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Author Topic: XL 305 engines??  (Read 2309 times)

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Offline MX?

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XL 305 engines??
« on: July 09, 2009, 07:09:31 pm »
Firstly, thanks for the pic Bazza! great looking beast, and I'm sure I'll be asking more questions about it yet.....like, who did your work on the motor. :)

Thinking of going this way with my 250 along with head work etc.
So can this motor be a giant killer (In terms of holding it's own with bigger XL's )? or would I be wasting my time ...and money :(
Maybe I should just source an XL 350 motor in the first place and use that instead. ::)
Anyone know the weight difference between the 350 / 250 donks? can't be that much...can it?
Ideas??
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Offline matcho mick

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Re: XL 305 engines??
« Reply #1 on: July 10, 2009, 12:39:08 pm »
i know which motor i'd rather mx,my 350 weighs a ton  ::),250's gotta be lighter!  ;)
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Offline JC

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Re: XL 305 engines??
« Reply #2 on: July 13, 2009, 07:48:07 am »
250 engine is 9lbs (4kg) lighter.

As I've said elsewhere on the forum, Rob Tumes came w'in a wisker of beating all the bigbore 4strokes including CCMs on his 305 for the Nat title in WA several yrs ago.

If yr anywhere near Bris, go & see George McKenzie
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Offline 52

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Re: XL 305 engines??
« Reply #3 on: July 13, 2009, 09:25:27 pm »
Need rings for 305 piston @ 82mm. Has marking "HAINES" on underside, has anyone any ideas?
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Offline LWC82PE

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Re: XL 305 engines??
« Reply #4 on: July 13, 2009, 10:06:01 pm »
if you just need rings, send a sample to http://www.jp.com.au/JPPistons.html they might be able to help.


Piston Rings
JP Pistons have Australia's largest range of loose piston rings. Our sizes range from 1.000" right up to 12 inches! Ring types include cast and chrome compression rings for four-stroke and two-stroke engines as well as plain oil (single piece cast iron) and multiple piece oil control rings.

All rings are available as individual rings or as engine sets.

All JP Pistons piston rings are imported from leading ring manufacturers throughout the world. This gives us the greatest flexibility for getting the best rings for your pistons.
« Last Edit: July 13, 2009, 10:09:30 pm by LWC82PE »
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ltketch

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Re: XL 305 engines??
« Reply #5 on: July 14, 2009, 07:27:58 pm »
Can I ask what is actually involved in getting from 250 ot 305?  Is it simply boring out to the right dimensions, and fitting the right piston to the new dimensions? or is it a bit more involved, eg installing a new cylinder sleeve first and boring that out?

Also what sort of power improvement could one expect from doing this?

Thanks
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Offline MX?

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Re: XL 305 engines??
« Reply #6 on: July 14, 2009, 08:33:34 pm »
JE pistons http://www.jeproseal.com/ have anumber of 82mm rings as well. Surely one of these must work?
Itk....not real sure what's involved, but the kit I've bought has a new cylinder liner with it, so I guess it needs it?
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