merc 240 efi

Hello, I have a 2001 Challenger 1800 240 EFI M2 Gen 1. When I start the engine cold, it idles at 1100 RPM (as specs). After running it for a while and getting the engine warm, when I reduce the throttle to idle, it idles really high around 1800 - 2000. Even if I shutdown the engine for 10-15...

Hello Everyone, I have a 2001 Challenger 1800 240 EFI M2 Gen 1. I recently got this boat fixed and had 2 trips only on it. Previous issue was that boat was starting every time, but then dying after 2-3 seconds and the reason was because not all cylinders were firing because of a bad trigger...

Hello Everyone, I have a 2001 Challenger 1800 240 EFI M2 Gen 1. I have this really weird issue, I can always start the engine, not right up, but after few tries. The engine starts, runs for 2 seconds or so and then dies. I fixed few things which were bad, but still have the same issue, but now...

Hi All, long time reader first time poster… I have a 2000 Islandia with its original 1999 Mercury M2 jet, 240 EFI. Here’s the situation… I bought it this past winter. It fired up and ran when shown. When I went to clean it up and fire it up for the first time this spring, it will crank, turn...

so I decided to purchase a 2001 Sea Doo Challenger 2000. I had it on the water Friday pulling a tube around and it ran really well. Took it out again today pulling a tube around and it would randomly cut out while driving. It would start right back up again, but I’m curious what might be...

I have a 2001 Challenger 1800 with a two stroke Mercury 240 EFI M2 Jetdrive (Powerhead) V6 motor. Serial number 0E383172. I just bought the boat a couple of weeks ago and I am a first time boat owner. The person I bought it from started it in his back yard and cut it off after a few seconds to...

Hi All, My family purchased a 2004 Seadoo Speedster with Mercury M2 240 engine (2nd gen) last year. We used it all last year without any major issues. First trip out this year everything started fine, but about 20 minutes into our trip (while cruising at about 4K) the rpms started to dip and...

Hello! I’ve been stalking the threads for a few hours now because I’m interested in buying a 2002 Islandia - Mercury Powerhead 240 HP two stroke. $4500 The catch is, the ad states “NEEDS NEW MOTOR/ powerhead needs replaced” and that’s honestly the extent of the information. I grew up driving...

Hi All, What’s the best way to drain my two stroke oil on my 2001 speedster 240 efi? I put some of the mercury premium plus synthetic blend two stroke oil in (in the black bottle, picture attached), and noticed that it’s been smoking more than the quicksilver normally does - is that possible...

First off, I would like to thank everyone on this forum as I have done a ton of trial and error after reading the available posts/threads on this exact topic. I have a 2001 seadoo speedster with 240 EFI. The oil tank is on the port side of the engine if that helps determine which engine version...

My 2004 utopia its acting weird. ( merc 240 efi) New to boating so here it goes... Throttling up and the engine seen to respond to the throttle (RPM's go up ) but the boat does not repond. The closest thing I could compare it to to, is to a car transition slipping , limited propulsion while...