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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
ask a stupid question. port and ignition timing?
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[QUOTE="bclapham, post: 702857, member: 25565"] thanks guys, for some reason, i was seeing that the head was now closer to the piston and that was bringiing TDC in quicker- wadda mistaka to maka! i understand now- when we first built this rm engine it seems like everything was off with port timing- of course its not erics fault since we did the best we could to bring all the pieces together from many different bikes, LOL and i couldnt tell how it was supposed to run since i was coming off the 250. ive gone to essentially stock port timing now and was running a bit of advance (at the advice of steve who has a lot of experience with these 58mms) to get a bit of grunt out of corners and the bike runs well. i just wanted to know if i could now drop the cylinder 0.2mm with a thinner gasket to a bit more to get a tad more bottom and a bit more comp- and now i think i have the room to do it. one more question for Rich- i know that running more oxy in the fuel effectively advances the ignition- can we quantify or approximate this in any way? ie if we went from 5%mtbe to say 20% could we say this would equate to 1-2mm's movement on the stator? oh, another question, LOL- if we stroked the crank 2mm and used a 2mm shorter rod, how would this effect port timing and how would we alter it to keep the same type of power curve? would we need to port as well? thanks! and sorry for all the questions! :thumb: :worship: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
ask a stupid question. port and ignition timing?
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