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Old 03-22-2013, 07:55 AM   #15151
thump!
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Location: Northeast Tennessee
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Quote:
Originally Posted by PHILinFRANCE View Post
Hi all HELP PLEASE

92 DR350 starts a peice of piss after 2 weeks standing BUT WONT RUN AT HIGH REVS !!! coughing and spluttering and no pick up !!

Had the carb to bits loads of times and cleaned like a new one , had the jets out and and petcock cleaned everything !!

It also sort of back fires through the carb !!!wierd put my hand on it and nearly jumped out of my skin first time.

Getting sick of it now !!!!! any ideas

Phil
If you're running the CV carb, I suggest you look for a leak/tear in the rubber slide diaphragm. If there is one, it will be hard to see unless you hold it up to a light and stretch it out. I once rode around quite a while on a DR350 with the TM33 pumper carb that wouldn't run at all wide open but ran reasonbly well otherwise. Turns out the main jet had come unscrewed and was laying in the bottom of the float bowl... but you've already been there.
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Old 03-22-2013, 08:27 AM   #15152
Greg Bender
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Location: Cave Creek, Arizona, United States
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Quote:
Originally Posted by thump! View Post
If you're running the CV carb, I suggest you look for a leak/tear in the rubber slide diaphragm. If there is one, it will be hard to see unless you hold it up to a light and stretch it out. I once rode around quite a while on a DR350 with the TM33 pumper carb that wouldn't run at all wide open but ran reasonbly well otherwise. Turns out the main jet had come unscrewed and was laying in the bottom of the float bowl... but you've already been there.
On my CV carb, the diaphragm was just a little "shrunk". It still fit (kinda), but it did not perform right. A new diaphragm transformed the carb. :>

Regards,

Gregory Bender
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Old 03-22-2013, 01:02 PM   #15153
travis789
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Originally Posted by Greg Bender View Post
Sounds to me like the diaphragm at the top of the carburetor should be replaced. Mine had those symptoms early on when I switched from a new pumper to a used CV carb. I love the CV carb now on my kick start dirt machine :>

Regards,

Gregory Bender
Thanks Gregory, I'll check that carefully and probably order one just in case. I have to send away for the o-ring that goes on the float unit anyway.
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Old 03-22-2013, 01:21 PM   #15154
thump!
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Originally Posted by travis789 View Post
Thanks Gregory, I'll check that carefully and probably order one just in case. I have to send away for the o-ring that goes on the float unit anyway.
You have to buy the whole slide to get the diaphragm. Don't remember exactly how much but I do recall they are kind of pricey. I repaired one on a KLR a few years back with silicone sealer. It was still working fine a couple of years later when I sold it.
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Old 03-22-2013, 01:30 PM   #15155
Greg Bender
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Originally Posted by thump! View Post
You have to buy the whole slide to get the diaphragm. Don't remember exactly how much but I do recall they are kind of pricey. I repaired one on a KLR a few years back with silicone sealer. It was still working fine a couple of years later when I sold it.
Actually, the diaphragm is available separately, see part number 13507-44B00, for example.

Rocky Mountain shows sells it for $18.06 (I have not compared prices elsewhere).

http://www.rockymountainatvmc.com

Regards,

Gregory Bender
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Old 03-22-2013, 04:11 PM   #15156
thump!
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Originally Posted by Greg Bender View Post
Actually, the diaphragm is available separately, see part number 13507-44B00, for example.

Rocky Mountain shows sells it for $18.06 (I have not compared prices elsewhere).

http://www.rockymountainatvmc.com

Regards,

Gregory Bender
Cool, that's good news.
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Old 03-22-2013, 07:13 PM   #15157
travis789
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Quote:
Originally Posted by PHILinFRANCE View Post
Hi all HELP PLEASE

92 DR350 starts a peice of piss after 2 weeks standing BUT WONT RUN AT HIGH REVS !!! coughing and spluttering and no pick up !!

Had the carb to bits loads of times and cleaned like a new one , had the jets out and and petcock cleaned everything !!

It also sort of back fires through the carb !!!wierd put my hand on it and nearly jumped out of my skin first time.

Getting sick of it now !!!!! any ideas

Phil
have you checked the valve clearances? Backfiring through the intake could be a symptom of an intake valve that's too tight and not closing all the way. We are lucky it only takes a few minutes to check them on Drs.
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Old 03-22-2013, 07:56 PM   #15158
jmderyke
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Pilot jets

hey guys, I am on the final stretch of having my dr put back together. Its now a 362cc port and polished with tm33 pumper carb thats running a little lean. It has the stock 37.5 pilot jet and idles up with the choke on at opterating temperature and can not adjust pilot screw out any more (and there are no air leaks fyi).
I would like some advice on how many jet sizes to order for jetting? I was thinking of ordering a 40, 42.5, 45, and a 47.5 think I may need to go higher?
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Old 03-22-2013, 08:05 PM   #15159
MrPulldown
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Fired up the bastardly child Dr today. Could not kick start it, but it bump started right up when I rolled it down the hill. Good thing it started. Don't know if I would have been able to push it back up. Flat front tire and no clutch.
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Old 03-22-2013, 08:22 PM   #15160
2bold2getold
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Originally Posted by jmderyke View Post
hey guys, I am on the final stretch of having my dr put back together. Its now a 362cc port and polished with tm33 pumper carb thats running a little lean. It has the stock 37.5 pilot jet and idles up with the choke on at opterating temperature and can not adjust pilot screw out any more (and there are no air leaks fyi).
I would like some advice on how many jet sizes to order for jetting? I was thinking of ordering a 40, 42.5, 45, and a 47.5 think I may need to go higher?
Not sure what your problem is. What does it do with the choke off. 362 isn't a lot bigger, dought if you will need a lot bigger jets. 1 or 2 sizes up at the most.
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Old 03-22-2013, 08:44 PM   #15161
jmderyke
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Quote:
Originally Posted by 2bold2getold View Post
Not sure what your problem is. What does it do with the choke off. 362 isn't a lot bigger, dought if you will need a lot bigger jets. 1 or 2 sizes up at the most.
Yeah its definitely lean at idle, the plug is grey not the coco brown im looking for, it will idle with the choke off
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Old 03-22-2013, 10:14 PM   #15162
MadChap
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$4,200......for a DR350

Portland, OR craigslist a guy is wanting $4200 bucks for a DR350 with 1100 original miles. Yes it's nice.......but $4200 bucks. WOW, I might think about selling mine if they are worth that much LOL.
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Old 03-22-2013, 10:22 PM   #15163
tnktm
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Digging the DR


tnktm screwed with this post 03-22-2013 at 10:31 PM
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Old 03-22-2013, 10:34 PM   #15164
heirhead
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Originally Posted by MadChap View Post
Portland, OR craigslist a guy is wanting $4200 bucks for a DR350 with 1100 original miles. Yes it's nice.......but $4200 bucks. WOW, I might think about selling mine if they are worth that much LOL.

2 much

heirhead screwed with this post 03-31-2013 at 10:04 PM
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Old 03-23-2013, 12:07 AM   #15165
PHILinFRANCE
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Originally Posted by travis789 View Post
have you checked the valve clearances? Backfiring through the intake could be a symptom of an intake valve that's too tight and not closing all the way. We are lucky it only takes a few minutes to check them on Drs.
Cheers Travis
I had thought it could be a valve problem but not having a real mechanical mind i didn't fancy doing it !!!!
Looks like i'mgoing to have to though
Phil
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