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Old 03-17-2013, 10:34 PM   #15076
Sateev
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Quote:
Originally Posted by 2bold2getold View Post
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.
Jets may be nominally sized in % of 1mm, but they are classified by FLOW. And flow is affected by finish, which is why you don't want to drill jets to a particular size, or run any sharp tool through them. The surface finish of the hole has a very large effect on flow.

Just sayin'
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Old 03-18-2013, 07:35 AM   #15077
DrKrisz
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Hy All!

I'm new here. I have 99' Dr 350.
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Old 03-18-2013, 07:37 AM   #15078
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Old 03-18-2013, 08:09 AM   #15079
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Old 03-18-2013, 08:19 AM   #15080
original mcguiver
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Quote:
Originally Posted by Sateev View Post
Jets may be nominally sized in % of 1mm, but they are classified by FLOW. And flow is affected by finish, which is why you don't want to drill jets to a particular size, or run any sharp tool through them. The surface finish of the hole has a very large effect on flow.

Just sayin'
I have been working on "every" type of 2 wheel motorized vehicle since 1958. I totally agree with 2old2getold; you can drill jets with good results and I've been doing it for decades. Drilling a hole in brass is not rocket science (how do you think the manufactures do it?) When what your working on has no parts available it is the only way to go. You can even solder them closed and drill them for a smaller jet size. I had to do this on every Moped sold at high altitude or they wouldn't run well enough to pull the hat off your head. Never had a problem........Just sayin

A little experience disproves a hell of a lot of "theory"
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Old 03-18-2013, 08:28 AM   #15081
2bold2getold
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Quote:
Originally Posted by Sateev View Post
Jets may be nominally sized in % of 1mm, but they are classified by FLOW. And flow is affected by finish, which is why you don't want to drill jets to a particular size, or run any sharp tool through them. The surface finish of the hole has a very large effect on flow.

Just sayin'
Yep, was expecting some feed back on this one. That's why I started with the disclaimer "FROM MY EXPERIENCE". And I have some, but of course that's subjective. If you don't like it don't do it.
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Old 03-18-2013, 10:24 AM   #15082
slartidbartfast
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Quote:
Originally Posted by DrKrisz View Post
Hy All!

I'm new here. I have 99' Dr 350.
Hi DrKrisz. Welcome to the DR350 forum.

Go here to learn about how to post pics

Go here to practice posting pics
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Old 03-18-2013, 10:29 AM   #15083
slartidbartfast
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Quote:
Originally Posted by original mcguiver View Post
I have been working on "every" type of 2 wheel motorized vehicle since 1958. I totally agree with 2old2getold; you can drill jets with good results and I've been doing it for decades. Drilling a hole in brass is not rocket science (how do you think the manufactures do it?) When what your working on has no parts available it is the only way to go. You can even solder them closed and drill them for a smaller jet size. I had to do this on every Moped sold at high altitude or they wouldn't run well enough to pull the hat off your head. Never had a problem........Just sayin

A little experience disproves a hell of a lot of "theory"
I've successfully done the jet reaming and soldering/re-drilling thing a few times - but let's be honest, it's a bit of a bodge! Worse, unless you deface the original size marked on the jet, you run the risk of screwing up any subsequent owner's initial tuning attempts (or your own, depending on how bad your memory is.)
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January 2010 New Zealand South Island ride
Summer 2009 UK to Alps ride
Summer 2008 UK End-to-End ride
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Old 03-18-2013, 10:50 AM   #15084
MrPulldown
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I am going to try firing up with no hoses other than the petcock vac and the fuel line attached to the carb. Will this cuase an issue if the vents and drains are jsut open?

Anyone know the stock jetting on a 90, DR250s.
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Old 03-18-2013, 12:38 PM   #15085
2bold2getold
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Quote:
Originally Posted by slartidbartfast View Post
I've successfully done the jet reaming and soldering/re-drilling thing a few times - but let's be honest, it's a bit of a bodge! Worse, unless you deface the original size marked on the jet, you run the risk of screwing up any subsequent owner's initial tuning attempts (or your own, depending on how bad your memory is.)
I never do this kind of thing unless I really need/have to, (the exception is idle/slow jets, see no reason to buy a new one every time they get stopped up) and I remark the changed jet so as to not get them confused. BTW I live at ~ 640 ft but do a lot of riding in NM and CO between 6k and 13K ft. The "98 DR350SE is the only bike I've had that didn't need any rejetting. Some of the older bikes needed a size or two smaller main jet and a couple had to go quite a bit more ( KLX300 & XR650R) the KLR650 was close, but a little smaller main cleaned it up some, but this one runs clean and strong completely stock. I love it.

2bold2getold screwed with this post 03-18-2013 at 03:11 PM
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Old 03-18-2013, 02:49 PM   #15086
duncanbojangles
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Stuff for sale in the flea market

Hey guys, I forgot to mention I have a few things for sale in the flea market: http://www.advrider.com/forums/showt...php?p=20977537. I've got a stock tank (with locking cap and key) and stock muffler left (sorry, the carb sold already).
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Old 03-18-2013, 04:10 PM   #15087
markk900
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Quote:
Originally Posted by MrPulldown View Post
I am going to try firing up with no hoses other than the petcock vac and the fuel line attached to the carb. Will this cause an issue if the vents and drains are just open?

Anyone know the stock jetting on a 90, DR250s.
No issue I can think of on the first question.....

On the second question, from the clymer manual both DR250 and 350 Dual sport with CV carbs are BST33 (so maybe you did get the stock 250 carb)...

Main 132.5 (350 is 135)
Pilot 40 (350 is 37)

otherwise pretty much identical.
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Old 03-18-2013, 05:27 PM   #15088
_CJ
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Finally got around to making myself a ghetto-fab rack. Built from scrap metal I had laying around. Next up will be a cutting board saddle bag combo.







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Old 03-18-2013, 05:59 PM   #15089
Anonawesome
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Originally Posted by _CJ View Post
Finally got around to making myself a ghetto-fab rack. Built from scrap metal I had laying around. Next up will be a cutting board saddle bag combo.

TEACH ME YOUR WAYS.
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Old 03-18-2013, 06:22 PM   #15090
mustangwagz
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"Ghetto-Fab Rack" looks great man! Id rock that baby till ya couldnt No-Mo'!! i have done this kinda thing myself before with my old XT350 (R.I.P.) Sometimes, the racks you build are the best....why?...cuz YOU made them, they work for what you want, and usually WAY stronger! lol I'm thinking bout RedNecKing some Ammo Cans onto the side of mine!
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