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00 610sm jetting help wanted

johnclearysm610

johnclearysm610

Husqvarna
A Class
I have a 00 610sm e start. I put two straight through tailpipes on it and trying to get the jetting right to suit. There is a surge/stutter when trying to hold a steady speed on low throttle and getting some loud popping on decel. I have changed the main jet to 185 which has helped a little with the popping. The carb is a dellorto and is currently running
Jet sizes:
Main= 180 changed to 185
Idle = 50
Start= 50
Atomiser= ab 260
Venturi valve= 300
Needle= k32
Fuel screw=2 turns out

Any advice will be much appreciated, thanks.
 
Popping on decel, is not a jetting issue you've derestricted the exh, raw fuel is touched off by air leak getting into exh thru slip connects.
You need to get a flex jet so you can adj the air fuel mixture, with out it to difficult to make this adjustment.
Your jetting #'s are in the ball park with exception of idle jet (60-65) fuel mixture adjusts the flow of this jet as in fine tune.
The Flex jet is the fuel mixture screw with a flexcable attached to it so you can turn it.
Later George
 
I have all the joints sealed with exhaust paste. The popping does get less and less the more i turn out the mix screw. does the flex jet replace the mix screw? So u recomend changing the idle jet to between 60 and 65? Thanks for your help George.
 
Yes it is the same needle just with a flex shaft with a knob on the end.
There are a lot of aftermarket extended screw on the market but still have to put your hand and fingers in a tight hot environment (burns the crap out of you) then you just say screw it that's close enough.
By turning it out you are letting in more fuel.
Go with a flex jet makes tuning much easier and once you get familier with it you can do it on the fly.
Later George
 
Sorry had major Brain Fart you don't need Flex Jet your fuel screw is just in front of Idle speed screw.
Bike hot very low idle turn in clockwise until it wants to start to stall (to lean), then turn counterclockwise until it wants to start to stall(to rich) then set it in the middle of these two points.
Then set idle speed to your liking .
If it starts to rev when going in on fuel screw back out idle speed to low idle and continue.
Later George
 
Thanks George more or less have done what you said there. Running better now though doesn't like colder mornings and still a slight miss when holding a steady speed around 1/4 throttle.
 
We had a 3000 or so RPM miss o those bikes caused by ignition being between retard and advance at that rpm zone the 2003 /04 CDI box helped a lot but im sure its no longer available.I know on 2006/7 bikes an CR8EIX plug helped this.
 
BILLF said:
Its most noticed at 3-4k rpm crusing light throttle the Iridium plug helps and the box from 03/04 helps alot other than that no known cure,even the 2006/07 carbed bikes did it also a bit.
Click to expand...
That's exactly when it's doing it. Just a wee miss every so often. What's different about the 03/04 box?
 
johnclearysm610 said:
That's exactly when it's doing it. Just a wee miss every so often. What's different about the 03/04 box?
Click to expand...
They some how broadand the advance curve if im putting it correct so its not hunting between retard and advance,right now that stuttuer spot its right between .The 2003/04 box for sure helped but part #800080006 original the new number is 800091967 both no longer available but if your searching the world 967 is the one you want.
 
BILLF said:
They some how broadand the advance curve if im putting it correct so its not hunting between retard and advance,right now that stuttuer spot its right between .The 2003/04 box for sure helped but part #800080006 original the new number is 800091967 both no longer available but if your searching the world 967 is the one you want.
Click to expand...
Cheers. Thanks again.
 
Up-tite said:
Popping on decel, is not a jetting issue you've derestricted the exh, raw fuel is touched off by air leak getting into exh thru slip connects.
You need to get a flex jet so you can adj the air fuel mixture, with out it to difficult to make this adjustment.
Your jetting #'s are in the ball park with exception of idle jet (60-65) fuel mixture adjusts the flow of this jet as in fine tune.
The Flex jet is the fuel mixture screw with a flexcable attached to it so you can turn it.
Later George
Click to expand...
jetting as above and 62 idle jet the bike has a hard time hot starting...the only way it will start is closed throttle and just cranking it.....anybody has any ideas?
 
Check your slide to carb body clearances, either could be worn out.
If it runs good at wfo just ride it there.
Later George
 
Slide and body look good, and yea George, that's what I have been doing :)

But it would be nice to make it hot start easily, as sometimes it just takes took long
 
somesuch said:
Slide and body look good, and yea George, that's what I have been doing :)

But it would be nice to make it hot start easily, as sometimes it just takes took long
Click to expand...


An update on this .... I gave up on the Dellorto because of the difficult hot start and got an FCR41MX from the 2006 Husqvarna TE610. The bike starts, runs, and pulls much better, it is almost perfect. However there is still this little bit of a "surge/stutter when trying to hold a steady speed on low throttle". I am running the ever popular OCEMN needle and the NGK C7E spark plug.
I am very happy overall wit the swap.

NOTE: I had use the heat gun to shape the inside of the gas tank around the right/cable side of the carb for clearance.
 
somesuch said:
An update on this .... I gave up on the Dellorto because of the difficult hot start and got an FCR41MX from the 2006 Husqvarna TE610. The bike starts, runs, and pulls much better, it is almost perfect. However there is still this little bit of a "surge/stutter when trying to hold a steady speed on low throttle". I am running the ever popular OCEMN needle and the NGK C7E spark plug.
I am very happy overall wit the swap.

NOTE: I had use the heat gun to shape the inside of the gas tank around the right/cable side of the carb for clearance.
Click to expand...


Many years later and I still love the FCR41MX. the bike now starts easy hot or cold!
 
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