Jetting, I've been advised Mr Rex is the man for this question

[marshan162]

I recently bought some WH-22 carbs from this forum. I will be putting these on a 2.0l 150. The only mods are heads cut to an expected 145 ish PSI, dry stacked offshore mid section, and although I don't expect them to make much difference, Boyson single stage glass reeds

My question is. The carbs have come with 084 main jets, is this a good place to start or would you suggest another jet size.

I would just like to add, anyone elses comments are welcome

For the sake of a bit of feedback the carbs came from RHickox, the deal went smoothly with no problems. Thanks http://forums.screamandfly.com/forums/images/icons/icon14.gif

[Capt.Insane-o]

What year 150?

[marshan162]

Not sure on year, serial number is illegible. Only information I can give is 2.0 L block new enough to to have oil pump(disconnected), standard vertical reed front, 2 piece heads with hemi chambers, very large exhaust ports where they meet adapter plate(longer than the ports on the one piece plate I have on it) and single chamber style poppet valve. Can't think of any more clues

Karl

[Capt.Insane-o]

Hmm....You may pick up a little on top end. Most of my 2.0's I do run 76-78 in the mains, but I use the old 2.0 175 carbs. The verticle front half is the kink in the hose there. A switch to a horizontal front half is worth a good bit of power. So you may notice very little benifit. I assume it's on a one piece exhaust adapter? Which is good as the 150 tuner long and restrictive. I would swap out the idle jets from your old carbs to the new, leave the 84 mains in, it will be too rich more than likely, but better that than the alternative. Then work your way down if need be. If the boat is heavier I would stick with the stock carbs as they motor will turn 7k with them and have better low end and mid range pull. I would look to a front half swap too if at all possible. What kind of hull are you running this on?

[marshan162]

The original carbs have a very small bore 25mm 1inch. I think they are WH- 2s. The WH-22s are about 33mm 1.3 inch. I felt the old carbs where holding things back. The boat is very light very narrow, deep V at bow and I would say medium V at the stern. Without motor boat weighs 600 pound. I have a jack plate and low water pickup
I have the choice of using original tuner( very long) or what came with the mid(only about 8/9 inches) I chose thw WH-22s after reading old posts here. From what I picked up WH-20s were all top end performance but the 22s were a good compromise

Karl

[T-REX]

Capt got it purdy much covered...Sounds like ya have tha ole 175, fingerported 2.0(with the BIG exhaust)...Tha 22'z are a good carb for that mota, and U will most likely wind up in tha 74-76 rangefor tha river, and could even git lower, depending on tha weight ov tha bote, geer ratio, and prop used..,.Tha carbs kum wit 46 idle jets, but 52'z will make life a lil easier, and bottom a lot more responsive...U kan use tha .096 vent jets(only in 4 holes) or juss leeve them out, if they are removed already, won't make any noticable differnce...Use ya bleed lines, they cleen up bottom end quite a bit...Oh, and I don't know what tuner U have, but tha ole 200, 2.4 iz tha bess ov all for yo mota(and most others too!!)...

az fer tha vert front, Run it wit tha vert front firss, and then if'in U locate a horz, swap if ya want...I have had sum vert reed mota'z run quite well, and made a front end swap, and lost rpm!!!(this ain't normal, but OB's ain't alwayz normal!)....Juss don't exspect a moocho big gain from a fron swap, kuz sumtimes U will wind up dissapointed...Good luck, REX

[marshan162]

Just checked old carbs are WH-2s . Another thing makes me beleive they are quite restrictive is that they have tiny jets 056" making me think the air speed through the small Venturi must be very fast. In my manual most of the other carbs have jets in the 070-090 range. I even wondered if these carbs where from a 135 motor

[marshan162]

I have what looks like three inlet ports and one exhaust, is that Finger port?. Out of interest where does the finger port name come from.

Thanks for the help chaps

Karl

[Capt.Insane-o]

Rex is right on the front half swap, you can't usually just grab any front half on bolt it on, I have about 30 now to pick from. Making sure the sealing ring surfaces are very close is just as important as the bearing surfaces matching. If the sealing rings don't seal properly you lose primary crankcase compression as it fluffs around in the crankcase. The 2.4 200 tuner is the one you want as well. Good little motors, and the can take a beating.

[Capt.Insane-o]

http://forums.screamandfly.com/forums/showthread.php?t=114966&highlight=finger+port

fifth post down by jphill shows the clearly. Done right on a 2.0 like yours makes for a big big improvement.

[marshan162]

Just measured the tuner 6.5 inches at longest tube. I was not intending to swap front half. Parts are rare in the UK compared to US and I've allways felt it is a gamble getting two different halve to match up perfectlly. I like the 2.0L motors they are simple to repair if things go wrong. Just fancy getting to some where a little over 175HP

[marshan162]

Thanks for the link Cptn', I don't think I have fingerports. I think I can see where the name comes from now aswell. My ports are oval spread equally around the bore its a bit difficult to see at the moment , the motor is on a bench carbs facing up. The dogs bitchin me to take it for a walk right now. take a good look at it later