Dell Orto PHM 41 ?

FirstEliminator · Oct 7, 2005

I found a guy that is selling Dellorto PHM 41's. My 98 Husaberg FE501e has a PHM 40. Would this 41 work? Would it be better? Would it physically mount in position? My current phm 40 is worn on the body where the slide goes. I think it would be best to replace it.

thanks in advance,

Taffy · Oct 7, 2005

the carb may be in better condition than yours but you should remember that the very slide that wore out your carb has even less surface area to grip it in your next carb!!!!

if i ever saw a case of leave well alone-this was it!

regards

Taffy

husabutt · Oct 7, 2005

If he's selling them cheap I would be inclined to give it a try. I would transfer all your old jets to start the jetting process. You may have to go slightly larger on all the jets but maybe not

Make sure a new slide comes with the carb and the slide cutaway is the same.

Does this carb peddler have a website?

FirstEliminator · Oct 7, 2005

The carb is brand new in the box--complete. Looking at another DellOrto website, The mounting portions of the carb are the same between the 38-40 and 41. The only thing I am concerned with about this particular carb is if the idle adjustments are on the correct side. The Dell site had listed they they were availible for either left or right side idle adjustments. The carbs are on E-bay, and he currently has 5 for sale with a buy-it-now for $160 each. I have come to the conclusion that my bike is in need of a complete overhaul. I would like to top it off with a new carb. If you guys think this is a good idea and decide to buy, please leave one for me...eh?

FirstEliminator · Oct 7, 2005

Well, I just looked at the PHM41 again. I think the idle adjustment is on the wrong side. These carbs look like they have right side idle adjustments. I wrote to the seller for more info, we'll see what he says.

Taffy · Oct 7, 2005

right side adjustment is what you want surely?

regards

Taffy

FirstEliminator · Oct 8, 2005

No, I certainly wouldn't want right side adjutment. These are definitely right side---wrong for the Berg. Maybe that is why they are cheap.

dsducati · Oct 8, 2005

When Barry at Premier Motorsports in Phoenix was hot into Husabergs he was swapping all the round slides for the 2 stroke style flat slides. He claims better throttle response, but I found them too sensitive to altitude and Humidity changes. Anyway, he always has had round slides laying around off of practically new bikes because of this. I swapped him the 40 round slide off my 501 for a 38 round slide to help the slow speed driveability (helped a lot), and he had both sizes in stock back then. 623 582 1350
Dan

FirstEliminator · Oct 10, 2005

Well, I just bought two carbs from E-bay. They are both used and both claimed to have been on running bikes---not sure if it was a good running bike. Anyway, one is a PHM40 from a 98 FC501 and the other is a PHM38 from a 96 FC501. They were both reasonably cheap enough to buy both. Now I can try Dan's recomendation of the 38. I also bought a manifold that was listed for use with the 38 also from the 96 FC501. Is it known if this manifold will bolt on to the 98 FE501? Do I even need to change the manifold if going from the 40 to the 38? What I said eariler in this post about the mounting points on the PHM's being the same diameters, I seem to have found some conflicting info.
Dan, what would you recomend for jetting in the 38 when used on the FE501?
Now I have 3 carbs to try, if they all act the same, or only marginally better, then I will know for sure I have other troubles.

dsducati · Oct 10, 2005

A 96 501 had a 40 round slide stock. Not sure where your 38 came from, guess it doesn't really matter. Think the older 499 used a 38. I'm at 300 feet altitude. Really taxing my memory here to remember the jetting in that 38. I only found in my notes that I changed the main to a 175. I am pretty sure I raised the needle so only one more groove is left to raise it any more and decreased the pilot to a 40. Larger 501 was pulling some fuel through the pilot orifice and idle mixture screw had to be almost completely in for the engine to idle til reducing pilot size. (Pretty sure it came with a 45) Raised the needle to get the throttle response back. Idle mixture screw is out 1.5 turns now. Am assuming everything else was ok as is, whatever that was. Probably a K51 needle and 268 needle jet. My carb came off of a 98 400. If you could find stock 98 400 specs from a dealer, you could fill in the blanks for sure. Sorry I didn't keep better records.
Dan

PS Your stock manifold will work fine with the 38

LINEAWEAVER · Oct 10, 2005

Hi FirstEliminator,
Sorry I missed your IM.

The 38 was used on 499, very early 501, 350 and 400 engines.

The inlet manifolds are all the same.

Properly tuned the 41 will out perform the 38 everywhere.

I have no specifications for the 38 as I always sold them off.

I do have a 40 modification / upgrade which requires one to forward the carburetor. Said upgrade is $150.00 plus parts, S/H and I.

For more information I may be reached @:
510 223-9052
[email protected]

Hope this helps.
Sincerely,
Dale

wildbill · Oct 11, 2005

If you check the intake on a 38mm you will see 2 grooves inside the boot, on a intake for a 40mm you will see one big groove. That allows the carb to mount closer. Right now I have a VHSB 38mm on my bike but also have a PHM 40mm with intake to put on. A good idea would be to check the jet sizes and write them down. That way you will have a idea on what to do. Good luck.

Chas · Oct 11, 2005

The stock carb, at least on '95 and '96 501's and 600's, was the 38mm flatslide oval bore Dellorto. A few folks, notably Bill Woolman and others, replaced the flatslide 38mm oval bore with the round slide 40mm round bore with better results. The factory soon followed suit thereafter.

P.S. On my '96 FE600e, I was never able to attain perfect jetting with the stock flatslide 38mm and finally replaced it with a flatslide Mikuni 40mm carb which performed 100% better and was easier to jet properly. The only drawback to the Mikuni carb was a slight tendency for the slide to sometimes return to idle rather slowly due I believe to engine vacuum working against the closing slide.

dsducati · Oct 12, 2005

Would agree with you Dale that overall power, especially in the mid and upper end was better with the 40. But in 5 mph rock bashing (where a Fantic motor would work best

) the 38 ran better off the bottom.
dan

LINEAWEAVER · Oct 12, 2005

dsducati said:
Would agree with you Dale that overall power, especially in the mid and upper end was better with the 40. But in 5 mph rock bashing (where a Fantic motor would work best ) the 38 ran better off the bottom.
dan

Hi Dan,
The modified 40 vs an average 38 has the 40 better everywhere including both idle and transient conditions. Being fair, I never put any effort into the 38. I am of the school that a variable Venturi carburetor is only as big as your appetite. (ie one must learn to exercise a bit of throttle control)

Sincerely,
Dale

dsducati · Oct 13, 2005

Thats probably the problem. Too often I'm out of control.

dan

LINEAWEAVER · Oct 13, 2005

dsducati said:
Thats probably the problem. Too often I'm out of control.
dan

Honesty and the ability to laugh @ oneself.
Such a unique quality in this day and age.
Always a pleasure Dan.

Sincerely,
Dale

Dell Orto PHM 41 ?

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