home ported cyinders

[sheerider1026]

well i started a thread a while back about home porting my cylinders.. i finished them up the other day.. i knife edged the transfers, opened them up and smoothed them, did the intake the same way, and opened the exhaust up and polished it.. i also widened the transfer port windows a little bit.. i put them on and wow.. the topend has less compression than my other set of cylinders(they need bored) but ir runs very well.. very responsive.. the power seem to come on very quick(right off idle almost) and it pulls hard .. the powerband is more broad than before.. i am very satisfied and do not regret what i did to them(must have done something right i supose).. i will pull them back off soon to send them in for a bore job(just wanted to see if i liked them before spending the money on a bore job.. ) just wanted to share that with u guys.

[Bansh-eman]

for the life your losing on the motor compaired to the power gain of boring , its not worth it. theres other ways to get more power from that motor without eatting the life away from it

[sheerider1026]

what do you mean?? i think u may have misunderstood what i did.. my shee was together and running.. i had an extra set of used cylinders and pistons on the shelf, which are the ones i ported.. they where at .020 over.. when i was done porting them i switched them out on my shee to see how they ran.. they ran great but compression is a bit low.. so i will pull them back off to have them bored to get my compression back up..

[Bansh-eman]

oh the way i understood you was that you wanted to bore out your jugs you just ported to get more power. if thats the case then dont do it. if your talking about just getting a better seal you might be able to get away with honing it out and re-ringing it. mic it and see if they are out of round before you go and bore it ut and its not needed.

[sheerider1026]

well the rings that where on it where shot.. i had some low hour >020 over rings i used.. the pistons still had a lot of slap in the bores.. at idle the motor is a little noisy(rattle) so i am assuming a rebore is in need.. no worries though.. i have 2 more sets of virgin cylinders (stock bore and port) .. i am proud of my port job though.. the results that i got are the ones i was after.

[BANKRUPT]

some before and after pic would be great...

sounds like you did a good thing.. ( i like that you have extra jugs just in-case)lol

did you use a file of a die-grinder???

post pics :biggrin:

[sheerider1026]

i should have taken pics.. i will take pics when it comes back apart for the bore job.. gonna go ride tomorrow.. i used a dremed with the flex shaft attatchment.. i used the stones for sharpening chains saw.. they are long and slender(size of the lead inside a pencil, maybe a lilttle bigger) they work great for the corners also.. also used some angled small stones for the intake. and used sanding drums for the exhaust.. i am really happy.. it rips hard right off idle and pulls smooth and strong throughout entire rpm range.. it also looked very clean and neat.. i also bead blasted everything(except the exhaust) after i was done..

[sheerider1026]

sorry i can't spell .lol i used a dremel

[Washburn]

Yup, I get to see cylinders being ported for top mid and low combinations. Im gonna watch Cody do it to mine a little then Ill take over and Ill be porting from then on. As long as you have a steady hand and a good idea +tools its yours.

[Snopczynski]

Why does everyone look or ask for pics of ported cylinders. You cant tell how a cylinder is ported by looking at pictures. The most crucial and big changes made to porting are port window heights. I dont get how looking at a picture of the intake, or the bottom of the transfers gives everyone a good viewpoint as to the radical port job the cylinders have. Only way to check and look at porting is by checking port window heights and sizes. Those are the crucial things that determine the power range.

[sheerider1026]

that is very true.. although helping an engine breathe better is also a big help.. but for drastic changes like snop said, the port windows height, angle, and width are crucial.. i read up some on mine.. the only port windows i changed where the transfers width.. i didn't go taller with them, i just wanted to add a little grunt and all around usable power.. my gains are good with what i did, but don't get me wrong, if i sent them out to someone to have them professionally ported it would be much better,, but hey my extra power was free, and plus i enjoyed doing it anyway.. i have 3 banshee here and one is stock, one is a cheetah cub bike, and this one is now a diy port job.. make fun if u want, but i know i didn't screw my cylinders up.. i trail ride it anyway so i wasn't looking for an all out drag port or anything.. just to have an edge on my other shee riding buds..

[patarol]

Yea, know wat you talking about, did a clean op port on my jugs with a dremel and the result was great. good filing knowing I did it!!! and enjoyd doing it!!!

[sheerider1026]

yea.. i did go the extra mile and removed some metal from mine while i was at it.. gotta watch yourself and know when to stop cutting.. i can see how it would be easy to get carried away..

[Wildcardracing]

yea.. i did go the extra mile and removed some metal from mine while i was at it.. gotta watch yourself and know when to stop cutting.. i can see how it would be easy to get carried away..

Glad to see that the porting had the results you were looking for :thumbsup: Hope my advice was helpful. Once you get them bored and get the compression up they should be a lot more impressive, you'll have to let me know.

[sheerider1026]

Glad to see that the porting had the results you were looking for :thumbsup: Hope my advice was helpful. Once you get them bored and get the compression up they should be a lot more impressive, you'll have to let me know.

yes slobanshee your tips were very helpful.. it has less compression with these cylinders than it did before i tore it apart but it runs better. amazing.. can't wait to get it bored.. should scream..