Running rough

glennsr77 · L Plate Warrior Joined: 15 Nov 2019 Karma :

Hi - I have a 2000 Aprilia 650 Pegaso cube. Up to a few months ago it was my daily driver but I stopped using it as often as I used a little Honda to get to work. The Pegaso was running sweetly ticking over well and revving smoothly - so no issues. However the bike has been stood for a few weeks with only the occasional startup just to keep the engine running. When I went to start it today it took ages to fire up (i think the carbs were dry) and when it did it only ran on choke dying out when i pushed the choke off. I got it running a little better as it warmed up but doesn't rev smoothly now popping and banging as it is revved up. Anyone any idea what's going on - is it carbs off and clean out? I did notice that my air filter box has a couple of holes where my venom exhaust has touched and melted through the plastic but this must have been like that for ages so I am discounting that. Also has anyone put aftermarket cone type air filters on and taken the original air filter and box out? Any help and advice appreciated -thanks.

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

If it runs on the choke / starter jet and not the pilot jet then it could be partly blocked.
Does it have an in-line filter in between the tap and carb?

glennsr77 · L Plate Warrior Joined: 15 Nov 2019 Karma :

Polarbear · Super Spammer Joined: 24 Feb 2007 Karma :

Carbed bikes do not like being left for long periods with fuel in the carbs. I always drain them out (when I remember Embarassed

) so agree that would be the obvious place to check first.
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Triumph Trophy Launch Edition

glennsr77 · L Plate Warrior Joined: 15 Nov 2019 Karma :

Stripped the carbs off the bike - took the float bowls off and they were quite clean. Blew the jets out and gave everything I could a clean out. The slides were a little gunked up but all clean now. The only problem I got was when I removed the clutch cable the plastic retaining screw that holds it in promptly snapped. A common problem apparently but it means that I either have to source another which is stupidly expensive (about £28) or fabricate a new one out of metal which I now researching how to do. I have as a side note ordered 2 cone air filters to replace the standard cylinder one and am busy doing alterations to the air box. Progress report as it occurs,,,,

Polarbear · Super Spammer Joined: 24 Feb 2007 Karma :

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

""""Blew the jets out and gave everything I could a clean out. """"

Could you see through the jets?

glennsr77 · L Plate Warrior Joined: 15 Nov 2019 Karma :

Managed to fabricate a new metal choke screw out of a metal brake line screw that was the perfect fit and thread - drilled out centre hole to retain the choke cable and slide and works perfectly now - won't break that again. Upon inspection the carb float chambers were clean and the jets clean - the sliders and barrels were a bit oiled up so gave them a good clean. just going to put it back together and see how it runs then consider trying the cone filters.

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

You sound very clever but no answer question!

Hong Kong Phooey · World Chat Champion Joined: 30 Apr 2016 Karma :

If the fuel has been in a few months I'd at least top it off with fresh.
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~~'81 CG125, '97 FZS600~~ : '99 CBR600F4, '09 KTM RC8

glennsr77 · L Plate Warrior Joined: 15 Nov 2019 Karma :

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

If no carb inlet filters then i suggest an in-line fuel filter if possible just in case the tap seal/s are breaking up.

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Keep the air filter standard.

I wouldn't have even bothered pulling the carbs out, just fill it up with fresh fuel and take it for a ride. Fuel is a good carb cleaner.

Sister Sledge · World Chat Champion Joined: 17 Aug 2018 Karma :

Why do you want cone filters?
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CCM 404 DS