Oil injection - Polaris ATV Forum
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post #1 of 12 (permalink) Old 05-09-2019, 07:09 PM Thread Starter
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Oil injection

2005 trailblazer heavy exhaust smoke. The bike would not start so I pulled the bowl and found it full of oil. I drained it, re-installed, starts and runs good but is exhausting a lot of blue smoke. No carb adjustments have been made since it was new. Is there a common problem with the oil injection using too much oil or is there something else that is defective?
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post #2 of 12 (permalink) Old 05-10-2019, 05:30 AM
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Two strokes that have been setting can have a pool of oil on the crankcase floor - it typically takes a long time (10 to 20 minutes) of moderate running to lift all the oil off the crankcase floor and start running normally. Time will vary depending on the type and amount of oil, type of fuel used, speed the engine is run at and some other less important things. Run it for a half hour or more and then report on the amount smoke.

Most common problem with the oil pump is wrong type of oil and operator cable hanging up.

2006 Trailboss 330
2002 Sportsman 90
2005 TRX400EX (FOR SALE)
2003 LT-Z400 (needs engine work & is for sale)
2004 CRF250X
1971 Triumph 650 Bonneville (has 5 original miles)
1972 Triumph 650 Bonneville (undergoing restoration)
1979 Honda CBX (6 cylinder)
1970 Kawasaki G3SS 90cc Bushmaster
1976 Suzuki RE5 Rotary (not running & FOR SALE)
1981 Kawasaki KZ305-A
1981 Suzuki GS450T (undergoing repair & will be for sale when done)
1982 Kawasaki KZ750-H (FOR SALE)
1989 Honda VT1100C
2007 Vectrix VCTX Electric Scooter
1965 Montgomery Ward 3 1/2 HP Tecumseh Mini Bike
1970 Triumph T25 250cc Trailblazer
1968 Triumph 250cc Flat Tracker

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post #3 of 12 (permalink) Old 05-10-2019, 06:55 AM Thread Starter
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Thank you for the reply. I ran it for about 5 minutes the other day thinking it would clear out. I was thinking it may be accumulation of oil in the crankcase. Without the service manual, I wasn't sure if there was a drain on the bottom of the crankcase to empty from. No binding on the cables.
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post #4 of 12 (permalink) Old 05-10-2019, 08:32 AM
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When you say no binding on the cables, you can see the oil pump operate and it is returning to it's stop pin as the throttle is closed?

What kind of oil is in the tank? Polaris blue?

2006 Trailboss 330
2002 Sportsman 90
2005 TRX400EX (FOR SALE)
2003 LT-Z400 (needs engine work & is for sale)
2004 CRF250X
1971 Triumph 650 Bonneville (has 5 original miles)
1972 Triumph 650 Bonneville (undergoing restoration)
1979 Honda CBX (6 cylinder)
1970 Kawasaki G3SS 90cc Bushmaster
1976 Suzuki RE5 Rotary (not running & FOR SALE)
1981 Kawasaki KZ305-A
1981 Suzuki GS450T (undergoing repair & will be for sale when done)
1982 Kawasaki KZ750-H (FOR SALE)
1989 Honda VT1100C
2007 Vectrix VCTX Electric Scooter
1965 Montgomery Ward 3 1/2 HP Tecumseh Mini Bike
1970 Triumph T25 250cc Trailblazer
1968 Triumph 250cc Flat Tracker

Shop Owner and Mechanic with over 50 years experience
latebird is offline  
post #5 of 12 (permalink) Old 05-10-2019, 03:26 PM Thread Starter
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I can see the oil pump arm rest on its stop and open completely at full throttle. I assume that if It was left sitting with the throttle partially open It could seep through the pump? It has used Polaris blue since it was new.
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post #6 of 12 (permalink) Old 05-11-2019, 05:00 AM
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Whether the throttle is partially open or not, oil can seep through the pump

2006 Trailboss 330
2002 Sportsman 90
2005 TRX400EX (FOR SALE)
2003 LT-Z400 (needs engine work & is for sale)
2004 CRF250X
1971 Triumph 650 Bonneville (has 5 original miles)
1972 Triumph 650 Bonneville (undergoing restoration)
1979 Honda CBX (6 cylinder)
1970 Kawasaki G3SS 90cc Bushmaster
1976 Suzuki RE5 Rotary (not running & FOR SALE)
1981 Kawasaki KZ305-A
1981 Suzuki GS450T (undergoing repair & will be for sale when done)
1982 Kawasaki KZ750-H (FOR SALE)
1989 Honda VT1100C
2007 Vectrix VCTX Electric Scooter
1965 Montgomery Ward 3 1/2 HP Tecumseh Mini Bike
1970 Triumph T25 250cc Trailblazer
1968 Triumph 250cc Flat Tracker

Shop Owner and Mechanic with over 50 years experience
latebird is offline  
post #7 of 12 (permalink) Old 05-11-2019, 05:43 AM Thread Starter
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Well that sucks. Is that inherent problem with these? We have had this bike since new and never had this problem.
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post #8 of 12 (permalink) Old 05-11-2019, 10:55 AM
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It's inherent to all two strokes with oil pumps and the higher the oil tank is located above the pump the more likely it is to happen - happens on older vehicles more so than new ones and the problem is exacerbated with alcohol blended fuel over non-ethanol fuel.

Just drive it and don't concern yourself about the smoke unless it is getting oil from somewhere else (like the counter balance in the 400) which the 250 doesn't have - only thing you can do is monitor the oil usage to make sure is is not using at an extraordinary rate.

2006 Trailboss 330
2002 Sportsman 90
2005 TRX400EX (FOR SALE)
2003 LT-Z400 (needs engine work & is for sale)
2004 CRF250X
1971 Triumph 650 Bonneville (has 5 original miles)
1972 Triumph 650 Bonneville (undergoing restoration)
1979 Honda CBX (6 cylinder)
1970 Kawasaki G3SS 90cc Bushmaster
1976 Suzuki RE5 Rotary (not running & FOR SALE)
1981 Kawasaki KZ305-A
1981 Suzuki GS450T (undergoing repair & will be for sale when done)
1982 Kawasaki KZ750-H (FOR SALE)
1989 Honda VT1100C
2007 Vectrix VCTX Electric Scooter
1965 Montgomery Ward 3 1/2 HP Tecumseh Mini Bike
1970 Triumph T25 250cc Trailblazer
1968 Triumph 250cc Flat Tracker

Shop Owner and Mechanic with over 50 years experience
latebird is offline  
post #9 of 12 (permalink) Old 05-11-2019, 12:22 PM Thread Starter
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Thanks for the advice. I'll rip on it once this rain let's up so I can post an update.
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post #10 of 12 (permalink) Old 05-16-2019, 08:18 PM Thread Starter
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After about 30 minutes of moderate riding, the thick cloud of oil smoke started to look normal. I guess it just needs to ridden more often.
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