Dyno run

[Studley Ramrod]

Also less electrickery to go tits up when you use carbs.

 

Regarding the backfire, both my mk1 and mk2a kind of backfired when decellerating and I'm wondering if you're actually getting a proper backfire as in an almighty bang, or just the smaller more frequent farty ones like my bikes did.

 

I believe the air cutoff valves on the carbs are there to help stop backfiring so maybe have a look to see if they're damaged/perforated ?

 

The 3-4000rpm range generally concerns the emulsion tubes and needle height.

 

I dunno if this CV Carb tuning guide might help you.  http://www.factorypro.com/tech/tech_tuni...gines.html