Weird RPM issue after service - Video embedded

satanicguardian

satanicguardian

satanicguardian

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Joined
20 Aug 2007
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Solihull
Hi guys,

Odd issue with my bike after service (no chinese bike jokes please! It's just hit 15000km and was fine before the service haha!)

I know the video is a bit wobbly (my cam is mounted on my bag strap temporarily) and it is a bit dark, but watch the rev counter bottom left, riding along in 4th gear about 50mph and for no reason the rev counter will fly up to 13000rpm and the bike will start spluttering (as if I'm riding with the choke full open and fuel mix is far too rich) and I won't be able to accelerate at all until I either change up or release the throttle. This happens in all gears and is inconsistent, sometimes it won't happen and sometimes it will!

I'm taking it back in to the garage tomorrow, I spoke with them after I got home and noticed the issue - they reckon it's cause I'm using different ratio sprockets to the ones I had before (but came as a kit for this bike specifically).

To me it feels like it's more like the rev limiter or something weird going on with the carbs!

Anyone got any ideas? Thanks!

 
It was a full service (oil, jets, new chain and sprockets, all filters etc).

I haven't actually checked anything myself yet as it's going back in tomorrow morning.

The actual revs don't rise at all, they are maxing at 13k rpm but they are actually about 5-6k rpm from what I recognise as normal!
 
Erm I think the front one was different, can't remember if it was more or less teeth, they said I should get slightly less acceleration but a bit more top end, it seems I have neither and a misbehaving bike haha!
 
TallPaul_S said:
if the rev counter is showing as redline when it's actually doing 5k rpm, then unless it's a cable driven speedo/rev guage it's electrical. Which would point to an electrical issue.
Click to expand...

Hmm, it could be cable driven, it's fairly cheap bike remember - I've never taken the speedo apart on it (yet!)

If I'm anything like the way I am with technology it's bound to get taken apart haha
 
I don't think it's going to be the sprockets, if it was mechanical like that the fault would be consistent surely? Makes me think it's the carbs or something

Tallpaul, it's definitely carbs, none of that fancy fuel injection stuff on my chinese bike haha
 
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