Serious smoke after oil change |
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post #1 of 49 (permalink) Old 08-31-2017, 04:40 PM Thread Starter
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Serious smoke after oil change

Hey guys, new to the forum, but pulled up a lot of great info before getting the 4-wheeler, and some really great guys and info on here! Glad to be a part of it, and hoping I can get some help. I did some trading for a 94TRX 300FW that was in really good shape, but needed some love. So, over the last few days, I've changed out front and rear case oil, oil and filter, and some other nit pick stuff. When I got it, it didn't smoke a bit, which for it's age was impressive and a good sign of proper maintenance. WRONG! There wasn't a half quart of oil in it and was like sludge. After changing it and the filter, it smokes like a freight train! Used Honda oil and filter from the dealer here in town, and even took the filter cover off to make sure I didn't install it backwards, so it's installed correctly. My guess is I'm hosed and have to fork out a crap load for an upper build and valve job! Any input, suggestions? I read another guy had the same issue, and everyone said that it was weird and almost unheard of, but here's another case of the same issue.
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post #2 of 49 (permalink) Old 08-31-2017, 04:47 PM
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Unfortunately I'd say your right, top end build. Does the smoke get worse as the engine warms up or does it start to clear?

98 300 Fourtrax 4x4

350D rear end
Trx250a cam
Rear brake delete
SuperATV front discs
2" suspension lift
1” front fender lift
1” rear fender lift
2" wheel spacers
Superwinch up front (custom mount)
Plasma (synthetic) rope
Pro Grip bar grips
Pro grip hand guards
1 1/2" bar risers
Floor boards
Custom snorkel
Extended silicone breathers
24"x 8" innova mud gears up front
24"x10" innova mud gears on rear
Custom rear tow point

85 TRX250 - The Wife’s ride
No mods whatsoever.
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post #3 of 49 (permalink) Old 08-31-2017, 05:00 PM
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very possible he could have had straight lucas oil stabilizer in it, that will stop smoke, then when you put fresh oil in it goes to burning.

its not a big deal, download a service manual, study how to remove and reinstall top end, and you will be into a full rebuild for under $500 with OEM components with a new cam chain, rebuilt cylinder head and bored out cylinder.
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post #4 of 49 (permalink) Old 08-31-2017, 05:01 PM
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Complete top end re-build and flush out the bottom!! Change clutches to usually a burned up sludgy motor means burned up clutches..
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post #5 of 49 (permalink) Old 08-31-2017, 06:59 PM
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I think you need to open this motor up and do a full break down and cleaning, if oil was sludge up and thick, GOD Knows what else is in there
ONLY way to do it RIGHT is with a case split, major cleaning, and tear down, and then you can inspect all internal parts, and replace as needed
just think of it this way, do it right once and it will last a LONG time if you take care of it
sucks, but, these days, more scammers out there than not<

best of luck to you, a LOT of 300 IMIO experts here(I ain;t one of them ) but there are some great guys here that know them very very well, that can advice you if you decide to tear it down yourself and you need help
just ask and they will help you get it back up and going!
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post #6 of 49 (permalink) Old 08-31-2017, 07:42 PM
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chances are, if there was not oil in it to start with ?, then I would say the rings/cylinder is shot, and needs a top end rebuild. if it wasn't smoking from the get go ?, it's because it already burnt all the oil out !.
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post #7 of 49 (permalink) Old 08-31-2017, 09:12 PM Thread Starter
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Well, when I changed all the fluids in the crankcase and both axles, I didn't have a total of a quart in a 1 gallon paint can! I figured there wasn't enough oil in it to smoke when I went and looked at it, rode it and a good shake down. Dipstick was showing low and dirty, but I always change all fluids, filters, plug and everything anyway, so it didn't really bother me since it ran like a top, didn't smoke, no ticking valves or any sights or sounds of outright neglect. Really upsetting since I got it for duck season this year, and it's coming fast! I'm pretty well mechanically inclined, but having my doubts about such a project, and only been in the town I'm in since last February, when I got married, so don't know a good, reliable guy to take it to, or where to even get the parts that I need. I'm a little hot, but mostly dissapointed as a fella can be over this!
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post #8 of 49 (permalink) Old 08-31-2017, 10:18 PM Thread Starter
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And to answer your question SamUK, yes, the longer it runs the worse it gets. Even at idle, there's some smoke, but hit the throttle a touch, and you'll kill every mosquito with a 5 mile radius of my house! And I greatly appreciate all the input and if I have to go through the trouble of tearing it down, she's goin down! No since when your that far in to not do it right. I've always been a firm believer in that and always thinking ahead, so yes, timing chain, clutches and all, unfortunately. I won't say that my cup runneth over with cash with all the tools, equipment and trailer issues this year, but for another $150-$200 for clutches and what nots, I'd be a fool not to. I just sold a 3 wheeler tje 1st of the year that I bought brand new in 83, and it ran like a dream, hated to, but health issues dictated it, and won't be doing any major trail riding or anything like that with the 300, just something to leave at duck camp for the season to get back and forth from the house to where I'm hunting that day, so got to have something to help cover the 6,540 acres!
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post #9 of 49 (permalink) Old 08-31-2017, 10:27 PM
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this may not be something everyone would do, but you can dump about 1/2 a quart of lucas oil stabilizer in there and it will help keep the oil consumption to a minimum.

I don't always suggest it, but when a guy is in a pinch for cash/time, you can run that with no issues and it usually helps significantly until you can get down and rebuild it.
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post #10 of 49 (permalink) Old 08-31-2017, 10:40 PM Thread Starter
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I was scared to put anything in it, but I'll give it a shot and see what happens. I know it's got to be done, but if I can limp through for a bit, then I'll have the time to do it like I want to. Thanks for the tip!
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