Speaking of 'all things Beta', I have a 2019 390 RR-S with a fuel-injection problem that has defied me and one very savvy mechanic who got a lot of help from American Beta to solve the problem. I set the bike up with the same kind of diligence as I have been setting up this bike (now 5 pages deep):
There is a 701 Enduro only thread already: https://advbikes.com/threads/husqvarna-701-enduro-only.263/ I posted tech stuff in that thread and felt as though maybe that wasn't the best place to do so, so I decided to start a more tech-oriented thread. I've been building up bikes since 1970...
advbikes.com
The bike is highly customized to me (many pages on ADVRider before I left that business in protest against their censorship practices). Replicating all the customization on a replacement bike would take months of work and lots of money, so I'd rather just stick with this wonderful machine and find the one little (but frigging irritating) proverbial 'fly in the ointment.'
The problem: Intermittent loss of idle from the the stepper motor suddenly getting a command to drops the air bypass pintle to the seat. This happens on many one throttle closure after hard acceleration in 20. I'm no tech lightweight, but it stumped me, so I took it to a Beta dealer (twice) to a very savvy tech. We go the bike to run incredibly awesome, but that first cause has eluded us. We have tried - we think - everything but replacing the ECU. And there is no throttle body wear.
The bike runs SO awesome, but it has this goofy fault that is like a dead fly in perfume! Powering off the ECU will immediately get rid of the fault, and sometimes continuing to ride will clear it. But when riding technical terrain the sudden hard engine braking is very disturbing.
So I'm asking for feedback. The usual may happen: that advice is given at a lower level of 'have you tried...', but that's OK. Maybe someone else has had the same thing happen and can provide insight. We've changed sensors from off another bike. Electrical connections and grounds are good short of some mystery thing. I do plan the ECU swap, eventually, but the 701 project has thoroughly consumed me since April.