21-05-13, 09:17 AM
Little update, which may be of use to others.
I noticed the other night that the bikes engine seemed to be rattling at aroudn 2000-3000 rpm. The rattle got faster with engine speed.
Also noticed the bike exhaust seems to pop and burble a lot more than usual.
Having spent the night googling last night, I came toe the conclusion (a bit like Newton and his apple) that there was a fair chance the partially drilled out bolt may well be the cause.
So before I left for work this morning, I whipped off the EXUP valve again and sealed the half drilled out hole with some firegum. I could see some carbon deposits from where the exhaust was blowing ever so slighltly out of the 1-2mm dia. drilled out hole.
Copper-greased everything again for good measure and reassembled.
I rode it carefully to work (14 miles), not really revving it hard (ie: not over 5-6k) so the firefum would standa a good chance of setting.
Touch wood, that seems to have solved it
I couldn't hear any rattling sounds and there was not the noticeable popping and burbling on overrun either. Who'd have thought such a small hole would make noises like a timing or cam chain rattle?!
Anyway, thought that might be useful information for someone.
I noticed the other night that the bikes engine seemed to be rattling at aroudn 2000-3000 rpm. The rattle got faster with engine speed.
Also noticed the bike exhaust seems to pop and burble a lot more than usual.
Having spent the night googling last night, I came toe the conclusion (a bit like Newton and his apple) that there was a fair chance the partially drilled out bolt may well be the cause.
So before I left for work this morning, I whipped off the EXUP valve again and sealed the half drilled out hole with some firegum. I could see some carbon deposits from where the exhaust was blowing ever so slighltly out of the 1-2mm dia. drilled out hole.
Copper-greased everything again for good measure and reassembled.
I rode it carefully to work (14 miles), not really revving it hard (ie: not over 5-6k) so the firefum would standa a good chance of setting.
Touch wood, that seems to have solved it
I couldn't hear any rattling sounds and there was not the noticeable popping and burbling on overrun either. Who'd have thought such a small hole would make noises like a timing or cam chain rattle?!
Anyway, thought that might be useful information for someone.