Hi all
New here, and really hoping someone can point a new biker in the right direction! I have a 1992 SR125, which I bought just a couple of weeks ago after passing my CBT last month. I've done a few ride outs, and on Sunday, rode it 65 miles from my girlfriend's to my dad's place with no problems. On Monday I fuelled up, and within about half a mile it started to lose power. It felt like driving a car with the handbrake being applied. Every now and then full power kicks back in (a little worrying, as at times I can have the throttle fully open and barely be holding 40mph, then suddenly it jumps to life again!). Last time I fuelled up - immediately before the problem started - I used high octane unleaded. Thinking back I'm sure I read somewhere that old engines are tuned to use the newer fuel and wondered if this may be part of the prob? The only other advice that I've had is that it may be a hairline crack somewhere that opens up as the engine warms up (another ride this evening does suggest that it runs fine for the first couple of miles, then starts losing power).
If anyone can shed any light, it'd be much appreciated
Many thanks from a total beginner!!!
Pete