Wed Sep 21, 2022 9:24 pm

Ossessionato
Joined: 26 Oct 2015
Posts: 3749

 
Ossessionato
Joined: 26 Oct 2015
Posts: 3749

Wed Sep 21, 2022 9:24 pm linkquote
108 wrote:
Removing the main jet makes sure you're always on the rich/safe side when testing the needle and atomiser combo. Stuff won't blow up. Well that's the idea. You'll be super rich at some points, but that's ok.

You won't be testing the end result… but identifying the correct needle.

x2 is 90% certain for a tuned engine. Especially if it's reeds (can't remember what setup you have)
Rotory
Thu Sep 22, 2022 4:31 am

Addicted
PX 200
Joined: 25 May 2016
Posts: 927

 
Addicted
PX 200
Joined: 25 May 2016
Posts: 927

Thu Sep 22, 2022 4:31 am linkquote
Oh lol… you had the info on the first post… and re-reading the thread lol…

Been too long in between posts
Thu Sep 22, 2022 6:04 am

Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
Joined: 14 Jun 2017
Posts: 3434
Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
Joined: 14 Jun 2017
Posts: 3434
Location: London UK
Thu Sep 22, 2022 6:04 am linkquote
whodatschrome wrote:
My x2 needle arrived today in the mail, and it's installed. The clip is located two down from the top.

What does removing the main jet do for me during testing?

Normally I use a B9 plug in all my tuned engines that I ride on the highway, what's the reasoning for using a hotter B8?

I ordered up a Trail Tech tach today. Maybe it will arrive before the weekend? I have a wireless tachometer (that I use for testing my chainsaws). I don't know how accurate it is, but I suppose I could check to see what my RPM is when the timing is at 24 degrees.
Set the timing accurately and jetting will be easier.
If it actually needs a B9 the motor won't last long. B8 is usually plenty.
X2 on clip 2 is a good place to start. First check is the atomiser. With no main jet it's easier to decide which atomiser goes with that needle.
Sat Sep 24, 2022 4:37 pm

Ossessionato
Joined: 26 Oct 2015
Posts: 3749

 
Ossessionato
Joined: 26 Oct 2015
Posts: 3749

Sat Sep 24, 2022 4:37 pm linkquote
Jack221 wrote:
Set the timing accurately and jetting will be easier.
If it actually needs a B9 the motor won't last long. B8 is usually plenty.
X2 on clip 2 is a good place to start. First check is the atomiser. With no main jet it's easier to decide which atomiser goes with that needle.
OK, i got some updates this evening!

First off, I installed a TT tach yesterday afternoon.
I first installed ear muffs, then set the initial timing at 24 degrees @ 3k rpm. While the scooter was on the centerstand, i revved up the throttle to check the timing degrees at a given rpm. Here are my results...
24 degrees @ 3k rpm
22 degrees @ 4k rpm
21 degrees @ 5k rpm
20 degrees @ 6k rpm
17 degrees @ 7k rpm
15 degrees @ 8k rpm
14 degrees @ 9k rpm
engine doesn't rev past about 9.4k rpm and if it does, then it bogs back down to around 6-7k rpm.

- switched to MAP 4 on the v6 CDI.
-30 mil Dellorto.
-300 needle seat.
-x2 needle, clip 2nd down from the top.
-AS 266 atomiser
-55 idle
-main jet currently removed
-B8 plug installed
-SIP ROAD XL Viper Box by Nordspeed

Does this all sound like i'm on the right track so far?


Nope, Trailtech doesn't make a red colored tach anymore. Maybe since KTM recently bought Beta that TT will produce a red tach again?

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