2 strokes dont like full throttle
Inferno
Tim fulcher
That asides I really wouldn't recommend any 2s for dual
sporting. 2s don't like constant throttle openings
I would think that 2s are ment to be open almost all the time, as opposed to
ridin them at idle
inferno
RM250
Inferno I read this too, it was badly worded, what was meant was that 2
strokes run lean if held pinned for great lengths of time - they were
designed for bursts of power - except road 2 strokes which are tuned to
compensate for this.
Somehow I still think its sounds stupid and can't be true, come on, 2
strokes are all about top end hit what is the point of having it if you
can't use it!?
Trevor S
throttle) are not the best for 2 strokes.
Trevor S
"Inferno" <Inf...@NeverNever.Land> wrote in message
news:yF6y6.130204$A6.31...@news4.rdc1.on.home.com...
Tim Fulcher
entirely. 2s do not like to be held at 2/3 throttle for long periods but
perform best with varying throttle openings. Ever wonder why when you have a
2s pinned on the flat for 10-20 km's it's advisable to hit the kill button
every 30secs or so? The Big end gets hot and needs nice cool petrol to give
to cool it off. BTW if, in those circumstances you don't hit the kill button
it WILL blow. Similarly don't pin it for 2 to 3 minutes and just chop the
throttle. It WILL blow the big end. Ask me I've done it. The motor suddenly
makes this weird death rattle.
If Inferno can hold a 2s wfo for 3 or 4 minutes off-road (as opposed to on a
dirt road) he's either a f$%^ good rider or a liar. By WFO (huh,
youngsters!) I mean with the throttle pinned, stretching the cable etc. Not
on idle as inferred by Inferno.
That's what I meant. If you feel like babying a specialized competition (and
highly) tuned competition motorcycle on the road then that's up to you. But
I 'd like something a little less temperamental.
TooFastTim
('01 EC250)
('01 TXT250)
"Trevor S" <trevor_s@_No_SPAMO_bigfoot.com> wrote in message
news:3ac91e47$0$25505$7f31...@news01.syd.optusnet.com.au...
Simmonsmc
honda couldent keep an XR togethor long enough to beet them.
Mike Simmons
99 KTM 300 MXC
AMA/ Dist.36
Hayward Honda/Suzuki/Sea-Doo 510-886-0644
D-H Cycles KTM/Suzuki/Cannondale Modesto
Glen
I think I hear it asking for it when I ride.
Glen
80 Yamaha YZ250
01 Suzuki DRZ400S
Reeko
Its just a question of jetting. For long sustained WFO, you need to jet a
little rich on the main.
Reeko
"Tim Fulcher" <timjf...@yahoo.com> wrote in message
news:3ac9b...@news1.mweb.co.za...
DirtCrashr
>strokes are all about top end hit what is the point of having it if you
>can't use it!?
My KTM300 is all about low-end torque and climbing over greasy rocks.
DirtCrashr
'97 KTM300MX/C '95 CB1000 ~ D-36, BRC, CORVA, COHVCO, HHORA, NRA, AMA, and
FOLMA
RM250
DirtCrashr wrote :
> >Somehow I still think its sounds stupid and can't be true, come on, 2
> >strokes are all about top end hit what is the point of having it if you
> >can't use it!?
>
>
> My KTM300 is all about low-end torque and climbing over greasy rocks.
I was referring to the older breed of 2 stroke, today all 2 strokes have a
fairly wide powerband - trails bikes also have a load of bottom end grunt,
but traditionally if you were after grunt e.g. for your KTM 300 applications
you would go for a 4 stroke
Wesley Grass
>
> >Somehow I still think its sounds stupid and can't be true, come on, 2
> >strokes are all about top end hit what is the point of having it if you
> >can't use it!?
>
> My KTM300 is all about low-end torque and climbing over greasy rocks.
Uh, Keith ... the throttle turns about 3 times further than you think
;-)
Wes
Douglas Wandell
you are WFO. No lube. Shoulda called Guiness Book to measure the skid
mark the last time my rear wheel locked up because of this...
--
Doug Wandell, Internet System Engineer
Internet Computing Systems-- UUNET Worldcom
dwan...@uu.net -- 703-886-4919
DirtCrashr
>Uh, Keith ... the throttle turns about 3 times further than you think
>;-)
>
>Wes
Doh! Not if I want to climb greasy rocks! Anyhow if I did that I'd have to
start adjusting valves and things, right? ;-)
DirtNimrod
Vintage Dave
speed around the banking at Daytona, ahead on every same size four stroke (250
class), second they will not sieze when they run out of gas (assuming it not
being run lean by someone that doesn't know how to jet) because the oil stays
in the engine longer than the gas does, i.e. the oil sticks on the metal. The
only reason that a two stroke is not as comfortable to run on the road is that
modern two stroke offroad bikes have very low flywheel mass and the engine
wants to keep changing speeds and is therefore not steady in low load, when not
speeding up or down.
All this crap about kill buttons, not being able to run full throttle is
ignorant. Even old two stroke i.e. from the 60's can run flat out with proper
jetting and oil without problems. I've run 100cc class desert bikes for many
miles at a time across dry lakes in the late 60's and never had a problem.
Small two strokes were winning road races in the 60's with none of the problems
that people claiming. Gee, either bikes are worst today (which they are not)
or all these so called problems are BS.
Vintage Dave
Gez
wanting to test the top speed, but have been scared to keep the
throttle pinned for longer than about 10-20seconds at a speed around
75mph. I wan't to try and get 80 out of it as I've heard numerous
people say it's capable of just nudging 80 on the speedo. I think I'll
keep cruising at 55-65 though :) - the bloody winds strong at 75mph
with no fairing!
--
Gez
Vintage Dave posted:
> First two stroke road race bike runs at complete full throttle at max revs and
<snip>
> Vintage Dave
Craig
Douglas Wandell wrote:
>
> Probably for the same reason you never want to run out of fuel on 2 when
> you are WFO. No lube. Shoulda called Guiness Book to measure the skid
> mark the last time my rear wheel locked up because of this...
>
Snip......
Jim Cook
Gez,
Like they said, you just have to jet for the WFO (Wide Full Open)
throttle position, if you hold it open very long. I seized three
different open class IT Yamahas, before I got that trick down.
Wudsracer
Tree Dodger Rock Finder
Team LAGNAF
DIRTy Deeds Done DIRT Cheap!
http://www.smackovermotorsports.com/
Ross Carlisle
They run WFO (or atleast 90%) all day everyday and typically go 250 hrs
before a rebuild. I have a 2 stroke paramotor that Ive been flying for a
year now. Because of its payload (me) it has no choice but to run WFO most
of the time.
Ive noticed that with the planes, EGT and CHT temps are optimum at about 90%
RPM. Reducing the throttle raises temps and increasing to 100% RPM
decreases.
If I had a problem burning down engines on a 2 stroke dirt bike, I'd install
an EGT guage and monitor it while I ride. If there is a jetting problem, it
will be evident in the EGT.
Ross
Dave Dude
My '78 DT250 is a grunt monster. Though not as quick it is faster than
a RM250 on top too. It's old and air cooled to boot.
Dave Dude
78dt250e
Dave Dude
<timjf...@yahoo.com> wrote:
>Trevor seems to have hit the nail on the head. The rest of you missed it
>entirely. 2s do not like to be held at 2/3 throttle for long periods but
>perform best with varying throttle openings. Ever wonder why when you have a
>2s pinned on the flat for 10-20 km's it's advisable to hit the kill button
>every 30secs or so? The Big end gets hot and needs nice cool petrol to give
>to cool it off. BTW if, in those circumstances you don't hit the kill button
>it WILL blow. Similarly don't pin it for 2 to 3 minutes and just chop the
>throttle. It WILL blow the big end. Ask me I've done it. The motor suddenly
>makes this weird death rattle.
snip
Dude you seem to have forgotten about all the dual sport two strokes
of the seventies. Then there are things like 1969 Suzuki Titan 500 two
stroke street bikes. I know a guy who has 180,000 miles on one. Two
strokes can be made to handle the conditions you describe. No
problemo.
Dave Dude
78dt250e
RM250
> My '78 DT250 is a grunt monster. Though not as quick it is faster than
> a RM250 on top too. It's old and air cooled to boot.
>
> Dave Dude
> 78dt250e
my RM250 is a 1990 model it has grunt but top end is what it lives for, as
for the speed thing your bike won't be geared the same as an RM if I geared
my bike I could easily do the same speed and with the power MX bikes produce
probably still get there pretty quickly - not that I care my RM's top speed
is plenty for off road rutted land!
Vintage Dave
end. Smooth and very controlable. MFG are making what the riders want from a
two stoke and that is quick response and speed.
Vintage Dave
The Deeneys
DirtCrashr wrote in message
<20010403180644...@ng-md1.aol.com>...
>Doh! Not if I want to climb greasy rocks! Anyhow if I did that I'd have
to
>start adjusting valves and things, right? ;-)
The V-force reeds & Wiesco piston have given my ATK a really meaty
low-mid range, while maintaining the killer top end. At the big sand
hill climb on the Moab Rim trail, David Ladd (Gas-Gas 250) & myself
were the only riders to crest the top. Well OK, a couple of other riders
made it, but with lots of paddling and flogging their poor 4-strokes.
I didn't even have to use full throttle on the ATK.
Because I very rarely hold the 2-stroke open for this long, I did a
little trick at the top of the hill to quench the piston. While in neutral,
I would wind the engine up to mid-range, then hit the kill switch & give
it a hand full of throttle. This injects unburnt fuel into the engine. The
vaporizing fuel quenches the piston & cylinder. I did this 2-3 time.
-Jeffrey Deeney- DoD#0498 NCTR UTMA BRC COHVCO AMA
dee...@frii.nospam.com '99 ATK 260LQ-Stink Wheels '94 XR650L-DreamSickle
We don't stop riding because we get old, we get old because we stop riding.