96 trailblazer 250 hellllppp! - Polaris ATV Forum
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post #1 of 16 (permalink) Old 04-04-2019, 02:44 PM Thread Starter
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96 trailblazer 250 hellllppp!

i have a 96 trailblazer 250 , brand new topend from ritter cycle has spark has fuel has compression, so it should run right?!..wrong... well all i get is the occasional backfire it will not start at all, the crank seals are good, im running oil injector, also running premix 93 octane and klotz 2 stroke oil. also the timing is dead on

i have checked everything over and over again and all is showing good spark is strong,

what can it be that im missing please help
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post #2 of 16 (permalink) Old 04-04-2019, 02:51 PM
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Did this run previous to it going to ritters for a top end rebuild?
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post #3 of 16 (permalink) Old 04-04-2019, 03:38 PM Thread Starter
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it ran very poorly due to low compression, i had to shoot chain lube in the intake just to seal the rings enough to fire it up to move it to its final resting spot, the old piston was shot, all of his work checks out good

me and mr rick have had quite a few conversations over this engine, but hes 3 states away so he cant physically put his hands on it
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post #4 of 16 (permalink) Old 04-04-2019, 04:33 PM
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I'd start with verifying the carb is clean, functional, and setup correctly.
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post #5 of 16 (permalink) Old 04-04-2019, 08:47 PM
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Try a new spark plug

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post #6 of 16 (permalink) Old 04-05-2019, 05:47 AM
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Why are you running the injector AND premix? May be oil fouling the plug.
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post #7 of 16 (permalink) Old 04-05-2019, 07:12 AM
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After thought; why are you running premix and injector?

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post #8 of 16 (permalink) Old 06-07-2019, 04:19 AM Thread Starter
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Running premix and injector to rule out bad oil injector.... I'm thinking that's why I lost compression in the first place. No matter what I do I cannot get this engine to fire off for even a few seconds... The carb is not the issue it's good, I'm leaning towards a problem with ty flywheel ... Anyone ever had one go bad but still throw spark at the wrong time? Again... Keyway is not sheared...
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post #9 of 16 (permalink) Old 06-07-2019, 05:31 AM
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Did you replace the crank seals? Do a leak down on it.
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post #10 of 16 (permalink) Old 06-07-2019, 06:35 AM
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Quote:
Originally Posted by Logan45356 View Post
Running premix and injector to rule out bad oil injector.... I'm thinking that's why I lost compression in the first place. No matter what I do I cannot get this engine to fire off for even a few seconds... The carb is not the issue it's good, I'm leaning towards a problem with ty flywheel ... Anyone ever had one go bad but still throw spark at the wrong time? Again... Keyway is not sheared...
Never had the flywheel cause timing to be off without the key being sheared, but have had bad pulse generators and stator coils throw the timing off. Easy to check - mark the 'F' mark on the flywheel with white or yellow paint and check with a timing light - remove the plug and lay it on the head to allow the engine to spin easily making it easier to see the mark.

Maybe I missed it, but how much compression did you say the engine has?

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