Pulling the motor down, what mods can I do?

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Pulling the motor down, what mods can I do? #141685 05/16/18 06:41 PM
Joined: Oct 2017 Posts: 26 New Zealand N NZSpokes OP Junior Member
OP NZSpokes Junior Member N Joined: Oct 2017 Posts: 26 New Zealand	My beloveds bike with 9k miles on it has a leaking base gasket. So I need to strip it down. Obviously I will fit new rings. But what should I do while im in there? Looking for more power so maybe skim the head? Porting?

Re: Pulling the motor down, what mods can I do? [Re: NZSpokes] #141687 05/16/18 07:38 PM
Joined: Jun 2013 Posts: 4,160 East TN USA peejman Platinum Member
peejman Platinum Member Joined: Jun 2013 Posts: 4,160 East TN USA	Do you have a 225 or a 250? A big bore kit is available for the 250. https://procycle.us/bikepages/xt250.html#engine This guy tried a lot of stuff... http://www.xt225.com/forums/ubbthreads.php?ubb=showflat&Number=120095 This shall pass, be still and know. 2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.

Re: Pulling the motor down, what mods can I do? [Re: NZSpokes] #141691 05/17/18 05:49 AM
Joined: Oct 2017 Posts: 26 New Zealand N NZSpokes OP Junior Member
OP NZSpokes Junior Member N Joined: Oct 2017 Posts: 26 New Zealand	Its a 225. Anybody know a good amount to skim the head?

Re: Pulling the motor down, what mods can I do? [Re: NZSpokes] #141696 05/18/18 07:20 AM
Joined: Oct 2017 Posts: 26 New Zealand N NZSpokes OP Junior Member
OP NZSpokes Junior Member N Joined: Oct 2017 Posts: 26 New Zealand	Hmmm, maybe leave the base gasket out and use RTV. Like a free head skim.

Re: Pulling the motor down, what mods can I do? [Re: NZSpokes] #141699 05/18/18 12:17 PM
Joined: Jun 2013 Posts: 4,160 East TN USA peejman Platinum Member
peejman Platinum Member Joined: Jun 2013 Posts: 4,160 East TN USA	I don't know that I'd do much more than flatten it, if necessary. If you fancy doing the math, compression ratio calculations are fairly simple. The hard part is cc'ing the head to determine it's volume. http://www.csgnetwork.com/compcalc.html This shall pass, be still and know. 2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.

Re: Pulling the motor down, what mods can I do? [Re: NZSpokes] #142037 07/01/18 08:37 PM
Joined: Jan 2018 Posts: 10 Canada N Nic Junior Member
Nic Junior Member N Joined: Jan 2018 Posts: 10 Canada	What year is your bike? I wouldn’t skim the head but that’s just me

Re: Pulling the motor down, what mods can I do? [Re: NZSpokes] #142044 07/02/18 07:37 AM
Joined: Jul 2011 Posts: 2,113 High Peak, UK Paul49 Platinum Member
Paul49 Platinum Member Joined: Jul 2011 Posts: 2,113 High Peak, UK	Keep it reliable. Current: 1958 Ariel 650 FH, 2014 Tiger Sport1050, 1995 XT225 Serow, 2016 Tiger 800 XRx.

Re: Pulling the motor down, what mods can I do? [Re: NZSpokes] #142047 07/02/18 04:34 PM
Joined: Feb 2017 Posts: 137 idaho S skypupbob Member L1
skypupbob Member L1 S Joined: Feb 2017 Posts: 137 idaho	I am with Paul, keep it reliable. Higher compression won't make enough more power to notice and it will move your cam closer to the crank , the cam chain tensioner will run out of travel sooner. If you really want more power then bore it. I've heard they make big bore pistons for the 4 wheelers that fit the 225 and are very reliable.

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