I have a 96' GTI, wintered with 6 gals fuel treated with stabilizer. Took it out 2 weeks ago, put in 6 more gallons fresh gas and 6 more ounces Sea foam ,still had last years plugs, boat ran fantastic. Took it out 2nd time and at half throttle it begins to backfire thru front cylinder carb will not smooth out regardless. Get it home check fuel screen and no sediment, change plugs gap to .024 still backfires, compression test cylinders get 130 psi plus, remove front plug wire while running, throttle up on rear cylinder firing only and it runs no misses, put front plug wire on and remove rear plug wire, give it full throttle and misses backfiring thru front carb. Carbs have never been touched since I've owned it, always fog after using and for winter storage owned this GTI for 17 years not one problem, also I run Taucetti screen covers on the carbs. Am I looking at a bad ignition coil or possibly a magneto issue. Would greatly appreciate any knowledgeable advice. Thank you for reading my post.
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Misfire front cylinder
- Thread starter seaputt2
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russellb
New Member
I did a google search on engine backfires and found that a lean carburetor can cause a backfire through the carb. I'm not an expert and don't work on engines for a living but adjusting the carb seems like an inexpensive fix if it works. It might be worth having the carbs professionally rebuilt if they haven't been worked in 17 years. I'd probably start with trying to adjust the front carb a little richer just to see what will happen. Does the seafoam bottle say it's safe for 2 strokes? Just curious. I think I'd be worried putting it in my 2 stroke. Hope someone else jumps in here. I know there are many people on here who know more than me about 2 strokes. Maybe even a few people who can give some good advice about adjusting the carbs.
I know you started another thread, but do you still have the gray tempo lines for the fuel system? If so, I wouldn't even go to the water until you replace those and clean the carbs completely. I think you need to service the fuel system before you do any irreversible damage if it indeed is running lean.
Thanks once again for stepping up again Russell, appreciate the research you've done for me. On the Seafoam product its a 2 stroke, 4 stroke and diesel additive which may be added to fuel or crankcase. They also make a "Fogging Oil" which you spray in your carbs after use and into the cylinders. My 3 buddies with a total of our combined 12 seadoos have been using these products since 1993, that's why we feel our older boats have lasted from us, our grown kids and now grandkids use. Truly appreciate the time you've invested trying to help me out. "Burn gas and go fast"!!
Hi RacerXXX I would say your right about the fuel lines and especially being original equipment. What would you suggest the type of new composition for the line replacement. Also do you or maybe someone else know the number of adjustment turns you will make once you have seated the carb screws down. I figure since I going to replace the lines I'll go ahead a pull the carb's. Have pretty good mechanic skills, are these carbs diaphragm type? I'm a new member as you can probably tell. Do I have to enter a new password in order to access the online manuals available to us, still trying to learn how to navigate the site. Is there a site tutorial that I've managed to overlook?
The password for the manual is on the same page as the mual itself. If you are a premium member you will be able to see it.
Besides the lines, the carbs will need to be opened up, CLEANED BIG TIME as well as the internal filters. The fuel selector needs replaced or majorly cleaned..
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Besides the lines, the carbs will need to be opened up, CLEANED BIG TIME as well as the internal filters. The fuel selector needs replaced or majorly cleaned..
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Automotive fuel line from your local auto parts store will work.
The fuel selector needs to be replaced or a very major cleaning. Many times after being cleaned, the center seal goes bad and sucks air, just a heads up.
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The fuel selector needs to be replaced or a very major cleaning. Many times after being cleaned, the center seal goes bad and sucks air, just a heads up.
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russellb
New Member
No problem. It looks like it worked out as a thumbs up in the end. I understand your frustrations with your seadoo. I bought 2 last year and still don't have all the bugs worked out. I just dropped them both off at a repair shop on Friday. Had a bad experience with a repair shop in the past if you ever want to hear about that. Don't want to get off the subject here. Hope you get it worked out soon.
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