Yeah, the surging is resolved
. I still have pretty regular backfiring, nothing serious though.
I knew about the idle mix screw but kind of forgot about it once I got onto the spacer and main jet.
At the minute I'm on 52.5/152.5 with a 50% spacer. I finally found some stainless steel washers that fit nicely - 6 of them equal the height of the spacer. I'm using 3. I've turned the idle mix screw out close to 2 turns.
I had a hell of a time troubleshooting the tuning due to a leaking vac line on the petcock, and admittedly I didn't realise how important it was to wear gloves and clean up really carefully with carb cleaner when handling the inner parts of the carb (newbie mistake).
I only ditched that white tube today and all went well. It really does open up the top end of the throttle, as you can imagine. Puts a smile on your face.
Once I cleaned the carb (I flushed whatever I could reach with spray carb cleaner) and replaced the petcock, the tuning came together in line with what I've been reading on this forum.
In a couple of days I may try out a 55 pilot just to see if it stops the backfiring, but I'm not too concerned about it. The bike is running great.
Keep in mind I'm also using this as a learning exercise so I'm happy to keep going until I prove to myself there's no further to go
eau de sauvage wrote on 02/08/17 at 05:23:39:@IslandRoad, thanks for the photos, I'll definitely be removing the tube if I find one. I assumed that you would already be aware of the pilot mix screw turnout. Anyhoo, are you saying the surging is now solved? And what pilot jet size and how many turns out have you settled on. I'll have the dyna in mid next week.