Carb Syptoms ?

Husaden · Jun 21, 2009

Hi There,

Just a quick one from here,

My biike does no longer do the snap wheelies in 3rd, and hesitates a bit on the throttle. From low revs with fullt throttle it hesitates, closing the throttle just a bit the power is stronger. Hope someone can give me a quick hint on these symptoms, instead of me going over everything.. once again.

Am I Lean / Rich. Needle pos or pilot jet. I have done everything i could on the Pilot screw.

Anders, DK

nsman · Jun 21, 2009

I would check/.change the needle and nozzle in the carb.
Sounds like you are feeling some normal wear to those parts.
It seems rich by what you describe.

Taffy · Jun 21, 2009

perhaps lift the needle one clip.

regards

Taffy

Husaden · Jun 21, 2009

Hello nsman & Taffy.

Now I'm confused again.... One says too rich and one says lift the neddle.. That's 2 excatly different cures isn't it ?

Well, I went out an put my new set of atomizer and needle in the carb, and it made no difference. Still hesitation and still starts first touch on the button. It seems to run a little better with the pilot screw almost in. Lifting the needle is easily done, will try that next but I have been there recently and got it perfect by lowering the needle 2 clips. Over some time it somehow started to hesitate.

Taffy, You once told med to drill the airjets as per doc's.
See this link: http://www.husaberg.org/index.php?name= ... highlight=

But there's not enough info there for me to actually do it ! Have no idea where to drill, and I will have to be VERY sure before going down that road as there will be no turning back !! ???

My setup is as folllows:
New needle & Atomizer
Main 190
Needle Clip 1
Pilot jet 33
Pilot Screw 1 out
Choke 40

If raising the needle does not help, maybe i should try a smaller mainjet ?? as I cannot lower the needle more. ????

What do yous think,

Anders, DK

Taffy · Jun 21, 2009

the Main air jet is dead inline with the atomiser whilst the pilot air jet is the one off to the left. if you follow them by looking at them from underneath you'll see that they connect to the right places. it's like looking at a mole in your garden!

regards

Taffy

Husaden · Jun 21, 2009

hmm Taffy, That didn't help me very much....

Whatabout going smaller on the mainjet....

Im i rigt that drillling (whereever it may be) it should be the very last option. ?? If drilling doesn't help anything I can not return to "normal"!

I'm not going to drile anythin without all other ways tried.

Think I will open a post on driling.

Anders, DK

Taffy · Jun 21, 2009

correct - there is no going back!

i do have a spare carb or two here and i guess one day someone will want a race cam with their old dell orto still on the bike so i guess you do have some kind of fall back!

i'm sorry if it's not helpful but you are there and i am here and i don't have the problem.

regards

Taffy

Husaden · Jun 22, 2009

If i decide to drill it, I hope someone in here can tell me exatly where to drill.. Drilling it is going to lean the mixture ???

Think I will try with a smaller mainjet before the drillbit comes in action !

Taffy, you mention the racecam. Arey you saying that drilling is necessary after putting in the cam you sold us ? (Hi torque cam).

Anders, DK

Taffy · Jun 22, 2009

yes it's the right time to do it. i did this for uno in norway and i guessed at his jetting. with the dell orto's they can be absolutely anywhere! 180-205. a nightmare!

regards

Taffy

Husaden · Jun 25, 2009

I have now ordered a 180 and a 172 main jet to replace my 190. Will see how it reacts to that.
Was on a long ride today and it really only hesitates from low revs, and dosn't lift the front in 3rd like it used to!

Also I am waiting for my ebay-FCR from USA to arrive. Then the jetting "nightmare" starts over again.

So why still bother with the dellorto...... Just because I like playing with this stuff !

One more question though: Could this have to do with the ignition timing. If so, is it most likely too little or to much advanced ??

Anders, DK

HeyJohnnyPark · Jun 29, 2009

Mine back fires or makes a popping noise sometimes when I let off the gas after getting on it hard.

Husaden · Jul 11, 2009

So tried a 180 MJ wirth same symptoms, and figuerd it was time for modifying the Dellorto.

See this link : http://www.husaberg.org/index.php?name= ... ic&p=13863

A helpfull guy showed me where them airbleeds actually are placed, cause I had no idea. And thats on the filter side of the carb, Took off the bellmouth and the main and pilot is right there on the perimeter. They where however already at least the sizes mentioned in link above, so I decided to mod the slide to 4.5 mm arc.

Without changing any jets, I gained a lot of power from this mod, and it wants to lift the frontwheel in 3rd again. Still i wanna **** around with jets and needle to see if it can get even better.

So if youre running a "Taffmaister Hi tourqe" cam and just can't get it right this could be your solution too. I have been very reluctant to doo this as there is no going back after removing material !!!

Too be continued

I might end up not putting on the FCR anyway, tried to stick it in there today when the Dellorto was out, and that is ******* big !!!, and you need at least to remove the exhaust or starter.. Can't even see how it will ever get in there !!!

Anders, DK

Husaden · Sep 4, 2009

Just fininshing this thread... for future readers...

Gave up on the Dellorto, but only because I "accidentlly" bought a FCR off Ebay when the Dellorto was at it's worst. But it ended up as a good carb after the slide mod. Just struggeled a bit with instant hotstart on the button.

And for the record, there IS space for a FCR 41 Mk 2 on the 650. Thats including starter motor and bowl drain straight down !

Thats all,

Anders, DK

Carb Syptoms ?

Help Support Husaberg:

Husaden

nsman

Taffy

Husaden

Taffy

Husaden

Taffy

Husaden

Taffy

Husaden

HeyJohnnyPark

Husaden

Husaden

Similar threads

Register CTA

Recent Discussions

Recent Discussions