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Post by BillyGreen1973 on Sept 24, 2005 16:00:11 GMT
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Post by jules30 on Sept 25, 2005 8:20:59 GMT
wow thats cheap are they easy to change
jules
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Post by BillyGreen1973 on Sept 25, 2005 8:45:30 GMT
Yeah, all you have to do is unplug the lead from the top of the spark plug. clean around the Spark plug to make sure no bits of crud fall into the engine when you take the plug out. Take the spark plug out using a plug spanner or box spanner. Set the gap on the new spark plug, and screw the new one into the engine using your finger, until it's tight, then just turn it a little more with the spanner. BE CAREFUL not to over tighten it as you will strip the threads from the engine block, and that gets VERY expensive to sort out.
That lot sound complicated, but it isn't really that bad.
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Post by BillyGreen1973 on Sept 27, 2005 19:34:41 GMT
I have noticed a few people talking about 'Reading' the spark plug to get an idea of how the engine is running. This means you can tell from the state of the spark plug whats happening. Just as a guide, this spark plug was taken from my BT50QT-9 this afternoon, it's done approx 600Km and shows the engine is set up correctly. I will try and get photos of different plug conditions, and what they mean, over the next few days.
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Post by chcknugget on Sept 27, 2005 21:13:33 GMT
Yep, looks just right.
In the U.S., NGK C7HSA plugs are commonly only $.69 at auto parts stores. It's funny though, because some online scooter places sell them for $9 each!
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Post by browny on Oct 4, 2005 20:17:03 GMT
When you say better engine performance, what do you mean??? prolonged life?
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Post by BillyGreen1973 on Oct 5, 2005 18:04:44 GMT
One of every four cycles of the engine, an amount of fuel and air mixture is sucked into the compression chamber ready for firing on the firing stroke. This is called a 'Charge'
With each fuel/air mix 'charge', not all the fuel is burnt, some is exhausted with the exhaust gasses. It is this that produces the Hydrocarbons that are tested for on the MOT emissions test.
By using a quality spark plug you get a better, cleaner spark. This makes the firing of the petrol/air mixture easier, and burns more of the fuel in each cycle. This produces a better running engine, with lower emissions. It is also for this reason that the gap on the spark plug must be set correctly.
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Post by browny on Oct 5, 2005 20:21:24 GMT
Right so its deffinatley a good buy then?? Any chance for a photo/step by step guide as ill probally end up trashing the scooter without a guide!!
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