SWM jetting

[Twinshockwobbler]

Hi all. Right I’m going to throw a grenade in here on this subject. Stock jetting is pilot 60, main 90 X2 needle and 70 slide, this we all mainly know. Right here comes the grenade. I’m running 52 pilot and 85 main to get my plug looking anything like how it should, I’ve gone right through the carb, float needle, float height, new needle, new atomiser, new choke plunger. On stock jetting the bike simply over fuels and the consumption is quite high. We’ve had this problem with another SWM and also a TX311 and in both cases the problem is solved by leaning the jetting. All the bikes pick up a lot better and do rev out ok. A 70 slide is lean and I believe by using a 60/90 set up and in some cases 65/95 we are mistaking poor pick up and rev out on under fuelling when in fact it’s possibly the opposite. 
All bikes from new tend to be jetted a bit on the rich side to prevent nip ups and warranty claims but I feel you’ve got to really experiment in this area and especially so with a trials bike. I’m not saying my set up will work on your bike but a little tweeking can reap rewards. I now find the pilot /needle circuit to be quite precise and you don’t have to clear the engines throat due to over fuelling. should add were 200-600m above sea level.Let the abuse begin 😂
 

 

 

 

 

 

 

 

 

 

Edited 2 hours ago by Twinshockwobbler
Correction