Great looking Hawk, Gordon. Glad you got it mostly sorted. Let us know how the fine tuning turns out.
Claude
Plugs Fouling
Plugs FoulingHi , The Carbi: is fitted with 35 Main Jet & 100 high speed jets, I just got a email from Mr Honda Bill Silver, he asked me to lift the needle to rectify the surging, I will give it a go, Cheers, Gordon.
Nobody has touched on this so I thought I would in the spirit of having well informed members.
Plug heat range has to do with the ability of the plug to reject heat under operation. A hotter plug holds more heat than a colder plug. It is important for both the life of the plug and the ability of the plug to burn off deposits that accumulate. A hotter plug will also assist in helping the engine to fire. But too hot a plug can lead to pre-ignition which is a bad thing. Think of the heat range of a plug as it's ability to glow red increasing and decreasing with heat range. The heat range of the plug will not cause you to hole a piston unless you choose a range that is so hot that the engine pre-ignites, which means it fires in advance of the spark being generated. This can generate some high temps and stresses in the engine. Your plug turning black was from excess fuel which makes for incomplete combustion. The process produces excess carbon and that deposits onto the plug. A hotter plug could help with this, but normally a hotter plug is used when the carbon fouling is from oil burning, which is a gooey type of carbon that will burn and then flake off. The carbon in either case is conductive and will short out the plug so that it no longer fires at the electrode gap. It creates a complete circuit between the electrodes so no need for it to spark and conduct to ground. You plugs are not "burned up". They are simply fouled with carbon. If it makes you feel any better, you are not the first person to swap the slides and won't be the last. I know better and years ago had the slides in backwards on a Guzzi with square slide Dellorto's. Got so mad that it would not run that I pushed it into the shop and left it there for a year. Following spring I pulled it out, yanked out the slides to make sure all was well and could not believe my eyes. Bike ran like a raped ape after turning them around. We all have several Homer Simpson moments in us. When they will appear is anyone's guess. regards, Rob
Plugs FoulingHi Rob,
What I cant seem to understand is how the Bike ran for two months,it used to miss a bit but I thought it was due to these Carbis: being cold, then it started burning plugs, till I swapped the slides over. Thanks for your informative article. Regards, Gordon The slides being in backwards caused you to have a slightly rich mixture. Too rich a mixture will allow the engine to run, but it will miss or what is called 8 cycle because it cannot fire the overly rich mixture. When it does fire, it produces excess carbon which fouled your plugs and eventually they stopped working. New plugs simply restart the process.
When the slides are backwards, the throat of the carb is more restricted from an airflow POV. Hence for the given jetting, you are getting less air. Putting the slides in backwards is similar to operating with the choke partially closed. A cold engine will run with the choke partially closed and some of these engines actually need the choke partially closed when cold. regards, Rob
Carbs FoulingHi Rob, I installed the Slides in the carbi:according to Mr Bill Silver, The Bike is almost perfect now.What I cant seem to understand how the bike ran for two months before it started fouling the plugs, any answers.
At the moment I have 40 & 100 jets in the carbi: The needles cir-clips are at the second cut from the top of the needle, Eg:running lean. The only problem I have now is the Bike backfires a bit, I did not have this problem before, when the slides were in the wrong way. The right hand plug is running lean,a bit whitish, an the left plug looks normal, gray in colour. I am going to move the clip one cut down to the middle, (hope this stops the backfiring) to make it run richer, I tried the fourth cut from the top with no success.What will be your diagnosis of the problem? Thanks Guys for all the advise from USA, much appreciated.Been to the States a couple of times, really enjoyed the food over there. Regards, Gordon.
Last edited by gordonkreltsz on Sat Aug 02, 2014 8:27 pm, edited 1 time in total.
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