rotax 470 problem - Snowmobile Forum: Your #1 Snowmobile Forum

billybob254 · 02-07-2010, 08:24 PM

i ave 0ne mach 1 in my garage the compresion whas ok on the 2 cyl. (125 each) i ave very good fire on the 2 spark plug the carb was clean the engine start and run good at iddle when i remove the left spark plug wire the engine dont change song but when i remove the right one the engine stall like if i ave cut out the engine. I ave tried to take a ride with the sled and it run to about 100 feet and dont do more like if the engine ave any power. If you can help me it will be very apreciated

Form583 · 02-07-2010, 11:12 PM

Double check the plugs and the spark. If you have good spark and good comp., it must be no fuel. Carb or delivery problem. Maybe bad air leak on that cyl.

**smallengineguy** · 02-08-2010, 06:29 AM

There's a problem with the left side cylinder. CHange that plug first.

billybob254 · 02-08-2010, 11:39 AM

i ave put 2 new spark plugs and i tried to put the right one at the left side and it dosent change nothing I look at the color of the plug and one is like new and the other is brown so its seem to ave no gas but the main jet and the fuel dilyvery is ok clean and work well i know what it take to an engine to run but in this case i dont understand nothing good fire (the fire jump beside the spark plug to the wire when i am at 1 inch from one the other ) comp.(125 each side) fuel delivery all clean gas mix by the pump so i dont understand

**smallengineguy** · 02-10-2010, 06:13 AM

CHeck compression on that cylinder next.

billybob254 · 02-10-2010, 09:16 AM

if the crank seal was bad does it can do it