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90 Polaris Won't Start

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90cc polaris 90
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20K views 9 replies 6 participants last post by  Bruce!  
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#1 · (Edited)
I picked up a 90 Polaris Sportsman that needs some work. It turns over, has good spark and compression is at 80. I have check all the safety switches and they are all working. I have cleaned the carb and even swapped out the carb with another I had just in case and the gas is good and flowing.
Starter fluid only seems to make it more difficult to turn over. No ignition or sputters. I am open to suggestions.

Thoughts?

Thanks for your help.
 
A
#2 ·
Sounds like low compression. Should be 90-110 psi

Engine Turns Over But Fails to Start

G No fuel
G Dirt in fuel line or filter
G Fuel will not pass through fuel valve
G Tank vent plugged or pinched
G Carb starter circuit plugged
G Engine flooded
G Low compression (high cylinder
leakage)
G No spark (Spark plug fouled)
ignition component failure
G Safety switches malfunctioning
(Ignition, Kill, Brake--to--start)
G Electrical malfunction
 
#4 ·
Crank seals? Factory is 130 psi. Check to make sure the crank case is not full of fuel?
 
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A
#5 ·
Compression is done dry

COMPRESSION TEST
1. Remove spark plug and install compression tester.
2. Connect high tension lead to a good ground on
engine.
3. Open throttle and crank engine until maximum
reading is obtained (approximately 3--5 seconds).
 
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