Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hi Guys,I have 3 m-90s 2 run great have one motor that ran 5 minutes and poof no spark checked everything, well figured ignition went ordered 2 from ebay  both lasted a few minutes each poof no spark again complete ignition change each time, I bought one more from Bang good  that one lasted 3 or 4 minutes cant believe it motor stopped no spark wow!I am on fire now LOL, this thing has got me baffled. I  tried 2 batterys even tried cutting the wires colored them changing senor changed plugs magnet has anyone got any ideas, would be deeply appreciated I hate to have $390 in a parts motor but its getting close to being one LOL Thanks guys.Ike