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Author Topic: Stupid DR750  (Read 1007 times)

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Offline Raven

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Stupid DR750
« on: August 22, 2008, 10:16:04 am »
Ok now I need help or I set fire to this bike. We've had the bike for 2 months all was well first week, then carb started leaking took it back to the shop to fix, after three attemps by the shop, stopped leaking but then had a fuel starvation problem, took it to NS suzuki  been there 2 weeks and 2 attemps later got left on the way back from Cullinan so back to the shop. Is there anyone out there who has an idea what the problem is or someone who can fix it, Im starting to hate the bike. Total time ridden 4 times, total time in shop 25 days, starting a fire with it priceless.
 

Offline Eisbein

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Re: Stupid DR750
« Reply #1 on: August 22, 2008, 11:19:06 am »
Does it use a fuel pump ?

'Carb leaking' - does that describe overflow or physically leaking ?

Sounds like there might be an issue with the tap as well.

If its vacuum I suggest checking/replacing the following:

 
  • Your tap - if it is a 'vacuum type' check the membrane - also check for dirt.

Disconnect the pipes to and from the carb - check if the petrol isn't flowing when it shouldn't be.

Suck on the 'suction' side control pipe and see if it starts flowing

  • You tank - take it off and make sure its clean
  • Fuel filters and other surrounding equipment - check all the pipes and filters if they are still ok.
  • Carburettor - check the needle and seat - check of the floats still work the way they should.



Other than that I don't know.


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Offline Usurper

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Re: Stupid DR750
« Reply #2 on: August 22, 2008, 11:21:27 am »
Does the DR have an SU type or float chamber carb (should be float chamber if you are having fuel starvation but it not running lean generally)?
Then the most logical explanation for this will be that A: they installed a carb kit? did they? (this is a set of gaskets and needle and seats, etc.) and what would then make most sense that B: in installing the needle and seat (the valve that control the fuel level in the float chamber) they screwed up the float level and it is now to low. Other than that it may be a fuel pump problem, but that is a bit obvious and they should have check that first off.
Well thats what I can remember from my tjoening-Weber-Side-draft-carb days.
Your best bet would be to take the bike to a carb specialist...
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Offline Raven

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Re: Stupid DR750
« Reply #3 on: August 22, 2008, 12:22:14 pm »
Tx for the advice I am going to have to take it to a carb expert the guys at the workshop dont seem to understand them, anyone you can suggest.
 

Offline Usurper

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Re: Stupid DR750
« Reply #4 on: August 22, 2008, 12:49:17 pm »
ohhh... I dealt with these things when I was still living in Namibia, I did get kits and jets from Carb Doctor in Vermeulen str in Pretoria but not sure if they are still there  ???
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Offline Go Big

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Re: Stupid DR750
« Reply #5 on: August 22, 2008, 02:59:52 pm »
Note the bike has two seperate tanks. Sometimes you get an air lock from right side to left where they join up. This can cause major probs. Probably not that but just check it out.

Also if your fuel pump aint working well the bike will carry 15 litres and not supply a drop to the carbs. You have to have the pump to get the fuel out and it wont feed by gravity. Therefore agree with previous posts about making sure the fuel pump works.

Is this MR or Mrs Raven asking.

Take out the air cleaner put some fuel on a (clean) rag and hold it in the airbox (dont let it go!) swing it and let us know if it fires up for a short while then dies or if it just wont start.

(PS have you checked the valve clearance?? Mentioned this in your previous post.)
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Offline Raven

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Re: Stupid DR750
« Reply #6 on: August 22, 2008, 03:32:18 pm »
Mrs Raven asking the questions and relaying the reply to Mr Raven who doent have internet. Have checked the fuel pump and all seems ok the major problem with the bike is when we are out on the open road once you get to 5 th gear and try go more the 110 she just startes to die so you need to gear down again cant seem to get the revs over 4000. This doesnt happen while driving in town. The thing is this bike used to get 140 no problem with two up before we had the carb fixed (petrol leaking from every where on the carb) Havent check the valve clearance yet had to give the guy at the workshop my manual to get him to check this.  Need to go to a bike maintanance school cant stand not understanding how it works.
 

bobnob

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Re: Stupid DR750
« Reply #7 on: August 22, 2008, 04:14:44 pm »
Mrs Raven asking the questions and relaying the reply to Mr Raven who doent have internet. Have checked the fuel pump and all seems ok the major problem with the bike is when we are out on the open road once you get to 5 th gear and try go more the 110 she just startes to die so you need to gear down again cant seem to get the revs over 4000. This doesnt happen while driving in town. The thing is this bike used to get 140 no problem with two up before we had the carb fixed (petrol leaking from every where on the carb) Havent check the valve clearance yet had to give the guy at the workshop my manual to get him to check this.  Need to go to a bike maintanance school cant stand not understanding how it works.

sounds like starvation - i had the same on my TT600

my bike would run fine but as soon as you nail it it would die after a while - cut out completely

if i then let the bike stand it would start up and run fine again

at the end of the day i tracked the problem down - to a rubber tube - that was to small to allow the correct amount of petrol through

the float bowl would run dry and the pipe would not feed petrol quick enough

i replaced the tube with a bigger diameter tube - and all was fixed

when the guys work on the carbs they will replace tubes and stuff with new tubes and a 1mm smaller diameter tube will screw you over but it will almost be impossible to find the problem

 

Offline Raven

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Re: Stupid DR750
« Reply #8 on: August 22, 2008, 04:23:34 pm »
Thats exactly what happens we died on the way back from cullinan stood on the side of the road for a while then tried again she started first time and we rode home. Im going to have a look at the pipes tonite.
 

Offline Groenie

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Re: Stupid DR750
« Reply #9 on: August 22, 2008, 04:48:31 pm »
Where are you Raven? Can you bring the bike to me to have a look? I'm in Wierda Park and we're having a sort of a tech day tomorrow.

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Offline Baches

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Re: Stupid DR750
« Reply #10 on: September 04, 2008, 10:59:49 am »
Had a DR 750 and a DR 800. Both had the same problem of fuel starvation, could not go faster than 130/140. Tried everything to sort out the problem but eventually sold both. Nobody in Cape Town could fix the problem.
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Offline lecap

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Re: Stupid DR750
« Reply #11 on: September 04, 2008, 12:14:02 pm »
Had a DR 750 and a DR 800. Both had the same problem of fuel starvation, could not go faster than 130/140. Tried everything to sort out the problem but eventually sold both. Nobody in Cape Town could fix the problem.

Should have asked me.

Thats exactly what happens we died on the way back from cullinan stood on the side of the road for a while then tried again she started first time and we rode home. Im going to have a look at the pipes tonite.

Classic. Blocked tank breather valve causes partial vacuum. This one is very difficult to diagnose as it often is intermittend and comes with a host of different symptoms from cutting out to not starting hot or hard to start at all.
I' ll write something up for the KLRistos and KLRistas soon but it basically applies to all bikes.
If you have a breather valve dismantle and discard. If you have breather tubes make sure they are not blocked.

First and second problem of OP btw not directly related. Overflowing carb is caused by dirt or wear in float needle valve, fuel level rises until it drains through overflow. Some bikes have the same problem caused by perishing o-rings in the float / needle valve assembly (BMW F650 Funduro).
Fuel starvation as said caused by blocked tank breather.
Similar problems do occur on fuel pump fed carbs if the fuel pump is on its way out. Note that "pumped" carbs often do not run properly on gravity feed.
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Offline Metaljockey

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Re: Stupid DR750
« Reply #12 on: September 04, 2008, 12:49:58 pm »
What Lecap said.

Easiest way to check for tank breather valve problems is to ride it with the fuel cap off, or loose, so that air can move into and out of the tank.

If that does not fix the problem, it's not the breather.

Next would be to check the fuel tap, they get bunged up if a bike stands for too long.



Offline lecap

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Re: Stupid DR750
« Reply #13 on: September 05, 2008, 09:22:58 am »
What Lecap said.

Easiest way to check for tank breather valve problems is to ride it with the fuel cap off, or loose, so that air can move into and out of the tank.


+1 but don't brake hard !!!
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Offline toucan

Re: Stupid DR750
« Reply #14 on: September 05, 2008, 09:23:42 am »
+1 on what lecap said.
have you checked the fuel filter? could it cause these symptoms if its blocked?
i'm not a complete idiot. some parts are missing.
 

Offline GRIM

Re: Stupid DR750
« Reply #15 on: September 05, 2008, 12:09:06 pm »
Does it have the same little plastic fuel filter in the carb inlet pipe as the DR650?
That also potentially clogs & often overlooked.
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