DT200WR versus a CRM250?

[xander77]

Hi
I have a Mk3 CRM which has always seemed tame for a 2 stroke, Mates just got a Yamaha DT200WR now that thing is an animal compared to mine! ok that might not be what you want in a trail bike! but it has way more kick top end than mine and the bottom ends seems ok! so has anyone ridden both of these bikes and can tell me if thats how the CRM should be against the Yam?

Cheers

[knackeredMk1]

There is no such bike. Should be DT200 or WR200. DT has autolube, WR has the oil pump blanked off.

Both should be slightly slower than a CRM250 , though they might feel quicker as 200 has more of a 'hit' due to needing to be more highly tuned to get more power from a smaller engine at peak. So less low/mid range. SHould be lighter and better suspended if WR version.

[xander77]

Ok but whats this then? http://www.motorcyclespecs.co.za/model/ ... r%2090.htm

thats the bike he has! but there is a real power valve hit on his but mine just kinda revs and dies out! is that normal for the CRM? for there to be such a difference in power delivery?

[knackeredMk1]

That is the DT version. I didn't realise there was a DT200wR, but there is a WR200 .

Maybe the powervalve isn't working correctly on your CRM or there is some other problem . The rush of power at the top end is not strong on a standard CRM as it has a strong low/mid range - this is why it is such a nice off road engine, but there should be a noticable increase in acceleration.

Provided you are on similar gearing your bike should be every bit as fast as his. Yamaha increased the engine capacity to 230cc in the 'Lanza' (late model DT by a different name) to close the gap in performance to the 250 trail bikes.

[xander77]

knackeredMk1, I have checked the outer power valve cable end is moving, but not checked the actual power valve yet? I will soon, but his bike fels well more powerful than mine! can`t be right that!

[knackeredMk1]

With the exhaust off feel for the point where the PV is fully open against the exhaust port then mark the PV arm against the barrel somewhere under the PV cover.

When you have got the bike assembled check that the PV arm lines up with the mark when the bike is running (at an RPM where the PV should be fully open) and adjust if it doesn't. This will give you a much more accurate setup for full power than the manual.

Also your bike might be higher geared than his . E.g. your bike tops out at 90mph whereas his won't go faster than 75 ..............

Also 'feels faster' does not neccessarliy mean 'is faster'. Try them side by side.

[pudzie83]

as daft as it sounds have you cleaned your air filter/carb recently check your plug if its black then this is a sign but a black plug can mean other things to, a crm should have a dt200 also is your mate running a track gear set up as knackered said? if you have a much smaller cog on the rear that will make a very noticeable difference in delivery

[njhardy]

I saw one of these DT200's the other day- exactly the same as the picture. I thought it was a 125 actually- made a really tinny noise, very high revving and totally original. The guy tried to race away from me, so I caught him up and then easily powered away from him- and mine isn't a powerhouse! So answer is- CRM is much faster, even though it doesn't feel it.

[xander77]

Thats the thing mine is running 13/47 so it should be real snappy, its fine low down and mid range plenty of power, but no top end powerband or noticable step in power?

[pudzie83]

mk2s have a airbox restriction plate in the airbox if you have one in the mk3 get rid of it also check your exhaust for carbon blockage the only other thing it could be thats already been said is the rc valve not set up correct

[njhardy]

I am running a 14/52- so even more acceleration and plenty of low, mid & top end- but in top gear by 55km/hr. Air box restrictor doesn't do much to power and an aftermarket pip improves things too. Powervalve & jetting problems will make loads of difference though...check these are set-up right and you can even keep up with KX220's and WRF250's on the trail...

[xander77]

Power valve is moving when I move the arm, still got to check how far it moves, the video on UTube is good for comparison! can I move the cable adjustment to get more top end? just to see if it makes a difference? there is no 2 stroke powerband step on mine! though thats the whole point of a power valve really?

I will check how much the arm moves when I rev the bike tomorow! should please the neighbours no end!!

[SkidMark]

disconnect the cable at the PV pulley, take the exhaust off and set the power valve to full open as view through the exhaust port, mark the arm position at the cable pulley for reference later. refit exhaust, reconnect PV cable to pulley and adjust so that when throttle is full open your mark lines up.

[xander77]

Top idea Skidmark, wish I had thought of that when I had the exhaust off, oh well where is that socket set!!! lol

[knackeredMk1]

Xander - You really should spend more time reading the FAQs ..................................... .