So I opened the plugs of my bike for the first time and found that there were two different kinds of plug, i.e. two plugs NGK C7HSA and two Bosch RO768 My bike is a 3ln model and I was suggested CR8E plugs. Now I am wondering which plugs I should buy??? Also it is strange that the cold starting has got worse after cleaning the plugs. I am wondering if over tightened the plugs, could that be a reason? I only cleaned the plugs and changed the engine oil, but starting problem has got worse than ever.
If the sparkies aren't working properly then the fuel won't burn and being a carbie will cause it to not start as well. I just use NGK sparkies, that's what a lot of people use.
From an article I saw somewhere I remember the FZR could use those Bosch sparkplugs as well as the NGK ones. But everyone I know just uses the NGK.
Just a thought about the difficulty starting... How did you clean the plugs? Reason i ask is if you've used a wire brush you may have inadvertantly widened the spark gap without meaning to. If you've got a set of feeler gauges check them out and make sure they're all within spec. ~0.7mm if i recall, but don't quote me on that! Also, check you've put all the plug leads back on correctly as a loose lead may manifest itself in difficulty starting due to bad contact. How tight did you do the spark plugs? Please!!! Follow the instructions on the packet and/or service manual.
I took the bike to the mechanic again today, opened the plugs again and readjusted the plug gap, I guess it was a bit wider. The problem actually was with the cold start, hot engine starts fine. The plug gap now readjusted, I shall see tomorrow if the bike starts fine. One thing thats stil not clear to me is...how should the bike run so smooth if the plugs I've got on it are not the recommended type, as I mentioned that it has two Bosch plugs and two NGK C7HSA plugs?
If they're both providing a hot spark, then once warmed up it'll run smooth... no matter what type of plugs you've got. But different types of plugs absorb / spread the heat differently. Which means they can result in your engine warming up slower, or too quickly (nothing like having a plug get too hot and cause pre-ignition...continously... until you turn the fuel pump off and it runs out of fuel). Also affects things like how well / badly the fuel burns, which may result in the plugs being fouled, etc... Better off just paying $20 for a set of the correct sparkies, and putting them in.
After readjusting the plug gap, the Little Beast now starts like a brand new bike. Thanks for the help!
