800 jetting trouble with Boyesen RAD reed cage... ?

[lasse]

Hello !



I have put in a new set of Boyesen RAD Reed Cage in my Rotax 800 ( 793 ) .

I was out testing the sled and discovered quickly that the engine is running extremly rich and sluggish up to about 5500 rpm.
And not so crisp when you flipping the trottle lever, even on a stand

Anyone here have some tuning experience with the Boyesen RAD reed cage on the 800 engine ?
and how to get it running right ?


My carb set up :

Fuel screws : 1,0 turns out
Pilot jet : 17,5
Main Jet : 520 N
Needle clip : # 3 ( in the middle )

Riding height : 350 - 800 Meters ( 1150 - 2700 Feet )



Any infomation regarding how to jet the Rotax-800 engine with Boyesen RAD reed cage would be greatly appreciated

HELP !

 

[slyrydr]

Hello !



I have put in a new set of Boyesen RAD Reed Cage in my Rotax 800 ( 793 ) .

I was out testing the sled and discovered quickly that the engine is running extremly rich and sluggish up to about 5500 rpm.
And not so crisp when you flipping the trottle lever, even on a stand

Anyone here have some tuning experience with the Boyesen RAD reed cage on the 800 engine ?
and how to get it running right ?


My carb set up :

Fuel screws : 1,0 turns out
Pilot jet : 17,5
Main Jet : 520 N
Needle clip : # 3 ( in the middle )

Riding height : 350 - 800 Meters ( 1150 - 2700 Feet )



Any infomation regarding how to jet the Rotax-800 engine with Boyesen RAD reed cage would be greatly appreciated

HELP !

with a change in reeds, there frequently is a change in the signal (pressure in the venturi of the carbuerator), this means you will have to adjust the fuel going into the machine by leaning out the fuel....smaller pilot jet, open up the air screw (1/4 turn at a time), changing the fuel screw one eighth turn at a time....the main jet should have no effect at low to mid rpms, it's not likely that changing the clip position will have any effect either....the main thing is to change one thing at a time until you start to get positive effects, and then fine tune

 

[summit800]

reed

what year is your sled??

 

[lasse]

2005 ZX chassi with the non hooded carbs !


HELP !!



.

 

[summit800]

where did you buy the reeds ? I've never seen them list a set for a 800 only a 600??

 

[summit800]

is this a older engine out of a older zx , last year for non hooded carbs was 02 , how does it idle for rpms after its warmed up?

 

[Tackbtch]

2005 ZX chassi with the non hooded carbs !


HELP !!



.

Am I missing something here, 2005 zx. I thought 03.5 the revs started and 04 all doos were revs???? 04 carb and newer have hooded needle jets. Anyway my 02 I went down to 480 mains with my Boysen reeds ,Tryed to drop the pilots but was to lean, went back to 17.5 pilots, it ran good. Dino