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Originally Posted by Arch-Angel Afaik, I, being an owner of the same old pulsar, i don't think with carb engines, you get to time the engine as it is not an FI engine. So no ECU/injection control whatsoever. Only thing one can do is maybe go in for a rebore or change your exhaust. Imo, it is best to leave her stock since you are attached to the bike, just like i am. |
guys, i think the discussion is again going all over towards ignition timing. I am talking about the valve timing, controlled mechanically by the camshaft and cams. this process is entirely mechanical. The CDI unit, or FI systems are related to fuel and spark plug timing. Or please correct me if I am wrong, is there anything I am missing over here??
I think the cam timing or valve timing can be advanced or retarded by altering the position of the degree of rotation of the camshaft in relation to the crankshaft. There are loads of articles about this but mainly on websites outside India and that too for vehicles that we dont get over here or cant afford. Hence, I started this discussion. Cant seem to find anyone who has experimented with the valve timings.
I have searched and searched and found out lots of articles in which people are either obsessing over a K & N air filter, larger carburettor, free flow exhausts, or reboring the cylinder. All this can be done, but with a lot of expenditure.
I am strictly against reboring as I do not consider that upgrading the engine. Its changing the engine altogether. What I want to do is try and squeeze out a little extra from my plain old carburetted 150cc engine. One of the potential ways I feel after a lot of reading and researching online is by trying to tweak the cam timings.
I believe this can be done because the tuning and setting of the stock engine is done keeping in mind various factors like fuel efficiency, longevity of the engine etc etc.
I am willing to compromise fuel efficiency as this bike will anyway be for occasional riding because I am a little attached to it.
The most I am willing to do is get a freeflowing air filter, retune the existing carb, or even get a bigger carb from a bigger pulsar, but thats it. After that I want to find out how much difference can be made by playing around with the valve timings. If even a slightly noticeable difference can be achieved, I am good with it. After that, maybe I'll start researching tweaking the CDI unit or an aftermarket CDI unit to alter the ignition timings.
Lastly, If i can squeeze out a little extra power from my bike, I would then like to use a smaller rear sprocket in order to reduce RPM's throughout the entire speed range.
Thanks anyone who can specially focus and throw light on the subject of valve timings or advanced cam timings.