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#141685 - 05/16/18 06:41 PM Pulling the motor down, what mods can I do?
NZSpokes Offline
Junior Member

Registered: 10/20/17
Posts: 17
Loc: 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?

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#141687 - 05/16/18 07:38 PM Re: Pulling the motor down, what mods can I do? [Re: NZSpokes]
peejman Offline
Platinum Member
*****

Registered: 06/03/13
Posts: 2844
Loc: 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.

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#141691 - 05/17/18 05:49 AM Re: Pulling the motor down, what mods can I do? [Re: NZSpokes]
NZSpokes Offline
Junior Member

Registered: 10/20/17
Posts: 17
Loc: New Zealand
Its a 225.

Anybody know a good amount to skim the head?

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#141696 - 05/18/18 07:20 AM Re: Pulling the motor down, what mods can I do? [Re: NZSpokes]
NZSpokes Offline
Junior Member

Registered: 10/20/17
Posts: 17
Loc: New Zealand
Hmmm, maybe leave the base gasket out and use RTV. Like a free head skim.

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#141699 - 05/18/18 12:17 PM Re: Pulling the motor down, what mods can I do? [Re: NZSpokes]
peejman Offline
Platinum Member
*****

Registered: 06/03/13
Posts: 2844
Loc: 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.

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#142037 - 07/01/18 08:37 PM Re: Pulling the motor down, what mods can I do? [Re: NZSpokes]
Nic Offline
Junior Member

Registered: 01/10/18
Posts: 7
Loc: Canada
What year is your bike? I wouldn’t skim the head but that’s just me

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#142044 - 07/02/18 07:37 AM Re: Pulling the motor down, what mods can I do? [Re: NZSpokes]
Paul49 Offline
Platinum Member
*****

Registered: 07/22/11
Posts: 1594
Loc: High Peak, UK
Keep it reliable.
_________________________
1958 Ariel 650 FH, 2014 Tiger Sport1050, 1995 XT225 Serow, Tiger 800 XRx.

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#142047 - 07/02/18 04:34 PM Re: Pulling the motor down, what mods can I do? [Re: NZSpokes]
skypupbob Offline
Junior Member

Registered: 02/02/17
Posts: 17
Loc: 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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