1994 CB500 cleanup

binfieldx · Borekit Bruiser Joined: 28 Mar 2013 Karma :

Hi guys,

after a brief run in with bike thieves (twice now Mad

) I decided with winter coming aswell it was probably best to get a commuter bike rather than keep using the 600RR.

I managed to get an absolute steal with a CB500 for £450. Its got no rust looks really good for its age. It's got 32k miles and had been sat in a garage for the past 5 years. I've bought a load of bits to do a complete service: plugs, oil, filters etc.

Its got a few issues which I'm hoping someone may be able to shed some light on. I feel like they are all carb related. The first one is that it seems to not hold its idle off the choke, but will idle on choke with no problem around 2k RPM. The second issue is it seems to have a misfire but only when riding it around (I noticed after a longer ride on manifold pipe was much hotter than the other one but if its idling both stay the same temperature.) I am hoping the spark plug swap may fix that.

Anyone come across these issues?

ThatDippyTwat · World Chat Champion Joined: 07 Aug 2016 Karma :

Change oil, filters (oil, air, fuel) and plug's. Clean carbs, especially jets.

Until then, it's stabbing in the dark.

Chances are you'll need to change the tyres after standing for 5 years.
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'98 VFR800 (touring) - '12 VFR800 Crosrunner (Commuting) - '01 KDX220 (Big Green Antisocial Machine)

binfieldx · Borekit Bruiser Joined: 28 Mar 2013 Karma :

Been awhile since I've taken a carb apart. Is it worth trying by cleaning it with carb cleaner first before taking it apart? I assume it will need re-sync etc if I take it apart.

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

ThatDippyTwat · World Chat Champion Joined: 07 Aug 2016 Karma :

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

binfieldx · Borekit Bruiser Joined: 28 Mar 2013 Karma :

Appeared to have ballsed up re-fitting the carbs to the bike. Did the classic thing where i've forgotten where the different tubes went into it. Being a complete retard here when I say I can't see where the fuel pipe goes into the carb from the tank, does it go into something else first like a pump or something?

binfieldx · Borekit Bruiser Joined: 28 Mar 2013 Karma :

Ok well i've found where the fuel line went-doh. Cleaned the carb up and the bike turned over on choke it ran for 1minute or so then idled low and stopped, now it cranks but never turns over, any ideas?

Should the fuel tap be vacuum or non vacuum? if I open the tap when the tanks off the bike no fuel comes out of it. I'm not sure fuel is getting to the carb cause if I put it all on and take the fuel hose off after crank it looks dry, no fuel in it

binfieldx · Borekit Bruiser Joined: 28 Mar 2013 Karma :

ok so it is vacuumed, connected the fuel line and thevacuum one from the tank and its pulling fuel into the carbs now (confirmed by leaking the bowls) problem now is it doesn't turn over on/off choke. sounds like it wants to and smells like it but never cranks.

Edit-

I've just purchased new plugs and swapped them out. The old two i removed, one side was dark brown/wet and the other side was just wet. replaced with 2 brand new ones both confirmed sparking fine beforehand with the caps. Still doesn't crank, took the new plugs out one was brown and wet and the other one still looked normal nothing on it...Any ideas?

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Did you put fresh fuel in it?

Have you put the plug caps back on the right way round.

Is the kill switch on?
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.