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11 Jun 2010
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Join Date: Feb 2010
Location: Devon UK
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Tune up
I am looking to increase performance mainly in lower end grunt and acceleration, so which piston and head should I be looking at?
I am not bothered about top end.
I see Kedo sell a 98mm 10:1 635cc or 101mm 10.75:1 675cc, both 141Euros.
I would take it to a specialist to do the work and maybe get them to gas flow the head and fit a new camshaft.
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11 Jun 2010
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Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
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Personally, I'd go with a "Wiseco" or "JE performance" piston a +1mm with 12.1 :1 compression and a stage-1 camshaft(cost around 220euros + shipping), opened up airbox with hi flow air filter, kedo downpipes, a good muffler, hi-speed inlet ports(reduce inlet ports at least 20%) and jetting everything accordingly!
That's just about the best performance gains you can get out of the XT's engine without sacrificing much reliability and not getting you broke!
Vando
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11 Jun 2010
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Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
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If you want a little more poneys out of the engine you'll have to do some extra work and spend quite bigger amount of money...
A forged clutch basket with a good clutch disc kit with HD clutch prings which is lighter and gives better performance and cooling. (these baskets normally have alot more holes for the oil to go through!)
A lighter flywheel rotor.
Have you ever serviced the engine before? replaced piston or valves or clutch or whatever?
If you have, I'd recommend a complete engine flush and cleanup!
Why? because most of the performance lost in an engine is due to friction!
friction caused by using dirty tools, dirty hands, uncleaned parts, mixture of old oils etc etc etc....
Also, one of the parts you should have EXTREME CAREFULL when replacing parts is where the camshaft slides in the top of the cylinder head!
Any touching with tools there and it'll make scratches even blemishes are a problem for friction and dirty tools is def a no no!
Have fun!
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11 Jun 2010
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Registered Users
Veteran HUBBer
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Join Date: Feb 2010
Location: Devon UK
Posts: 123
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Yes I have already got the devil big bore headers, silencer, piperx air filter, snorkel out, iridium plug.
So for low end grunt and acceleration you would suggest a piston +1mm with 12.1 :1 compression (rather than the 2 I mentioned?) and a stage-1 camshaft.
Would that be from Kedo? I got their new 2010/11 catalogue through this morning.
I have only ever changed the oil, oil filter, plug, air filter, never touched the piston, valves or clutch.
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11 Jun 2010
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Registered Users
Veteran HUBBer
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Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
Posts: 1,544
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Hi! well.. stage-1 camshaft supossebly offers better low/midrange...
For low end power I suggest you also change your sprocket combo!
I may offer to suggest 14/47 for more power and so you don't loose too much top speed as well...
As for the pistons.. I suggest you don't go directly to the 101mm upgrade...
Yes, it should give you some very nice power but I don't think the crankshaft would hold up too long with that PLUS, any cylinder damage and you'd have to either get a new cylinder sleeve or even a new cylinder!
I haven't seen the KEDO piston kits but I'd personally go with a Wiseco or a JE performance piston.... JE pistons are widely used on NASCAR cars so I believe they are of really good quality and very much comparable to Wiseco!
I do suggest you one little thing... a magnetic oil screw!
A Hi flow oil filter could also be a good thing...
Vando
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11 Jun 2010
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Registered Users
Veteran HUBBer
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Join Date: Sep 2007
Location: XXX<-Portugal->Azores->Santa Maria (island)
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check this link for the camshafts:
[url=http://www.je-kolben.de/index2.php?view=nocken&HID=28&lan=en]Gro
just delete the "[url=" and the "]Gro" parts..... HUBB IS GETTING CRAZY lol
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