MyFishFinder Forum
MFF US Northeast => Pennsylvania => Topic started by: Jigwiggler on Mar 13, 2004, 10:05 AM
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Not that you need them yet! I was just wondering who out there has jet boats , what kind and how you set yours up?
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I do :)
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I've got one also.
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What size boats and jets? Where is the foot of your jet in relation to the bottom of your transom? Any jet horror stories? Ever clog your jet so full of weeds that you shear a key. I have, I wouldn't suggest it to anyone.
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16' Basstracker with 40/30 Yamaha boyesen reeds. Most jets if set up right the foot is usually even or a little above bottom of transom. All boats are different. Takes a little experimenting. No horror stories. Love mine. Will clog with leaves in the fall but have never sheared a pin.
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The only way I can see to shear a key is to suck something up while going full speed through shallow water. We did just once. Late summer and the water was real low. Went through a rift at the end of an island, had to make a real sharp turn in order to enter it. When we got to the end I looked ahead and there saw nothing but a solid mass of long weeds. There was no turning back, the rift was to shallow to float back down through. CLOG! What a mess. ::)
You said you installed boyesen reeds? Did you notice much of a difference? Did they change the RPM range of the engine? I don't understand that while liquid cooled 2 strokes in snowmobiles and such will turn 8-10,000 RPM's while outboards are limited to 5-6,000. If you could get into that higher RPM range you would have a lot more top end for covering water. Heck, my air cooled Polaris sled doesn't move until you hit 5 grand and that is a 1973! I don't see why it isn't possible with outboards. My whole point to this is that if you could turn more RPM's for more top end you could get away with a smaller, lighter motor which would in turn allow you to access shallower water.
Jets are an awesome tool to increase your fishing opportunities. I'm just curious to hear some other views and experience. Also something to talk about since there is not alot of posting going on yet ;D.
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14' Roughneck with a 25/18 Evenrude. No horror
stories either. I have had the problem with leaves
in fall, just stop, put in reverse and leaves usually
flush out and then continue on. One thing I have
noticed is that if you slow down in shallow water 3-4"
you can have a harder time getting back up on plane
(you have to build up speed and take it easy and not suck up debris into the intake.) After a time or two of
this happening you learn fast what you can do and not
do. I lopve mine also, its the only way to go on a
shallow river.
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The only way I can see to shear a key is to suck something up while going full speed through shallow water. We did just once. Late summer and the water was real low. Went through a rift at the end of an island, had to make a real sharp turn in order to enter it. When we got to the end I looked ahead and there saw nothing but a solid mass of long weeds. There was no turning back, the rift was to shallow to float back down through. CLOG! What a mess. ::)
You said you installed boyesen reeds? Did you notice much of a difference? Did they change the RPM range of the engine? I don't understand that while liquid cooled 2 strokes in snowmobiles and such will turn 8-10,000 RPM's while outboards are limited to 5-6,000. If you could get into that higher RPM range you would have a lot more top end for covering water. Heck, my air cooled Polaris sled doesn't move until you hit 5 grand and that is a 1973! I don't see why it isn't possible with outboards. My whole point to this is that if you could turn more RPM's for more top end you could get away with a smaller, lighter motor which would in turn allow you to access shallower water.
Jets are an awesome tool to increase your fishing opportunities. I'm just curious to hear some other views and experience. Also something to talk about since there is not alot of posting going on yet ;D.
boyesen reeds??? What are these? If you wouldn't mind.
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They are the intake "valves" on 2 strokes. The boyesen reeds are made from a better, more plyable material. They use them on alot of the racing engines for moto-cross and boat racing etc,etc. Surf the net and you should beable to find them or go to a dealer for the type of motor you have and they can or should be able to steer you in the right direction. They are a little pricey but if they work on outboards like they did on my dirt bike you'll love them. Great improvement on throttle response.
Tight lines,
Steve
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Yeah, what USMC said. ;D I am just curious, I had never heard of anyone installing these on an outboard before.
Riverjet if your out there please update us on your performance gains.
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Yeah no problem I just finnished hand lapping the reed blocks this weekend. You would be surprised how they are not flat from the factory. Roughed them with 320 emery and finished them with 600. Installed the reeds and rev plates which by the way are a two stage reed instead of a single stage like the stock ones. I am now waiting on the rebuild kits for the carbs to come in the mail. They should have been here today but not so far. Once i get these i will rebuild the carbs and reinstall everything and hopefully be able to test this weekend. The yamaha does not require a jet change as some do Just richen the air screws a turn. I have used these reeds in a couple of dirt bikes i used to have and let me tell you they kick ass and take numbers. Will keep you posted on the benefits of these. Hopefully i will test them this weekend and post the results. If they are half as good as the ones i installed in the dirt bikes i will be quite happy for the effort. The web site is http://www.boyesen.com/
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Thanks riverjet!! Definatley keep us posted!! I have been talking with my father (his boat) about trying to squeeze a little more out of his. He said that his Johnson (40 Jet, 60 hp) has adjustable throttle stops on the carbs. They only let the carbs open about half way. There may be an easy gain right there. This motor only turns 5000. The last one he had was a 70 hp and it turned well over 6000. The faster you turn that pump, the more water is pushed, the faster you go. This wouldn't help for acceleration to plane, just top end. Which is what I am looking for since I sometimes travel long distances on the Susqy.
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I just aquired an old 5 hp jet motor recently from another member on this site. The motor was seized, and at first I wasn't sure I could do anything with it. After tearing it apart and cleaning everything I got it running. Now it runs pretty good. Meanwhile my knowledge of 2 strokes is very limited. Untill now I have never actually gotten inside a 2 stroke motor. Are the reeds you speek of, the "flaps" behind the carbuerator going into the crank case that kind of act like a check valve?
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Yes They act as valves do for a four stroke. They should be flat no bends nicks or burning.
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I see. Learn something everyday.
Besides the carb and ignition being faulty would rusty reeds make it run a lilltle choppy.
For the life of me I can't get this motor to smooth out. I've completely cleaned the carb and put a new plug and points in it. The response is terriblle. It takes it a while to go through the rmp range and seeems to be more choppy in the higher rpm's.
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Yes they would definatly effect performance. You did not say how rusted. If just surface rust i would remove them and clean them up with some 600 emery. Do this on a flat surface like a piece of glass. If badly rusted you would have to replace them. You also said the motor was seized. Was it from sitting around or failure while running? You may have cracked the rings when you freed it. If it was seized from sitting around the rings were most likely rusted to the cyl wall. Did you do a compression check? Also point setting is critical to timing in a one cyl. Hope this helps.
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They were rusty around the edges. Went and got some of that fine emery like you said and cleaned them up. Helped the response tremendously. It was still choppy though. Talked to my uncle and he said to put an NGK plug in it and gap it .020. Did that and WOW, that was my whole problem. I bought a new Autolite because Champion no longer makes the required plug for that motor and thats what was in it originally. The Autolite was gapped at .025 so first I tried regapping to .020. Made a difference but it was still a little choppy.
Now with the NGK it will idle down to a putter and purr like a kitten. Higher rpm's it misses very very little. I think that is mostly my high end jet not being adjusted right yet. But I'm happy with it seeing as how it's like around 50 years old and was free.
Thanks for the info and tips Riverjet. Helped my throttle response a lot. Just like a brand new motor. :)
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RiverJet,
Did you get that baby in the water yet?? I have been looking at those reeds myself and am waiting for a performance report before I make a decision. I got out on Sun for a while, no luck though. Still to cold.
Jigwiggler
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Well i got it all back together. But unfortunatley when i was putting the accel rod back on the carbs the center socket broke. Hate plastic parts. I have one on order. I think i found a place that may have one in stock today. Will call tomorrow and see if they can overnight it to me. If so will put it in the water this weekend. and post results. Yeah the rivers a little cold yet but i think i could raise some shad this weekend if i could get out.
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Launched boat today in lambertvile. Ran up to point pleasent and back. Boat ran well. Reeds make the power band smooth thru all speeds. a little more top end but not much. Noticed a definate differance in torque. when running thru a slower stretch of river at a constant speed and going into a riffle where the river runs faster the boat seems to hold the speed better under a load without having to increase throttle to maintain speed. did not notice a major differance in performance. There was a strong current and a pretty stiff north wind that i was traveling against. which made it pretty hard to judge. Would say they make the motor run better and smotther but not a major differance. Total cost was just under $200 with carb kits. I would say if your planning to rebuild your carbs i would also replace the reeds with the boyesens. But would not go thru the trouble just to install the reeds if everything is alright.
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Thanks for the update! My carbs are in good shape since this motor is only 2 yrs. old. I was looking on the boyeson site and reeds for my motor are only about $80.00. So if I have any reason to take the carbs off I may just stick some new reeds in too. I also saw that reeds for my little 15hp were only $30.00. This motor does not transition smoothly from mid RPM's to top end and at the speed I usually like to cruise at is not steady and usually tries to either run faster or slower. Runs great at top end and trolls like a dream, I just find my self running faster than I need to most of the time ( since once on plane I can back off to about 1/3 throttle and still maintain a good speed, 20 mph+) to avoid the surging. Reeds may help this and for $30 I don't see how I could go wrong.
I would definatley like to hear a long term report on how they affected fuel economy and if you notice a difference during the low water season.
Jigwiggler