Mystery surge/splutter when riding at constant speed at 5-6k RPM

[ajs310]

Hi all,

Long time lurker, first time caller.

I seem to have a fuel issue with my '95 Yamaha SRV250. When riding at constant speed between ~5-6k RPM, my bike will splutter and surge as if it's running on bad fuel. If I accelerate or decelerate slightly it disappears.

I've pulled the carb apart and given it (and the jets) a good clean and while the issue did seem to improve slightly, it's still clearly there.

Has anyone had a similar issue or have any ideas as to what might be the problem?

Cheers

[Rhys]

Balancing the carbs should do the trick

[Akzle]

starving. Check vacuum shit.

[gammaguy]

Balancing the carbs should do the trick

Except they only have one carb

[ajs310]

Except they only have one carb

SRV250 has a twin carb

[gammaguy]

SRV250 has a twin carb

owner says he cleaned THE carb

maybe he missed one?

[ducatilover]

owner says he cleaned THE carb

maybe he missed one?

I'd assume so.
Check the slide operate well and the diaphragms have no holes
Change out the fuel filter
Check for blocking lines
Clean the tank vent
Check/read the plugs when it splutters do a "plug chop"
Inspect the float needle and seat, replace strainer and o-ring above the seat

A few wee things to start with

[ajs310]

Thanks for the responses. I'll try your suggestions and report back.

PS: Of course I cleaned both carbs ya bastards! lol