2 stoke vs 4 stroke maintenance cost

[TwoSeven]

$105 for a 1000kms on a 250 four stroke
$75 for a 1000kms on a 150 two stroke.

A 250cc machine is effectively 66% bigger than the 150, so I think that would would have to make them comparable

In effect the 250 remains at $105, but to make the 150 equiv. I think one would have to make it like a 250, so $75 * 66% = $125. In that respect it is actually more expensive to run the 150 over the 250 in hyperthetical terms.

However, in reality the smaller the capacity the cheaper the cost of running - so one cant complain - even the tire cost would make up a heck of a lot of difference

I'm getting between 17 and 19 km/litre out of my Krappi 400, so for my $10 I get roughly 100 or so kms out of it. That kind of works out at about the same as the old cibby. Difference is that the krappi is an air cooled parallel twin and spends most of its time at 50km/hr. It would explode if I tried to drive it like the ol cibby.

[Crasherfromwayback]

Dunno if you mean me, but I still have wet dreams about that 5 minute ride on the RMZ on race slicks. Fuck me they're WICKED. The thing just never stops pulling (bit like me)

If I'd mentioned wet dreams for sure I would've been referring to you.
I was referring to old Sugilite (who I sold my last KX500 to).
We raced eachother at that motard meet in Upper Hutt (you were there you goober) and got a chance to line them up side by side.
Until he repeatedly carried out facial track inspections that is.
I'm with you at the mo though mate....all I can do with my 450 now is wash it down with man custard....sure as fuck not able to ride it just yet!
I'll be back.
Might just have to get someone to start it for me.....

[Wellyman]

They are a alright the RM-Z's but I hate the blue seat covers they ae putting on them what the hell is with that!!!
WM

[Crasherfromwayback]

You're so right mate, I hate that myself!
Luckily mines an '05' with the black/yellow cover!

[Wellyman]

You're so right mate, I hate that myself!
Luckily mines an '05' with the black/yellow cover!

They look so much fucken nicer then the blue seat poofy shit!My boss has a DRZ 2fiddy with yellow seat, and I was comparing it the other day and his older model looks so much nicer.
WM

[Sketchy_Racer]

A 250cc machine is effectively 66% bigger than the 150, so I think that would would have to make them comparable

In effect the 250 remains at $105, but to make the 150 equiv. I think one would have to make it like a 250, so $75 * 66% = $125. In that respect it is actually more expensive to run the 150 over the 250 in hyperthetical terms.

However, in reality the smaller the capacity the cheaper the cost of running - so one cant complain - even the tire cost would make up a heck of a lot of difference

I'm getting between 17 and 19 km/litre out of my Krappi 400, so for my $10 I get roughly 100 or so kms out of it. That kind of works out at about the same as the old cibby. Difference is that the krappi is an air cooled parallel twin and spends most of its time at 50km/hr. It would explode if I tried to drive it like the ol cibby.

Yes, but if you were to compare a two stroke bike with a four stroke,

its normally about double the cc for a 4 stroke .eg

150 2T = 250 4T

250 2T = 500 4T

and so on.....

plus, i would have my KR anyday of the week over the cbr.

To many things going round and round in a CBR for me. One piston works effectively.

[crazyxr250rider]

Going back to the original post I'd presume we are talking late model Enduro and MX bikes,and that means modern 4 stroke - my first reply was about new bikes...fuel,oil and a spark plug is all you'd use in each for moderate use in a year.But the thumper costs heaps more,for serious use they will change the synth oil every ride,that's more oil than the smoker will use....and for a mere mid season spruce up,the 2 stroke will just need rings and a powervalve clean,even a piston is cheap.But the 4 stroke will need possibly a chain valves and springs.Have you seen the pistons in these things? Like a Formula 1 piston,it's a wonder they don't flip over sideways in the bore.In no way are they anything like a good old XR250.

For a trail bike my DT230 makes as much HP as a 4 stroke twice it's size and half as heavy again,goes like a cut cat and hasn't been apart in nearly 30,000km - fuel,oil and a spark plug,change the gearbox oil,that's a years maintenance.

Some have teflon skirted pistons....

[Ixion]

Meh. What's wrong with cast iron, I say.

[IronicCapers]

Two simple things to remember

2stroke=dead simple engine, easy and cheap parts to manufactuer. Only downside if your a greeny is bad enviromental impact.

4stroke=Advanced engine, dam pain in the arse to get power out of. Valves annoying. Heavyr.

4-2= 2 reasons not to get a 4stroke

Joe Bloggs is a dumbarse but a good friend of mine (not to be confused with me) But he gives his thumbs up on maintenance and expenses

[TwoSeven]

Exactly what is advanced in a 4-smoke engine. Pistons, rods, valves, crank, cam, gears. Cant get more simple than that. Piston goes up and down, some things turn around.

[Sketchy_Racer]

Cam timing advances.... Variable valve timing on the Bandit 250s....

Tcss = Twin chamber swirl system on suzukis or some bull shit....

but hey just get a 2 stroke and all you have is a piston going up and down

[IronicCapers]

The pain in the anus timing, the addtional hoopla or the valve not to mention the cost of them(precision machined) And is it titanium intake and stainless exhuast? Not cheap materials. all the additional fiddly fucks and chucks that are required for the 4-smoker. And then theres the thing that happens when an average not that knowledgable about bikes person takes off the head."Fuck this SHit" Valves clearances for 1(not hard for me or maybe you but how many people will no of the lil tools that make it easier. Take off the head of a 2stroke and all you see is the piston dead simple. Point proved. Happy.


I am

[yokel]

and (mx) 4strokes are harder on the runin gear (chain, gear box and stuff) coz they take 4strokes to do full power cycle in sted of 2 or so im told make sense to me

[Crasherfromwayback]

That bits not quite right....

[Sketchy_Racer]

he is right about the 4T being more harsh on the runnning gear

a 4T has to wait 3 strokes before it gets one big HIT which slams through the running gear.

If you ride a older big thumping 4T and use very very low revs you can feel the thumps from the engine firing. As the revs gain, the thump becomes more of a vibration, but it is still doing the same to the drive gear.

A 2T fire every 2nd stroke.... im sure you get the rest.......