Simon
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If its fuel injected then you have almost certainly a bad connection on the feed back from a coil to the ecu, unplug every connection on the main loom &Â spray with contact cleaner 99%this will cure the issue, some of the connectors will be well hidden
As I always say given enough time & money anything is possible, in truth the problem of designing & manufacturing a manifold is the first problem then which carb jets etc only a Dyno will reveal. I think if hyosung could have got away with a single carb they would have as it saves money so to me that says not worth it.
The only issue I can think of with the vacuum type pump is they can foul up/degrade but then they just don’t work so over pressure is not a thing.
That is definitely going to be the front ht lead/ht cap breaking down. Your model should use the same coils as mine which just so happen to be the suzuki ones fitted to the gs500 1989-2008 & the sv650 1999-2002.
I’ve been considering this issue (I own the 250 fi) it’s going to be a process of elimination, first thing the easiest to do is connections unplug & clean all the connections with contact cleaner, there’s several under the tank along side the air box, the fact it’s not throwing any red light says that the ecu thinks everything is OK. Now the sensors regardless of what they do work pretty much on resistance so this controls the the injection time, next is the compression test if that’s OK then a valve check would be next.
They use the same air filter for the 125 250 650 the standard is more than capable of dealing with anything, no benefit from a k&n.
Didn’t realise it was the fi one, a compression test is the first place to start.
Sounds fuel related to me, carbs need ultrasonic cleaning fuel lines, filters checked etc.
That low mileage would indicate to me that it’s had fuel sitting in it for prolonged periods so the carbs are going to be gummed up & in need of cleaning.
The electric pump would be to powerful for carbs it’s designed to run injectors.
Keep them calipers clean lesson learned, I’m going to take a few pictures next time I do it & will post the how to guide.
I have a gt250 fi personally I’d prefer a carb one as they are easier to set up & tune, the fi your pretty much stuck to what it does.
