Throttle cable or blown engine?

Jammy-G · Banned Joined: 17 Mar 2004 Karma :

Since my crash, my bike is running strange..

It starts with some throttle, and is really unresponsive under 4k, then it flies up in revvs idle, when riding it, it splutters under 4k and after that its totally normal, acts how it should do.

When the bike was on the floor, the back wheel was in the air and the throttle cable stuck out, so it was revving really high for about 3-5 seconds.

Could the engine have blown? Or could it be a problem with the throttle cable? I managed to ride the bike home after the accident, but under 4k, it is really unresponsive - twist throttle when its about to die and a second later the revvs raise quickly, then splutters and dies.

Any ideas?

(Also posted in my crash thread in general chat).
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RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

Kram · World Chat Champion Joined: 20 Oct 2004 Karma :

this could possibly be a kink in the throttle cable, have you straightened the cable again?, and does the engine tick over normally. as you may have knocked the carb(s) a bit. it might just need a bit of a gentle knock;)
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FS1E -> SR125 -> CB400N -> CB650 -> FZR600 Genises -> VFR400 NC21 -> CBR900RR Fireblade -> Renault Clio 1.4

loply · World Chat Champion Joined: 24 Mar 2004 Karma :

Air leak?

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Would expect a throttle cable being damaged could be felt, and should not affect throttle response (just how hard you have to pull the throttle).

Possible you have damaged the engine. Electrics often either work or don't. I would hope that it would be carb related. Might be worth taking the carb off and apart and checking it out to make sure nothing is dislodged.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Jammy-G · Banned Joined: 17 Mar 2004 Karma :

Just took out the carb and given it a good clean. When cleaning it out I noticed something rattling in the float chamber, is this right? (Sorry if this sounds dumb, I don't know much about the carbs).

Going to bleed the oil and check throttle cable next, if it still has the problem, anyone know what it could be?

Cheers.
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RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

Jammy-G · Banned Joined: 17 Mar 2004 Karma :

Ok this is what happens.

When I start it on choke the revs shoot up to 5k.. stay there for about 30 seconds and thne slowly fall down to about 4k and idles.

When I turn choke off the bike begins to die. I can save it by appliying a little bit of throttle, but when I do the revs rocket up and then slowly fall again, and then begin to die yet again.

Before my accident i never used the choke at all.

Any ideas on what it could be?

Cheers.
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RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

The floats move in the float chamber. They should not really rattle although you should hear them move. Also the bits you need to clean out are the jets and they are got to by taking off the float chamber (single 14mm headed bolt).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Jammy-G · Banned Joined: 17 Mar 2004 Karma :

I put it all back together and took the bike out for a spin.

With the choke out a tiny bit, the bike runs as normal, wen riding if if push the choke in it runs fiine, but when i come to a junction and pull the clutch in the revs raise and then the bike dies, exactly the same as what happens when it's running out of fuel ! So I'm guessing the idle jet needs to be opened up a half turn or something?

Which is the idle jet? I was looking through my haynes and found the pilot jet, main jet and another one.

Would it be this do you think? The bike runs great, it just does this when it comes to idle.
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RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

The pilot jet is on the side of the carb, either towards the front or back depending on if it is a air screw or mixture screw.

https://www.bikechatforums.com/viewtopic.php?t=17124

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Jammy-G · Banned Joined: 17 Mar 2004 Karma :

Jammy-G · Banned Joined: 17 Mar 2004 Karma :

Taken it on a couple of runs, seems to have sorted itself out. Now idles with choke in anyway. I'm guessing there was a bit of dirt that has cleared.. anyhow, I'm a happy bunny !!
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RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours