Honda H100A not idling (now fixed!)

trisers · Scooby Slapper Joined: 29 Jul 2009 Karma :

Just finished rebuilding the mechanics and got it running tonight...first time for two years!

It starts with just a half-hearted kick with the choke on and sounds really sweet but the idle speed is quite high. When i take it off choke the revs drop gradually to the point where it cuts out.

Opening the throttle a bit will keep it going but if i only catch it when the revs have dropped right down to a normal idle speed then it's reluctant to pick up and rev.

Wondering if maybe the idle jet is blocked? I have cleaned and flushed the tank as there was quite a bit of rust inside, and the carb has been completely stripped and cleaned but maybe a little bit more rust has come through?

Anything else to check that might give these symptoms?

Dr. Quack · Could Be A Chat Bot Joined: 17 Mar 2011 Karma :

Just turn the idle up on the side of the carb, if the revs drop after choke has finished it's because the idle/tick over is too low, if this doesn't work also give the pilot jet in the carb a good clean out.

trisers · Scooby Slapper Joined: 29 Jul 2009 Karma :

If i set the idle speed to a sensible speed it just cuts out, only holding the throttle open to maybe at least a couple of thousand revs will keep it going.

I've tried tweaking the pilot air screw form it's factory setting (1 1/8 turns out) but this seems to make very little difference. Is it possible to clean the pilot jet by removing this screw and blowing into it's hole?

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

take it for a good run, they need warming up for a good 10 mins before any idle adjustment. My H100S is the same but once its nice and warm its tickover nicely

Dr. Quack · Could Be A Chat Bot Joined: 17 Mar 2011 Karma :

Piercee100 · Trackday Trickster Joined: 07 Mar 2011 Karma :

When I got my bike (another h100a) the idle speed was set pretty high, so I turned the idle speed down a quater of a turn. I now find it wont idle for long for the first 10 minutes. I usually start on the choke, put my helmet on, choke off, then full throttle to clear excess oil and get clean running (20 secs) then have to blip the throttle every now and agin while I put my gloves on. She's normally fine by the time I have to stop at the first junction at the bottom of the road.

I would give the jets a good clean through as i've had problems with crap in my tank before where she ran fine with choke on but poor with off- best thing I ever did was fit an inline fuel filter.
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Rides: Honda H100a (Retired), VT500e (Sold), Kawasaki ZX400 (sold), Kawasaki GT550 (Sold), Suzuki Inazuma (Daily), Honda CD185t (Broken), LML Star 2t (Last run edition).

P. · Red Rocket Joined: 14 Feb 2008 Karma :

[quote="Piercee100"]When I got my bike (another h100a) the idle speed was set pretty high, so I turned the idle speed down a quater of a turn. I now find it wont idle for long for the first 10 minutes. I usually start on the choke, put my helmet on, choke off, then full throttle to clear excess oil and get clean running (20 secs) then have to blip the throttle every now and agin while I put my gloves on.

You full throttle a cold 2 stroke...? Are you for real Laughing

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

Piercee100 · Trackday Trickster Joined: 07 Mar 2011 Karma :

Well its the only 2t I've ever had, but yeah it normally idles for a few minutes then I clear it. Sounds like its got a smokers cough and misfires otherwise. I wouldnt say it was full throttle pinned back but a few revs clear it- lasted six months so far Confused

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Rides: Honda H100a (Retired), VT500e (Sold), Kawasaki ZX400 (sold), Kawasaki GT550 (Sold), Suzuki Inazuma (Daily), Honda CD185t (Broken), LML Star 2t (Last run edition).

P. · Red Rocket Joined: 14 Feb 2008 Karma :

trisers · Scooby Slapper Joined: 29 Jul 2009 Karma :

So today i had a little time...took the carb off and stripped it. The float height isn't quite right, the original specs states they should be at 13.5 mm but these sit at 12.5mm. Well, no petrol comes out of the overflow so it's not critical although the mixture might be slightly affected apparently.

However lol...when i eventually located the idle jet by following the moulding of the carb body from the idle mixture screw i held a little bit of hose against it and blew. After nearly going blue in the face (!) i decided yes it must be blocked. I sprayed loads of carb cleaner in and kept trying to blow but no luck so despite the general advice that you shouldn't poke anything in i used just one strand of copper wire from a bit of cable. Just a little pressure on it and i felt something 'give'...another squirt of carb cleaner and a tiny dark lump of crud fell out of the main inlet!

Refitted the carb, gave it some choke, one small kick and it just ran on a smooth low tickover....success!!