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Old 11-05-2006, 06:30 AM   #1
seruzawa
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Default Re: Two Stroke Top End Questions.

How do you run a 2popper MX engine "moderately"?



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Old 11-05-2006, 09:53 AM   #2
Buzglyd
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Default Re: Two Stroke Top End Questions.

I'd rather ride it like I stole it and worry about rebuilds later.
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Old 11-05-2006, 11:26 AM   #3
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Default Re: Two Stroke Top End Questions.

realistically it'll last longer if you spank it like a red-head step daughter. Running moderately will carbon it up and foul plugs. Two stroke top ends take about an hour to do if you're slow and cost a set of rings and a head gasket....



Spank it till it yelps, thats what they're made for.
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Old 11-05-2006, 11:38 AM   #4
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Default Re: Two Stroke Top End Questions.

Right on. If you want to ride like a granny in the dirt then buy a 4-stroke.



Don't forget the advantages of 4stroke MX bikes. They are easier to ride due to lack of power. And you want to baby them anyhow because the too frequent top end jobs cost $500.
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Old 11-05-2006, 12:49 PM   #5
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Default Re: Two Stroke Top End Questions.

So you are interested riding the bike moderately. Plus you are worried how many hours you get out of it. Boy have you bought a wrong bike. Get an old Honda XR250 and ride it for the rest of your life. Doesn´t matter how old you are.



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Old 11-05-2006, 01:48 PM   #6
mscuddy
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Default Re: Two Stroke Top End Questions.

If you keep the air philer klean and run Yamaha R @ 32.1 with premium gazoline it shud last for a very long time.



I had a piston/ring assembly last for 8 YEARS on an '86 YZ490. Astonishing, what?



Yamahaha top ends last forever. And when your wears out, try to find a YZ360 kit that Noleen/Ohlins marketed back in the early 90's.



Remember, clean=long life on 2 strokes.
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Old 11-05-2006, 03:08 PM   #7
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Default Re: Two Stroke Top End Questions.

Hmm. You kind of have to define "moderately". Are you racing? Trail riding?



If you are trail riding for about 3 hours and outing, 2 times a month, the top end will last a looong time. I have a 200 KTM 300 EXC with the stock cylinder. I have put 2 pistons in it over the years.



Enjoy it, and just listen for it to get loose.



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Old 11-05-2006, 05:56 PM   #8
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Default Re: Two Stroke Top End Questions.

When racing, a top end is normally changed every 4 races. That's also what the service manual says.
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Old 11-05-2006, 06:45 PM   #9
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Default Re: Two Stroke Top End Questions.

I had a 1983 Suzuki RM125, which I bought in 1986. It had the original piston in it then and had the same piston in it when I sold it 3 years later!!

I'd guess that I put about 300 to 500 hours on it. I used the bike for trail riding, and doing jumps. I'd say it was used moderatly. My guess would be about 800 hours of running time for a YZ250. Only if you keep the air filter clean, and use good engine oil and gas. I really liked the Bel Ray MC-1. I'd mix it at 55:1. Like they recommended. Have fun.
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Old 11-05-2006, 11:54 PM   #10
Tadgh
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Default Re: Two Stroke Top End Questions.

funny ..thats why all the mx bikes and sx bikes are pretty much all four stroke



remember real men ride four strokes always have.

as a former yz250 owner i'd have to say my 450 easily out drags it and without having to pray for the front wheel to come back down or the rear to snap back into line...



but i have to admit for some fun you cant beat messing around on stink wheels
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