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Author Topic: DR200 carb & jets  (Read 753 times)

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Offline DeepBass9

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DR200 carb & jets
« on: June 21, 2010, 11:48:37 am »
I suspect my DR200 is running way too rich. Reason being is it smokes a bit and if you switch off the petrol tap the engine starts revving higher as the petrol in the carb is used up, before it stalls. Does anyone have a rule of thumb method for setting the fuel air mixture. (This is an old bike so a '2 turns out from stock' is not going to work.) I don't think it is worth dyno tuning the bike either! Can anyone help?

Offline grego

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Re: DR 200 Carb question
« Reply #1 on: June 21, 2010, 01:10:21 pm »
firstly make sure there are no leaks on the carb or the intake manifold.

start by turn the mixture screw about 2 - 2.25 turns out then use the idle speed screw (the one that pushes against the stopper on the throttle spindle) to get the engine to a nice fast idling speed.
then start playing with the mixture screw only to get the fastest and smoothest possilble idle at the leanest setting. then once you've done that adjust the idle speed screw to the desired idle speed.
 :thumleft:
 

Offline DeepBass9

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Re: DR 200 Carb question
« Reply #2 on: June 21, 2010, 01:23:46 pm »
Cool, I'll give it a try. Guess I must clean the air filter first as well. Am I correct in saying that turning the mixture screw out is richer and in is leaner?

Offline grego

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Re: DR 200 Carb question
« Reply #3 on: June 21, 2010, 10:17:31 pm »
Cool, I'll give it a try. Guess I must clean the air filter first as well. Am I correct in saying that turning the mixture screw out is richer and in is leaner?
ya, out richer and in leaner is usually the case on 4 stroke bikes.
 

Offline lecap

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Re: DR 200 Carb question
« Reply #4 on: June 22, 2010, 12:14:47 am »
...Guess I must clean the air filter first as well...

Yes ::)

... and if you switch off the petrol tap the engine starts revving higher as the petrol in the carb is used up, before it stalls...
normal
Carb is often set an eighth of a turn to half a turn richer than fastest idle as it will struggle to start and stall on takeover if too lean.
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur." (Red Adair)
 

Offline DeepBass9

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Re: DR 200 Carb question
« Reply #5 on: June 22, 2010, 07:25:19 am »
Thanks Le Cap, (And thanks for the bar risers BTW)

Offline lecap

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Re: DR 200 Carb question
« Reply #6 on: June 23, 2010, 09:48:34 am »
Standard setting for the DR200SE mix screw is 1 1/4 turns out.
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur." (Red Adair)
 

Offline Motorcycle Michael

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Re: DR 200 Carb question
« Reply #7 on: July 03, 2010, 12:02:43 pm »
Let the experts correct me if I'm wrong, but isn't the mixture screw only for setting idle mixture?
I have heard it described as that. (Idle mixture screw)
As I understand it the actual running mixture is controlled by the level in the float bowl. ie deeper equals richer... (easier for the engine to suck petrol through)

or is the float level the basic setting and the mixture screw the fine tuning...?  ???
No tar - No problem...
 

Offline grego

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Re: DR 200 Carb question
« Reply #8 on: July 03, 2010, 12:09:56 pm »
the mixture screw sets the mixture at idle and part throttle operation.
the main jet and needle valve take care of the mixture higher up in the rev/throttle range.
float level determines the amount of fuel that is allowed to enter the float bowl, too high a level can cause the bike to overfuel.
 

Offline lecap

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Re: DR 200 Carb question
« Reply #9 on: July 04, 2010, 12:14:01 pm »
Float level will have near to no influence on fueling at throttle wider open.

Slow jet, float level & air mixture screw / idle mixture screw whatever you call it are responsible for idle, take over & low rev.
Needle taper shape and taper height and main jet size responsible for mid and high range.
Full taps mostly main jet with slight influences from air jet (sits in the passage from velocity stack to emulsion tube) and emulsion tube itself as well as needle tip diameter.

Float level influence on fuel air mixture is the greatest on idle and decreases with revs picking up and with throttle wider open.
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Offline LoopSoosStroop

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Re: DR 200 Carb question
« Reply #10 on: July 16, 2010, 09:21:22 am »
firstly make sure there are no leaks on the carb or the intake manifold.

start by turn the mixture screw about 2 - 2.25 turns out then use the idle speed screw (the one that pushes against the stopper on the throttle spindle) to get the engine to a nice fast idling speed.
then start playing with the mixture screw only to get the fastest and smoothest possilble idle at the leanest setting. then once you've done that adjust the idle speed screw to the desired idle speed.
 :thumleft:

Hi grego

Should this be done with motor warm or cold?
 

Offline grego

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Re: DR 200 Carb question
« Reply #11 on: July 16, 2010, 08:41:42 pm »
at operating temperature with the choke fully disengaged (off).
 

Offline Dustdevil

Re: DR 200 Carb question
« Reply #12 on: July 16, 2010, 11:35:47 pm »
at operating temperature with the choke fully disengaged (off).

Operating temperature is normally reached after about 10 minute ride.
 

Offline Manfred

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DR200SE jet kits
« Reply #13 on: July 26, 2010, 11:18:02 am »
Greetings all

Was on the TT website and came across a thread about jetkits for the DR200.
Thought someone may be interested.

Here's the link for the guy selling them, unfortunately, in the USA.

http://www.kientech.com/DR200SEExhaustMod.htm

Manfred
 

Offline TVB

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Re: DR200SE jet kits
« Reply #14 on: August 07, 2010, 05:46:48 pm »
Greetings all

Was on the TT website and came across a thread about jetkits for the DR200.
Thought someone may be interested.

Here's the link for the guy selling them, unfortunately, in the USA.

http://www.kientech.com/DR200SEExhaustMod.htm

Manfred

Hi Manfred

Iím sure there are a few options available, a simple solution is to fit an after market canister and rejet. However, this is probably a cheaper solution to ad some horses. One has to ask you if it is worth it in the end. The DR is mend to be a farm bike (Jeep) and a commuterÖa very nice trail bike. I can really see the benefit; he cuts a big hole in the air box too which in the end will suck more dirt into the carb. Iíll keep it rather standard. However, thanks for posting. One forms your own idea in the end.
 :thumleft:
 

Offline Manfred

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Re: DR200SE jet kits
« Reply #15 on: August 10, 2010, 06:49:36 am »
Cool TVB, I would keep the Dr standard as well.

Its a 200 afterall.

Its quite popular in America, the guys there are forever coming up with interesting idea's to squeeze that last bit of power out of a stock engine