gixxer_junkie_m

@psr

Another thing ,i don't know whether its possible to side-gap a flush center electrode plug?, or would it help?
I have another plug of the honda unicorn NGK R CPR8EA as i am sure you know the letter 'P' in CPR stands for protruding center electrode,were as CR types have center electrode which sits flush with the plug.
The thing is i am reluctant to use the protruding plugs ,as due to higher compression and pilot jet being lean the carb gets blown off while starting the bike.I mean the carb gets literally blown off the intake manifold with a loud bang!The protruding plugs being hotter can increase this prob further as the carb gets blown off even with the coldest NGK R CR9E plug.
The carb blow out issue has been sorted out by a simple method of keeping the throttle open slightly even as the bike is kick started.

Killer

hmm interesting, dont wish to refute anyones claims here but i'll just speak from my experience. Never had to run a colder plug or side gap or do anything to the plug to fix something or improve performance on any my of my bikes (though i probably would have had a safer setup with a colder plug on my rd350 drag bike setup, that was extreme). I dont know how you can feel the performance gain from side gapping a plug but like i said, i wont refute it, i'm sure it does good. In the old days with 2 strokes plug fouling was common, now with the new 4 strokes that doesnt even happen. My experience says theres way more 'fruitful' ways of improving performance. The hesitation mentioned above shouldnt even be there if the bike is jetted right. I'd tend to agree with gixxer_junkies suspicion, sounds like something wrong in the electrics there (not the plugs). I also dont think the jerking issue has anything to do with the modded setup or compression (unless theres something wrong with ported head). You're not running some super turbo charged nitrous engine to have your spark blown out. I've run in excess of 200psi reliably on my apache on stock plugs and with some pretty extreme riding. Jetted correctly there should be no overheating either. my 2 cents

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psr

Side gapping is done as a DIY on conventional plug irrespective of its centre electrode height,and surface gapped plug is a Manufactured improvement on this. As you said the protruding plug does increase the compression .When you finish reading the subject in the link you will understand the mod better. It is suggested as an alternate way of improving spark kernel propagation . The carb back firing indicates very lean AF ratio, or problem connected with ignition circuit. You will have to up size the idle jet also ,since it is the starting jet ,and continues to feed the AF ratio at higher RPM also. Please stick with colder plug ,as it will avoid detonation .

psr

Thanks for your observation..the side gap mod had been suggested for improving the flame kernel spread ..and not as a solution to Gixxer's problem....or as a master fix to anybody's either.Any change from stock setup will change the operating parameters of the engine, and corresponding changes must be made to make the engine perform reliably. If different engines don't have different temperatures , then different temperature plugs suitable for them need not be made. Higher compression increases the engines operating temperature,and a colder than standard plug is recommended for safe,and reliable operation. When my Lancer gave me 0.5Km to 1 Km per litre more with a NGK BP6ET CONSISTENTLY I presumed it is an improvement and wanted to share it..I want to use every drop of fossil fuel efficiently .

Since you are running a Apache RTR which is supposed to have this surface gap plug you can give a better feedback on its performance in stock and after mods .Judging by your claim that you are running stock plugs even after mods in your RTR running it in excess of 200psi and extreme riding, I think these side gap plugs are also having wider Temperature range..

Zamaan

Someone let me know the model number for a Gpower spark plug for my fz-s and how much would it cost ! I don't wanna get a royal topi by those street vendors in Bangalore who sell this stuff for bikes or let me know a good place where I can buy it for a nice prcie in Bangalore !

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gixxer_junkie_m

Go to the distributors itself.They are amit auto agency ,tank bund road (JC ROAD)Journalist colony bangalore.The link below gives you the options for your bike.

NGK Partfinder for Two Wheelers

psr

Hi gixxer did you get a solution to your problems...was any of my observation of use to you ?
Killer had mentioned that he is using the stock Bosch twin ground electrode in his RTR without any problem...even after enhancing its compression and running it at racing RPM.I guess it must be suitable for your application.

gixxer_junkie_m

Yeah ,sorry for the delay in posting .The thing is i've searched in JC road , at ZEN TVS and a dealership too .It seems like the plug is in short supply.The whole market is flooded by NGK and even the TVS distributor Sri Ganesh is pushing NGK.I had bought the previous side gapped twin electrode from him the last time i mentioned about .But now he's saying its not in supply and i gave away the plug to a friend of mine to use in his apache a year or so ago.
I have placed a order for the bosch twin electrode one along with a 32mm carb and both should arrive in the coming week at the most.So lets see.I have a few things planned once the carb arrives ,i'll be putting a wider dia bend-pipe and get the baffle removed .So the jetting has to be re-done with the new carb and set-up.Then the plug should work well .
Anand

ROCKRZ

sorry for the ot but , which bike are you planning to use this carb into??? is it the pulser 220 carbed version?? if yes then why getting the carb relaced

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gixxer_junkie_m

It's a modified 195cc SUZUKI Fiero.I know 29mm carb should do the job well and it might be better suited than the 32mm carb for city conditions.But i do have other modifications in mind for the future ,hence i went for the 32mm carb.