[dskogman]

I have a 2002 Yamaha 130 2-stroke that continually fouls plugs after a day of fishing. It starts out fine but after a day of combined crusing and idling it will no longer idle. If I keep running it will start missing at higher speeds also. Take the plugs out and they are wet. I install a new set of NGK BR9HS-10's and it runs fine for a while but gradually gets worse. I got the engine new in the crate and installed it (11 months ago) on a flats boat I built with a brand new aluminum tank so there is no gunk in it. It has had the problem since it was new and I originally thought it was due to the pre-mix I was running for break-in but no luck. I then got the shop manual and checked all the adjustments and found the oil injection pump linkage was a little off. I adjusted that and also set the pilot screws as low as as 1/2 turn but still no luck. At this point I am about convinced that the motor is just not designed for any extended idling/slow speed running and am ready to trade it on an injected 2-stroke or 4-stroke. Any ideas on how to make this thing work or am I wasting my time?

[robnik1]

what are you calling pilot screws? I have a 150 2003 that is not using any oil. If there is an adjustment for increasing oil usage I would like to know.Thanks

[rodbolt]

hello do an oil consumption test. also check the spark plug cap resistance. the 130 and 115 two strokes would idle for a long while. also test the fuel pump for any diaphram leakage. if all of th4e above check out then double check your link and sync. you also may want to check the float height. good luck and keep posting

[vinney]

What manufacuture of oil do you run. That would make the biggest difference. Oil pumps dont go bad. If it runs well its not the float heights. Yamaha lube only.

[rodbolt]

hello oil pumps do go bad. I have had 2 already this year as a warrenty issue. the shaft seals will leak and cause excess oil to be forced into the crankcase. the float height can be to high and the motor will idle albeit somewhat richer. richer can foul plugs. I reccomend yamalube as well however I have a lot of commercial guys banging about with tech 2000 from wally world in the v-4s with no issues. the only engines I am rabid about the yama-lube are the HPDI and ox-66 motors. the 130 is a basic solid design. works well. but you must find the cause of the wet foul or it will carbon up. good luck and keep posting

[dskogman]

I switched to Yamalube a few months ago to see if that would help and it did not. Also checked the fuel pump before and it did not have any leaks. I will try the other recommendations to see if I can figure it out. It looks more like too much fuel than oil but don't know for sure. I'm glad to know it's possible to make the engine idle well since it runs great otherwise. Robnik1The pilot screws are for idle adjustment. There is a linkage that goes from the oil pump over the top of the motor to the throttle that is adjustable. Thanks for the help, I'll let you know what I find out.

[vinney]

I love to see one of those oil pumps. The only time the oil pumps get replaced is when they have 1000 hours or more or they have had a delivery change like the 250 HPDI. Yamaha oil pumps don't go bad. As for wally world your killing me with that one. Yamaha would like to see those oil pumps too. Business owners Vs. Techs. As a business owner I want easy push button fixes and techs want to be the only guy in the country to find that problem. The problem is you make money with the easy stuff and loose your tail with the needle in the hay stack. As an owner I love the easy stuff I dont make a big deal over nothing and I dont think Im smarter than the engineer who designed the stuff. Tech will find every excuse why they can't do the job. We dont need heros and there is no room for superstars. We make money doing service the easy stuff. We service 6 to 10 Yamaha's a day and love the easy stuff (push button fixes). Yamaha's are the easiest engine to work/service. It's funny how some people make big deals over nothing. Big deals dont pay the bills. We might see a couple head scratches a year. Most of the Yamaha service is push button and thats the way I like it and the customer does too.

[rodbolt]

HELLO wow what a post. well yamaha has one of the pumps. they do go bad. I cant help that yall dont service many yammis but here we do. anyway I will stand by what I suggested. I also own the business and I am also the tech. I also contract for several other marinas in the area and yes yamaha stuff fails just like everything else if it did not there would be no yamaha techs. as for not being a tech. it shows. you really should get in the field more often. good luck and keep posting

[vinney]

I bill as much out Billable hours per week as any of my guys. We dont need superstars needle in the hay stack guys never make it on there own. Still like to see one of those oil pumps. Self employment means your 100 percent making your living on your own. Not working for someone days and doing side work at night. Self employed?

[dskogman]

I finally got around to working on the engine again and took the carbs off, cleaned them, reset the floats which were set about a 1/10th inch high measuring from the base to the floats, and resync'd the butterflys. Also rechecked the fuel pump for leaks but no problem there. Also found the max advance stop was set to the specs for a 115 instead of a 130 but that should not affect the idle. Took the boat out today and idled great. I don't know exactly if the problem was the float setting, the carb sync, junk in the carbs or a combination of all three but bottom line is finally idles great. Did not get to try top end but will next time.Thanks for suggestions all, great board!

[whiteman]

DougI troll most of the time with my 2001 115 2S and have had no problems (touching lots o timber!).