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22-08-2018, 09:12 PM | #1 |
Registered User
Join Date: Mar 2007
Location: Gordon
Bike: M600
Posts: 95
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Engine verrrrry smokey
I think I've got a serious problem. Basically the bike has sat for 9 years and I've been trying to recommission it. I did the usual stuff, cleaned the carbs, new plugs, oil, belts etc. The bike is running OK'ish but after a few minutes starts to smoke heavily from the exhausts. To me it looks and smells like oil rather than petrol.
So other than stuck piston rings is there anything else it could be? |
22-08-2018, 09:14 PM | #2 |
Ciao, come stai?
Join Date: Apr 2003
Location: Somewhere
Bike: Multiple Monsters
Posts: 4,157
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Valve stem oil seals but I’d go for piston rings
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Monster 1200R! KTM 990 SuperDuke |
22-08-2018, 09:24 PM | #3 |
Registered User
Join Date: Mar 2007
Location: Gordon
Bike: M600
Posts: 95
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Hmm, thought so but I hoped not.
Is there anything worth trying before pulling the barrels off? |
22-08-2018, 10:07 PM | #4 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
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You could try a leak-down test, which would indicate if the exhaust valve, intake valve or piston rings weren't sealing properly. Any good workshop will be able to do this. I remember Practical Sportsbikes had a feature on how to make your own leak-down tester but I can't find it at the moment.
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23-08-2018, 09:01 AM | #5 |
Registered User
Join Date: Dec 2010
Location: Oslo
Bike: S2r
Posts: 428
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Have you checked your air box? Oil in it? So much that it pours into the intake?
Don't know how likely, but it has happened. In your case because (?) the crank case breather valve and/or breather tank is clogged.... Easy enough to check. |
23-08-2018, 10:16 AM | #6 |
Registered User
Join Date: Sep 2010
Location: Leics
Bike: M900
Posts: 2,848
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My Monster is very smoky and although it has plenty of compression and still runs well I know it's got a bore wear problem (recently replated bores failing) and so I'm planning to fix it over the winter.
But I inherited a lawnmower from my Dad which had been stood for some time and it was hugely smoky and ran very poorly with little compression. I suspected stuck rings and so filled the cylinder with various cocktails; diesel, 2-stroke oil, WD-40 etc. and after a couple of days it was fine and now runs like a champ. N.B if you do anything like this, don't forget to change the oil when you're done.
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M900, 916, LeMans II. |
23-08-2018, 11:19 AM | #7 |
Registered User
Join Date: Mar 2007
Location: Gordon
Bike: M600
Posts: 95
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OK thanks for the suggestions. I'm planning to do the following for taking the engine apart:
1 - Check the valve clearances then do a compression test. 2 - Check the crank case breather valve and breather tank. 3 - If there is low compression and the breather is OK, try filling the cylinders with some diesel. |
23-08-2018, 02:54 PM | #8 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,029
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Redex might be better than diesel?
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
23-08-2018, 05:20 PM | #9 |
Registered User
Join Date: Sep 2010
Location: Leics
Bike: M900
Posts: 2,848
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Possibly, I basically used a bit of everything I'd got to break free any corrosion as the cylinder & sump had flooded with old petrol (looked more like water).
I had some leftover 2-stroke mix fuel that I ran it on for a while to get nice & oily, seemed to do the trick.
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M900, 916, LeMans II. |
23-08-2018, 05:41 PM | #10 |
Too much time on my hands member
Join Date: Jun 2007
Location: Forest Of Dean
Bike: S2r
Posts: 3,196
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50/50 Acetone and Automatic transmission fluid.. Pour some in and top up untill it stops leaking past the rings.
Once the level stays constant the rings have popped back out and pretty much all the gaps filled with oil. The acetone loosens and eventually melts the gunge in the ring grooves and the oil is loose enough and carried with the acetone to lubricate. This is a bit of a cheapo plus gas mix, just a bit more aggressive. Best is to get the pistons out then clean the grooves, scotch-brite works well as it isn't too abrasive. The rigs do get more brittle with age but I'd guess would be OK.
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23-08-2018, 08:37 PM | #11 | |
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Join Date: Mar 2010
Location: Beachtown
Bike: M900
Posts: 2,188
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Quote:
Perhaps for the time it is in there it's not enough to cause a problem but I did a little search and this is what I found on the Web: http://www.efunda.com/designstandard...SC=Acetone#mat
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23-08-2018, 09:15 PM | #12 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,848
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Clutch and brake cleaner would probably be kinder to soluble plastics in the engine, but personally I would stick with Reddex. It's always been the "go to" stuff for stuck rings and top end lubrication.
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24-08-2018, 09:57 AM | #13 |
Registered User
Join Date: Mar 2007
Location: Gordon
Bike: M600
Posts: 95
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OK, maybe I'll try Redex first then the acetone/ATF if that doesn't help things. I really don't want to get into an engine out project just now as I've got enough on plate with other mechanical projects. I'll let you know how it goes.
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24-08-2018, 10:46 AM | #14 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,029
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I've used Parafin before to un-seize an engine before, and it had been underwater for some time.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
24-08-2018, 11:26 AM | #15 | |
Registered User
Join Date: Jul 2014
Location: Portsmouth
Bike: M900
Posts: 1,510
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Quote:
But I'd imagine you'll need to contemplate changing the valve seals reasonably soon. It can be done in frame on an early Monster. Just fill the cylinders with a soft rope to hold the valves up whilst you move the valve lifters etc to one side and change the seals. Although it's that easy to lift the heads off, what with there being no gaskets etc, I'd do it on the bench Nasher.
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