts lol
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Old 06-21-2016, 05:15 AM   #17
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Quote:
Originally Posted by Japawhat02 View Post
gonna be a complete teardown to do the crank. Its not hard, but it is alot of parts lol
Not hard? Shiiiit......its a complete tear down of the entire motor!
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Old 06-21-2016, 05:37 AM   #18
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Well let's just hope it's not the crank then lol
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Old 06-21-2016, 05:42 AM   #19
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I think we are getting ahead of ourselves here. First diagnose the problem (Im not sure What a locking up crank has to do with water in the engine), secondly if the oil was milky and it sat as you said for a year like that, I would think the bearings and would be toast. Someone correct me if Im wrong but wouldnt they all be rusted up if it sat that long with an Oil/water mix?
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Old 06-21-2016, 06:05 AM   #20
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Drain the oil first. Flush, drain, flush. Before I did anything I'd pull the jug to have a look. If it sat that long you need to go in the bottom end. When I did a lot of river/mud riding it wasn't a big deal to sink a bike, if you flush it right away and don't keep turning it over forcing water everywhere.

I've ran a 13.1 setup on 93, but the CR advertised and actual can be different depending on other things.

Drain and refill at least. Then start figuring it out.
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