Ingah Posted May 15, 2009 Posted May 15, 2009 Just wondered if someone more learned then me can look at this and tell me what they think?http://www.dansmc.com/seizure.htmIs this partly why 2-strokes are "unreliable" unless you know what you're doing? Or is it a joke?I can think back to when i used to do 170 mile journies on my CG125 (not that long ago really), down the motorway, at ~60mph constant speed. If i had say, a 125cc 2-stroke equivalent, would this have meant my engine would've died for sure?! Quote
rosszx9r Posted May 16, 2009 Posted May 16, 2009 Is this partly why 2-strokes are "unreliable" 2 strokes are not inherently unreliable!the lube system needs setting up properly, thats all. i ran 2 strokes for years (travelling 40miles on motorway to glasgow and back) and the only issue i had was with the crank nut spinning off and drilling through the crankcase but that was a week after i'd finished restoring the bike and it was my fault for not fitting the locking tab properly! once repaired it never faultered again. i sold the bike with 45k miles on the clock and it was running sweetly. loads of old RD's around with 30 - 40k on the clock.most 2 stroke rebores are done to restore power after the cylinder wears over time Quote
MtotheJ Posted May 16, 2009 Posted May 16, 2009 Still kinda glad i got rid of mine when i did Was so nervous of thrashing it in case it when BANG Quote
Guest Posted May 16, 2009 Posted May 16, 2009 i've had a few strokers, GP100 seized after the oil pump failed, so no oil to the cylinder..MTX50 no problems with engine, just a sierra that broadsided meSB200 no problemsSuzuki GT200X5 - forgot to top up oil and had a minor seize, once engine was cold freed up and no problems. (oh, and topped up with oil)MTX125, no problems.so no 2 strokes aren't inherintly problematic. and the SB200 did a day trip from Keswick to Edinburgh and back.. without fuss. Quote
Guest Posted May 16, 2009 Posted May 16, 2009 Got to agree with ross if they are looked after they aint unreliable at all Quote
Ingah Posted May 16, 2009 Author Posted May 16, 2009 Just wanted to draw attention to:Is this partly why 2-strokes are "unreliable" unless you know what you're doing? I should probably clarify that to mean for the average motorbike beginner, i.e. a first motorbike.What do you guys think of the linked website - i mean from reading it it would seem to be that if i get a 2-stroke 125cc for example, and ride 100-odd miles at constant throttle, say down the motorway (due to small cc, this would also be high throttle), the engine would seize! I was hoping someone could tell me if that's true because it certainly didn't happen with my old 4-stroke CG125! Quote
rosszx9r Posted May 17, 2009 Posted May 17, 2009 I should probably clarify that to mean for the average motorbike beginner, i.e. a first motorbike.What do you guys think of the linked website i did read the comments on the site last time.... it comes down to setting the lube system up correctly. set it up right and there shouldn't be any problems.if you read the whole document, this guy is refering to running a dirt bike at 1/2 throttle for long distances. dirt bikes aren't meant to run long distances. i'd suspect the lube system is set up differently to that of standard road bikes. oil pumps for 2 strokes provide a constant stream of oil while the engine is running then an additional squirt of oil as the throttle is opened and closed. road bikes will have a decent flow of oil continuously while a dirt bike is more likely to depend on the 'squirt' of extra oil as the throttle is used because of how the bike is expected to be used. Quote
Guest Posted May 17, 2009 Posted May 17, 2009 Just wanted to draw attention to:Is this partly why 2-strokes are "unreliable" unless you know what you're doing? I should probably clarify that to mean for the average motorbike beginner, i.e. a first motorbike.What do you guys think of the linked website - i mean from reading it it would seem to be that if i get a 2-stroke 125cc for example, and ride 100-odd miles at constant throttle, say down the motorway (due to small cc, this would also be high throttle), the engine would seize! I was hoping someone could tell me if that's true because it certainly didn't happen with my old 4-stroke CG125!i think if you read the question you'd understand that this is discussing 2 strokes, not 4, completely different engines.. Quote
Guest Posted May 17, 2009 Posted May 17, 2009 I got a two-storke 1100 STX jetski - 200+ hours and has never let me down Quote
cyberwolf Posted May 17, 2009 Posted May 17, 2009 hmm that looks like the same kind of damage you get with piston slap Quote
Ingah Posted May 17, 2009 Author Posted May 17, 2009 I should probably clarify that to mean for the average motorbike beginner, i.e. a first motorbike.What do you guys think of the linked website i did read the comments on the site last time.... it comes down to setting the lube system up correctly. set it up right and there shouldn't be any problems.if you read the whole document, this guy is refering to running a dirt bike at 1/2 throttle for long distances. dirt bikes aren't meant to run long distances. i'd suspect the lube system is set up differently to that of standard road bikes. oil pumps for 2 strokes provide a constant stream of oil while the engine is running then an additional squirt of oil as the throttle is opened and closed. road bikes will have a decent flow of oil continuously while a dirt bike is more likely to depend on the 'squirt' of extra oil as the throttle is used because of how the bike is expected to be used. So you're saying it probably happens only to 2-stroke dirt bikes, and not 2-strokes in general? This is good And re. my 4-stroke CG125 - i wasn't very clear on that - what i actually meant was that i used to use my 125cc for long motorway journies at constant throttle, and i never would have thought in million years that any bike engine would seize (whether it be a 4 or a 2 stroke) due to simply being kept at constant throttle for a while (seemingly creating hot spots in the engine from what i read) - that would never have crossed my mind, so i'm glad that i wasn't riding a bike subject to this problem (i would have been surprised if my CG had seized because i bought it for its famed reliability!) Quote
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