DR350 Thread

[heirhead]

Originally Posted by ADV BUM

Try tubliss.

http://finder.cox.net/redirect?URL=h...30cfa792726234

OFFROAD USE ONLY!!
Has anybody ran tubliss on long tarmac rides?

Heirhead
Wolds worst mechanic

[ADV BUM]

Originally Posted by heirhead

OFFROAD USE ONLY!!
Has anybody ran tubliss on long tarmac rides?

Heirhead
Wolds worst mechanic

I have run tubliss for at least 50 miles of street at one time.
The only reason it says off road only is because it is not DOT certified. Neither are the led blinkers, aftermarket tanks, so on and so on. The foam inserts cant run on street because the heat builds up and melts the foam. In theory the heat from the tire would affect stock tubes more than the tubliss system. ARE TUBES DOT Certified?

[RuggedExposure]

I'm starting to think DR bikes are cursed.
Or don't like New Mexico.
Or don't like me.

Bullitman281 and I today began the 'pre-run' portion of our El Paso, TX to Sand Diego, CA trip using the border road.

A few hours into the trip his DR650 began puking out oil. So we limped it into El Paso and he decided to start taking it apart in the parking lot of a gas station:


A few hours later:


We eventually got some RTV gasket maker and got the bike sealed up again. The day trip that was only supposed to take a few hours turned into an 8 hour debacle. Tomorrow morning we leave for San Diego. Unless something else goes wrong.

And we haven't had a chance yet to take apart my 350. I have the feeling he's gonna be taking it home to CO and fixing it over the summer.

[MrPulldown]

Does the idle jet have a hole in the end

[2bold2getold]

Originally Posted by MrPulldown

Does the idle jet have a hole in the end

Mine's got a little bitty one (37.5), goes all the way through.

[MrPulldown]

Dang that is a small hole. A jet size is a jet size right. doesnt matter if it is a bts40 or a 33 or 31. They are the same jets.
The carbs I am messing with have a 40 Idel and a 132.5 or 135 main. I think these are early year 350 carbs.

[MrPulldown]

Dang that is a small hole. A jet size is a jet size right. doesnt matter if it is a bts40 or a 33 or 31. They are the same jets.
The carbs I am messing with have a 40 Idel and a 132.5 or 135 main. I think these are early year 350 carbs.

[2bold2getold]

Originally Posted by MrPulldown

Dang that is a small hole. A jet size is a jet size right. doesnt matter if it is a bts40 or a 33 or 31. They are the same jets.
The carbs I am messing with have a 40 Idel and a 132.5 or 135 main. I think these are early year 350 carbs.

From my experience,.... not sure all jets are the same, but the ones I've checked are sized as a % of a mm. so a 100 jet is equal to ~ .040" diameter. ... Then a 50 jet would be ~ .020" and a 40 jet would be ~ .016". I've got no problem running a correct size drill bit through jets to clean them or taking a small one and drilling it to the size I need, been doing it for years.

[VooDooDaddy]

Originally Posted by 2bold2getold

I've got no problem running a correct size drill bit through jets to clean them or taking a small one and drilling it to the size I need, been doing it for years.

Electric guitar strings of various diameters also work well in cleaning out funky/gunky jets...

[2bold2getold]

Originally Posted by VooDooDaddy

Electric guitar strings of various diameters also work well in cleaning out funky/gunky jets...

This is what I use .... http://www.motormeister.com/suz/carb_access/carb2.htm German Jet Reamer Kit .... near the bottom of the page. They're actually a small broach set. Easy to pack in your tool kit and will fit the smallest to the largest jets.

[Anonawesome]

I've used toilet cleaner. Typically I just find the most toxic chemical that won't harm brass (or any metal), and soak for a good 24hrs. Gives 'em a nice shine. Wouldn't necessarily recommend drilling out jets, very precise measurements and it's just too easy to muck it up that way. Not to mention new jets cost about the same as a drill bit anyway.

[slartidbartfast]

Originally Posted by 2bold2getold

From my experience,.... not sure all jets are the same, but the ones I've checked are sized as a % of a mm. so a 100 jet is equal to ~ .040" diameter. ... Then a 50 jet would be ~ .020" and a 40 jet would be ~ .016". I've got no problem running a correct size drill bit through jets to clean them or taking a small one and drilling it to the size I need, been doing it for years.

Different carb manufacturers use different jet-sizing approaches. I believe Mikuni jet numbers are based upon fuel flow-rate in cubic centimeters per minute (for a specific fuel under controlled conditions) so the shape of the orifice is important as well as the diameter.

[2bold2getold]

Originally Posted by Anonawesome

I've used toilet cleaner. Typically I just find the most toxic chemical that won't harm brass (or any metal), and soak for a good 24hrs. Gives 'em a nice shine. Wouldn't necessarily recommend drilling out jets, very precise measurements and it's just too easy to muck it up that way. Not to mention new jets cost about the same as a drill bit anyway.

A gallon can of Berrymans carb cleaner is about 30 bucks, comes with a dip basket and lasts forever. Back in the early "70s, there was no internet to order parts and no UPS and there wasn't a dealer on every corner ( or for that matter in the state) for your Ossa, Bultaco and Penton. Even the big four didn't carry a good supply of jets, so we had to do it any way we could. I've made jets from scratch that worked great. It's just a threaded piece of brass or in some cases plastic, with a hole in it.

[2bold2getold]

Originally Posted by slartidbartfast

Different carb manufacturers use different jet-sizing approaches. I believe Mikuni jet numbers are based upon fuel flow-rate in cubic centimeters per minute (for a specific fuel under controlled conditions) so the shape of the orifice is important as well as the diameter.

I've read that some jets are sized by flow ... volume... mass... weight... etc. It's just that all the ones I've checked over the last 40 + years are a % of a mm, or very close.

[MrPulldown]

Do you need a hose off the carb vent ("T" vent location) to run?

Right now I am running a 40 pilot with a 132.5 main for a dr250s. Not sure it will run with these jetts. But I am going to leave as much of the intake open and try. I am guessing that i never got the 250 carb with the mess of parts.

Need a few more things buttoned up and some freash gas, then I am going to ry to kick the bitch to life.