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Author Topic: DR650 fuel switch issue  (Read 829 times)

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Offline Morokai

DR650 fuel switch issue
« on: April 23, 2013, 11:34:34 am »
So I recently bought a DR650 2011, since I got the bike I was riding with the PRI switch selected. After some research I learned it can cause alot of damage if left in PRI position, especially if you flood the carb. So this morning I took her for a test ride. In the ON position i get about 22km then she backfires and dies, cant start her again in ON position. Switch to PRI and all is fine. So I cant do a continuous drive in ON.

Is the "petcock"?? faulty, should I replace it??
Can it harm the bike leaving it in the PRI position while riding and switching to ON/RES when bike is standing?
Fear is temporary, Regret is forever.

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Offline DeepBass9

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Re: DR650 fuel switch issue
« Reply #1 on: April 23, 2013, 11:37:02 am »
What does the Prime position do? Mine just has main, reserve and off.

Offline edgy

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Re: DR650 fuel switch issue
« Reply #2 on: April 23, 2013, 11:38:18 am »
Check that you are not on reserve...try running her in the res position?
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Offline Morokai

Re: DR650 fuel switch issue
« Reply #3 on: April 23, 2013, 01:01:52 pm »
The PRI position gives a free flow of fuel into carb even when the engine is off ( can cause carb to oveflow ) , and the ON gives fuel to carb only when engine is running. This is what I understand.

I have left it on RES before, and also dies down after a while, as RES should do.

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Offline DeepBass9

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Re: DR650 fuel switch issue
« Reply #4 on: April 23, 2013, 01:05:37 pm »
The PRI position gives a free flow of fuel into carb even when the engine is off ( can cause carb to oveflow ) , and the ON gives fuel to carb only when engine is running. This is what I understand.

I have left it on RES before, and also dies down after a while, as RES should do.



OK, so there's a vacuum pipe to open the petcock valve when the engine is running? In that case the solutions is easy. There is no difference between riding on PRI and ON as in either case the petrol just runs into the carb. YOur problem is that the vacuum pipe is not opening the petcock. So the vacuum pipe may have a hole, not be connected properly or something like that. PRI is to fill the carb before the engine starts for the case where the petrol may have evaporated because the bike has been standing too long.
« Last Edit: April 23, 2013, 01:08:17 pm by DeepBass9 »
 

Offline Manfred

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Re: DR650 fuel switch issue
« Reply #5 on: April 23, 2013, 01:07:11 pm »
Might be one of those pipes that are loose.
The CV carb works on vacuum.
I think PRI bypasses it.  Lecap will know better.
Check and see if all the pipes from the carb are connected.
There will be one that is open that sits on top of the airbox.
 

Offline Manfred

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Re: DR650 fuel switch issue
« Reply #6 on: April 23, 2013, 01:15:32 pm »
The pipe marked in red, if I remember correctly, it should attach to the top of the carb
Like DeepBass9 says, might be something wrong with the pipe
 

Offline Morokai

Re: DR650 fuel switch issue
« Reply #7 on: April 23, 2013, 03:18:00 pm »
I inspected the vacuum pipe ( drawn in red ) and there does'nt seem to be any holes...sealed vacuum pipe

....????
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Offline DeepBass9

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Re: DR650 fuel switch issue
« Reply #8 on: April 23, 2013, 03:23:10 pm »
There is a diaphram in the petcock, could be torn.

Offline Manfred

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Re: DR650 fuel switch issue
« Reply #9 on: April 23, 2013, 03:31:03 pm »
If pipes are all good, yup, could be the petcock on the way out.

Guys in US usually fit the Yamaha Raptor petcock.
 

Offline chopperpilot

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Re: DR650 fuel switch issue
« Reply #10 on: April 23, 2013, 08:54:31 pm »
I inspected the vacuum pipe ( drawn in red ) and there does'nt seem to be any holes...sealed vacuum pipe

....????

Isn't there a kink in your vacuum pipe, or is it only the way you are pulling it? ???

You should be able to test the vacuum petcock by pulling the vacuum pipe of the carb, and sucking on it, checking that fuel runs out the pipe running to the carb, with that pipe removed from the carb of course. :thumleft:

 At least start somewhere with your trouble shooting. :thumleft:

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Offline lecap

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Re: DR650 fuel switch issue
« Reply #11 on: April 24, 2013, 08:55:11 am »
100 points to the Chopperpilot!!! :cheers:

Nothing will go through this kink. Not even a bit of vacuum.

Reroute the pipe and all will be fine.

The PRI position allows to start the engine immediately after running dry (in case you did not find RES before the engine cut out). Without the PRI position you would have to crank the engine for a while to build up some vacuum and allow fuel to fill the float bowl before the bike will start.
The ON - PRI - RES type fuel tap cuts fuel supply as soon as the engine cuts out / is switched off.

If the tap has only the positions ON - OFF and RES it's an aftermarket manual tap without vacuum valve. In this case fuel flow is open all the time on ON and RES means you should turn to OFF when parking and especially if you trailer the bike ::)

The DR's automatic fuel tap is of very good quality and highly fail proof. Should be retianed if possible when changing for a plastic tank.
Failures are normally limited to "does not close" which can be fixed quickly with very carful disassembly / carb cleaner & reassembly.
« Last Edit: April 24, 2013, 08:55:48 am by lecap »
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Offline Manfred

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Re: DR650 fuel switch issue
« Reply #12 on: April 24, 2013, 11:17:43 am »
Talking about vacuum Lecap, does the XR 125 carb work the same as the DR..?
 

Offline Morokai

Re: DR650 fuel switch issue
« Reply #13 on: April 24, 2013, 01:52:17 pm »
Thanx for all the help, really appreciate it  :laughing4:

O and the kink in the pipe is me pulling it.

So i pulled off the vacuum pipe on the carb side and started sucking....nothing happens, feels like an enclosed pipe. It is exactly the same on PRI and ON position. So i assume the petcock is stukkend and needs replacement.   :-\
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Offline lecap

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Re: DR650 fuel switch issue
« Reply #14 on: April 25, 2013, 10:01:01 am »
Talking about vacuum Lecap, does the XR 125 carb work the same as the DR..?


Our XR has a manual tap ON - OFF - RES
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Offline lecap

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Re: DR650 fuel switch issue
« Reply #15 on: April 25, 2013, 10:03:09 am »
...So i assume the petcock is stukkend and needs replacement repair.   :-\

Fixed. Cheaper. I can do.
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Offline Manfred

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Re: DR650 fuel switch issue
« Reply #16 on: April 25, 2013, 12:11:19 pm »
So the XR needs to be turned off when standing..?
 

Offline lecap

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Re: DR650 fuel switch issue
« Reply #17 on: April 26, 2013, 10:21:12 am »
So the XR needs to be turned off when standing..?


Ideally yes. Old school.
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Offline Manfred

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Re: DR650 fuel switch issue
« Reply #18 on: April 26, 2013, 10:26:38 am »
Cool, thanks
 

Offline Grumpleton

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Re: DR650 fuel switch issue
« Reply #19 on: April 30, 2013, 03:21:24 pm »
Mmm   :sip:  intresting reading, i never switch my tap of on the DRZ, if I do , and i leave the bike standing for a day or two the fuel runs out of the bowl over flow immediately when I switch it on again, I should change the needle and seat but to get that Frigging carb out is to-much like hard work, so i just ride it that way. :ricky:
« Last Edit: April 30, 2013, 03:22:00 pm by GrantE »
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