Two Stroke Top End Questions.
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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.
Spank it till it yelps, thats what they're made for.
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17,449 Posts
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.
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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1,521 Posts
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.
- cruiz-euro
- cruiz-euro
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5,447 Posts
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.
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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3,874 Posts
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.
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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46 Posts
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.
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.
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
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
My 1950 Harley Hummer 125 2-stroke is on its second piston and rings (after 3 Catalina races and several scrambles). I did freeze up the engine and break the crank once. Of course, I haven't ridden it since 1958, but the engine's was new when I put it away. So my piston and rings have lasted 50 years.
well the rules are set for 250 2 strokes and 4 stroke 450s to run in the same class, i dont think its a displacement advantage. its set like all racing .. you can probably run a 500 2 stroke versus the 990s in motogp if you still want to...i dont think there is a major power advantage just how its delivered thats all...
as for the gnccers well wasnt scott summers pretty successful on a xr650 of all things ?? anyhow i think salminen would take them all to school on any bike ...there are a few crf 450s running high in that series ...and then they all get their asses handed to them by david knight on a ktm (four stroke)....
but in maybe the WEC you see most of the winning is done on 4 strokes on the overall timing .. and i dont know what it is but the gncc us riders just dont do well for some reason and in the isde as well (starting in new zealand today i think)
but its horses for courses ..i have ridden all types and find the four stroke easier to ride at an average pace but harder to ride at 100% where the 2 stroke seems harder to ride at average pace than flat out ...
as for the gnccers well wasnt scott summers pretty successful on a xr650 of all things ?? anyhow i think salminen would take them all to school on any bike ...there are a few crf 450s running high in that series ...and then they all get their asses handed to them by david knight on a ktm (four stroke)....
but in maybe the WEC you see most of the winning is done on 4 strokes on the overall timing .. and i dont know what it is but the gncc us riders just dont do well for some reason and in the isde as well (starting in new zealand today i think)
but its horses for courses ..i have ridden all types and find the four stroke easier to ride at an average pace but harder to ride at 100% where the 2 stroke seems harder to ride at average pace than flat out ...
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