Bike has a spark and cleaned out carb will not start, put fuel in plughole would not fire, it just stopped when going on road, charged battery, so it turns over well, checked valve in petrol tank vaccum working ok, fuel getting to carb, good blue spark when plug is removed and put to earth, could it be when plug is installed the spark is to weak, to fire, c.d.i. perhaps, it just stopped, sending me mad thanks any help would be great. bike is a honda sh50 city express cant find this model in the list so am clicking anyone to continue ok.

SOURCE: 1995 honda cbr f3 wont start

I would think about investing in a carb re-build kit.

SOURCE: honda cbr 900 94 wont start

hi m8,, having a head ache i see,, my m8 had one of these,, still has,, and had the same problem, i see u have checked a few things there ,,and convinced they are ok,, then ,check u dont have an air leak in the air box,, and all clips are secure, and that u havent creased the fuel or vacume pipes under the tank,,if all is ok, behind the rear side panel is the aluminium lookin cdi box ,or ignitor, with about 5 or 6 wires connected to it,, u need to get this tested ,, or borrow 1 and try it,, there about 130 quid new, so test it 1st,, this does play up,, and 1 min it runs great,, next day 2 miles up the road itl stutter ,,or stop,, any probs m8,, shout and i will anserw,,cheers

Gino Cussen

• 217 Answers
• Posted on Mar 15, 2009

SOURCE: engine will not start,carbs cleaned, but will not fire, no petrol

Check the carb diaphrams for any tears/pinholes? (They are on the top of the carbs) Have you reconnected the breather from the tank? Is fuel getting past fuel tap? Sometimes the vent in the fuel cap can get blocked with crud and create a vacuum which stops fuel flowing.

SOURCE: honda cbr 600 wont start

try the wires from the coils as when you constantley rub them back and forwards when changing plugs for instance,mine became worn and i cud get the bike to run on 3 cylinders then 4 simply by bending one of the 4 coil wires

ian

SOURCE: 1980 Yamaha XS 400 Special First,

First, you need a good battery. The bike does have electronic ignition. Soak the carbs in denatured alcohol for two hours after removing the float bowls, then clean with spray cleaner. Spray into every large and small hole you can find. Remove the rubber diaphragm from the center of carb prior to cleaning. New diaphragms are $196 each. Check all fuses. Put in new spark plugs, NGK-BP7ES. Clean the air filter. Get a can of spray starter fluid and spray on the air filter. The rubber mounts for the carbs are likely to be a problem once it gets running. It looks like they are still available at Babbitt's, $53 each. If un-carburetored air can get into the joints it will lean the fuel mix and cause uncontrollable high idle.

Before you sink a lot of money into the bike, check for spark. If spark is present, coast the bike down a good sized hill without any spark plugs being installed. Put the bike in 3rd gear as you go downhill then let the clutch out to turn the engine over. Now ( using the clutch lever ), shift through all the gears then neutral. If the bike will not shift properly it likely has a bent shift fork. I can't find any forks avaiable. With a bad tranny I would put it back in the dirt floor building and find a newer bike. Here is a link to Babbitt's. Please rate my answer. Thanks.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

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