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 Post subject:
PostPosted: Sat Jul 24, 2004 10:04 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
I have seen and used diapham carbs in the past but know nothing about them..


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 Post subject:
PostPosted: Sat Jul 24, 2004 10:16 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
instead of a float these carbs have a springloaded needle and seat. the "pop off" pressure is addjusted by changing springs. the jets are easy to access. and there is a high and low adjustment screw. i will look for my tuning guide. it is preety easy to understand.
here is a drawing of the typical mikuni pwc carb.


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PostPosted: Mon Jul 26, 2004 2:46 pm 
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Joined: Fri Jan 23, 2004 12:23 am
Posts: 240
Location: Florida
Hey Bigpeterhead - Who Makes / made Aftermarket Pipes for that Engine Hoser has there?


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 Post subject:
PostPosted: Mon Jul 26, 2004 5:11 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
i am not sure on the pipe thing for sleds. i am sure there are many. my exposure to rotax engines is from personal watercraft. i think hoser stated that he has the pipes that were made for his Engine, and thus the interest in the watercraft carb to allow the room to use them.

pete


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 Post subject:
PostPosted: Sat Jul 31, 2004 4:10 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Here are some pics of the manifold and carb there are no numbers on the
carb other than the Mikuni the bore on the manifold side measures 1.530
or 38mm?


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 Post subject:
PostPosted: Sat Jul 31, 2004 4:11 pm 
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Location: Chicago
With the carb off


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 Post subject:
PostPosted: Sat Jul 31, 2004 4:12 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
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Location: Chicago
Engine with no manifold


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 Post subject:
PostPosted: Sat Jul 31, 2004 4:18 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
With watercraft manifold on

From GroupK site http://www.groupk.com/tec-carbs97.htm

Dual carbs - Racing has certainly popularized dual carburetors. However having dual carbs is not necessarily the passport to big time horsepower. Dual carbs usually require a little more maintenance and on going adjustment. If putting up with that is not your cut of tea, you'll probably get all the performance you need, along with all the simplicity you want, from a good aftermarket single carb upgrade kit. If you've decided that aftermarket "duals" are for you, the pop off pressure between them should not vary more than one psi. Of equal importance, before doing any fine tuning, visually confirm that both throttle butterflies are closing completely and opening at the same instant. When setting the mixture screws, the settings should always be kept identical between the two carbs unless otherwise specified by the carb kit maker or your Engine builder.


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 Post subject:
PostPosted: Wed Aug 04, 2004 9:11 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
bigpeterhead how much they charge for them air filter adapters ?

Any tips on taking this carb apart for inspection or should I try to run it first?
Never been inside one before I figure the fuel pump cant be hard I have
done them before....


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 Post subject:
PostPosted: Thu Aug 05, 2004 4:01 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
let me check and see if i have an extra adapter around. i beleive that you have a 38 super bn carb. does it have three holes for the adapter. i do not work this week end, i will look for my tuning guide. there is not a lot inside to clean. needle and seat may gum up, and it wouldn't hurt to spray out the body with carb cleaner. the drawing i posted came from sudco's site. it was rather large. it can be helpful. i will post more later this eve.

here is a link to an adapter

http://cgi.ebay.com/ebaymotors/ws/eBayI ... AMEWA%3AIT


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 Post subject:
PostPosted: Thu Aug 05, 2004 4:09 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Yeah my carb is 38mm and it has 3 holes, I will look around the shop I probably have
a piece of aluminum big enough to make my own adapter ....


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 Post subject:
PostPosted: Thu Aug 05, 2004 8:37 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
hoser

email me at bigpeterhead@aol.com and i will send you the mikuni tuning manual in pdf format, along with the exploded drawing. also look at this site http://www.groupk.com/tec-carbs97.htm.
it is what the klemm brothers do now, after klemm research.

as far as a carb adapter goes, making it should be a simple task. if you look at the photos i posted of them, i like the adapter that is two parts, as there is no chance for a screw to be injested into the carb. most of these adapters act somewhat as a velocity stack, too.

things are starting to look good.

pete


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 Post subject:
PostPosted: Sat Aug 07, 2004 7:06 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Thanks for the stuff you sent by email soon as I get this thing running I have no doubt that
info will be my next new bible heh

Here is my filter adapter not as fancy smancy but it will do until I can figure out a air
box and pre filter setup.believe it or not using a paper templet I got off the carb I
was able to center punch and drill the holes on the aluminum with in .010 of being center.

The stock water outlet came straight back on the sled setup I fabricated a new thermostat
housing with a fitting on top to provide clearance for the filter. don't need no stinking CNC
machine jut a hack saw and a drill.....


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 Post subject:
PostPosted: Sat Aug 07, 2004 7:51 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
looks great. i agree that a lot can be done with a bit of care. a popular mod for these carbs is to get rid of the choke and use a primer pump to clean up the flow. somrthing to consider down the line.


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 Post subject:
PostPosted: Sat Aug 07, 2004 9:08 pm 
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Joined: Fri Jan 23, 2004 12:23 am
Posts: 240
Location: Florida
Does that Engine take A/C Delco spark plugs or are they just there to fill the holes for now?


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 Post subject:
PostPosted: Sat Aug 07, 2004 9:14 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Yeah the AC plugs were just to fill the hole while the Engine was in storage
I got 2 pairs of B9ES plugs with them two parts engines I bought I will use them
until I see exactly what heat range this Engine will require.

That is a before picture of the new thermostat cover


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 Post subject: Water outlet
PostPosted: Sat Aug 07, 2004 11:06 pm 
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Joined: Wed Dec 24, 2003 12:06 pm
Posts: 1418
Location: San Diego
Nice job!

You could've left it going straight and fit it with a finned billet pipe going through your intake with rubber grommets on the ends to seal the penetrations.....

Looks good, you're going to have to clean up all those rusty nuts and bolts so you can show off your work.


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 Post subject:
PostPosted: Mon Mar 07, 2005 10:23 am 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
bigpeterhead, you know anything about troubleshooting or tuning the BN 38mm?
Problem I am having is erratic low speed idle operation/performance, sometimes
it works great then sometimes it seems like it is trying to flood the Engine, med
to hi RPM seems ok, before I spend money on a rebuild kit or jets you have any
ideas, the carb is clean inside, the needle and seat look new and show no signs
of wear, I have not checked the pop off pressure, I generally don't spend much
time at idle so long as it idles and don't hesitate when I accelerate I don't care
how spot on or exact it is, the problem seems to come and go if that helps...


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 Post subject:
PostPosted: Mon Mar 07, 2005 7:32 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
hoser

sounds as if the pop-off is the problem. the vibration will cause the needle to vibrate in the seat letting fuel bypass. if you can see into the carb with the Engine at idle, you may be able to see fuel running down the side of the throat. this would confirm it is the pop off. here are a couple of links to harry klemm's site.

http://www.groupk.com/carbtune98.html

http://www.groupk.com/carbtune.html

hope this helps. if not i will check with my buddy the watercraft tech, who isvery experience with the 580 that the carb camem from. good luck.

pete


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 Post subject:
PostPosted: Tue Mar 08, 2005 8:28 am 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
I was thinking the same thing, "dribbler" I think they call it, who knows what I did by installing
this Engine into this chassis I have no doubt it changed its normal resonate frequency and
the whole way it vibrates, I cant hurt anything by bending the arm or stretching the spring
at this point can I ?


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 Post subject:
PostPosted: Wed Mar 09, 2005 8:29 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
i don't know about bending tne arm. i can't see what harm stretching the spring coild hurt. the springs are available in different weights, and are not very expensive. performance carbs for seadoo watercraft usually are converted to a rubber spigot mount to help isolate vibration. is your Engine rubber mounted?


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 Post subject:
PostPosted: Wed Mar 09, 2005 8:47 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Yeah its rubber mounted but I don't know how it compairs to one mounted in the
watercraft, I used the Honda rubber mounts...


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 Post subject:
PostPosted: Fri Mar 11, 2005 3:15 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
Update: since I fixed the ignition problem it runs perfect again maybe the
whole problem was the igniton, took 10 hot laps around the track in the
back yard and down the hard road WOT (Wide Open Throttle) for about a mile, all seems ok,
guess I will find out when I get to LS


http://pilotodyssey.com/PO/viewtopic.php?t=1164


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 Post subject:
PostPosted: Mon Jul 04, 2005 10:42 pm 
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Joined: Mon Dec 15, 2003 2:40 pm
Posts: 22512
Location: Chicago
bigpeterhead, I am ready to do that choke mod, where is the best place to
get the primer thing I need, I assume you remove the choke plate and
shafts then fill the holes where the choke rod was?


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 Post subject:
PostPosted: Wed Jul 06, 2005 4:48 pm 
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Joined: Thu Jul 15, 2004 6:03 pm
Posts: 33
Location: nw ohio
hoser

was away from computer access over the weekend. have just seen your post. here is what you are looking for.

http://cgi.ebay.com/ebaymotors/ws/eBayI ... &category=
50439&item=4560570093&rd=1&ssPageName=WDVW

most powersport dealers that have performance goodies for watercraft will have them. i will check and see if i have anything in the boxes of junk that i have. what are you looking for, more airflow, or ease of starting. let me know. i am real interested.

pete


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