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Old 07-23-2010, 11:28 AM   #5281
ptgarcia
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Quote:
Originally Posted by yondering
True, but the FCR wouldn't be any better than the mikuni pumper at compensating for altitude changes. CV carbs are good for this.


Yeah, I rode from the floor of Death Valley up to over 5700' ASL and my DR-Z ran perfectly the entire trip. I credit most of that success to the CV carb.
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Old 07-23-2010, 02:53 PM   #5282
rubberband
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Ok I verified my gearing 15/46. My question is what is a safe rpm to run at on hwy, or just higher speeds? 60mph=6000rpm as it sits right now. Is that ok? 70mph=7000rpm etc

and I'm on a 1997 SE
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Old 07-23-2010, 03:07 PM   #5283
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I've never heard of damage from running too much rpm and don't know of a way to define or determine what would be too much rpm to run. I typically keep my 250 under 6k rpm (mostly because with my gearing that's as fast as I care to go on this thing), but its got a much shorter stroke and a bit smaller valves so whatever the rpm limit is, it'll be a fair bit higher for the 250. As long as you keep oil in it I don't think you'll manage to hurt it no matter what rpm you cruise at. The power tapers off pretty early and the rev limiter seems set for a very conservative rpm. I'm sure you'll be plenty safe at 6k rpm.

If you are nervous about it you could go to taller gearing. I have 15/41 on my 350 right now I think and that seems to be a pretty good compromise - allows fairly relaxed rpm on the road but low enough that the gearbox isn't too gappy off road. I was running a 16 on the front of my 350, but that was a bit tall for really technical off road work and made the jump from 1st to 2nd too great for tight trails. It worked quite well on the road though.
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Old 07-23-2010, 03:20 PM   #5284
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BP< Thanks for the info, I was thinking 15/43 when I shop for a new chain and sprockets. I agree anything over 75mph is a little squirley on this bike. Between knobbies and rim locks the front end is bouncing around pretty good as well.
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Old 07-23-2010, 05:43 PM   #5285
MiteyF
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First post here, just picked up a 93 DR350S as my daily commuter (to replace the 1972 2-stroke Kawi). I'll try and get a pic up soon.

On another note, who wants to buy a stock exhaust can? Very nice shape...
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Old 07-23-2010, 08:12 PM   #5286
shearboy2004
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Quote:
Originally Posted by DisTech
I need an exhaust and I'm not to happy with the stock, SuperTrapp, Pro Circuit or FMF choices. If the FMF Q4 was available for the dr350 I'd probably get that. Any other model bikes exhaust that are known to be interchangeable with the dr350?

Does anyone know anything about this video with a White Brothers MX4, like what year and model bike is the MX4 for? Did they have to modify the midtube (if there is a midtube)?


I may be wrong but I'm thinking melted plastic with that exhaust being too close >
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Old 07-23-2010, 08:19 PM   #5287
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Quote:
Originally Posted by MiteyF

On another note, who wants to buy a stock exhaust can? Very nice shape...
$$$$$$ ?
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Old 07-23-2010, 08:27 PM   #5288
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$$$$$$ ?
Best offer? I've got no use for it.
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Old 07-24-2010, 05:00 AM   #5289
Greg Bender
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Quote:
Originally Posted by BikePilot
If you are nervous about it you could go to taller gearing. I have 15/41 on my 350 right now I think and that seems to be a pretty good compromise - allows fairly relaxed rpm on the road but low enough that the gearbox isn't too gappy off road. I was running a 16 on the front of my 350, but that was a bit tall for really technical off road work and made the jump from 1st to 2nd too great for tight trails. It worked quite well on the road though.
Hi BikePilot,

I concur, a 15/41 works pretty darn well. I'm able to run 70 MPH fairly easily and can push a bit more should I want to (I'm 6'4", 215 lbs).

Usually, though, I'll stick with 14/41 simply because I like it better off pavement and I don't ride much on pavement. Of course, the swap from 14 to 15 only takes a few minutes.

Question: When I fit the 14, I can easily retain the half-moon shaped steel case protector in front of the countershaft sprocket. When I move to 15, it doesn't fit. This is on a 1993 DR350 dirt model. Does yours fit with a 15?

Regards,

Gregory Bender
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Old 07-24-2010, 05:08 AM   #5290
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Quote:
Originally Posted by yondering
Well, I may have to apologize for being a moron. I forgot to check my quad carb last night, but some research online indicates the LTZ400 stock carb does not have an accelerator pump. It rides and acts like it has one, and there's a cover on the side of it that looks like an accelerator pump cover, but I've never pulled the air boot off to check; I've done all the tuning on that one by rotating the carb to access jets. The previous owner put in one of those "PowerNow" valves, so maybe it's not a pumper but that valve makes it feel like one?

I will verify this weekend if that carb is a pumper or not.

The same online research indicated that the Honda TRX450R does have a CV/pumper carb. It's a 42mm bore though so it may not be easily adaptable to the DR.
I did a little compare/contrast with the two images at Ayers. They're similar but not identical. The carb for the LTZ has a different, deeper float bowl and the throttle cable appears to connect differently. Also, you'll need the "dirt" (DR350) throttle cable(s) to use the BSR36 as the attachment point is on the right side of the carb. Waiting to hear what you discover.

Follow-up: It was a slow day so I did a parts list comparison of the two carbs. They're definitely different. The LT-Z carb has a "plunger assembly" while the DR-Z carb has a "starter valve". Both are located in the same approximate location, on the carb body, but are totally different assemblies. Right now, I'm thinking the DR-Z carb would be easiest to "bolt on" and go.
Quote:
Originally Posted by threefivezreo
Ok I verified my gearing 15/46. My question is what is a safe rpm to run at on hwy, or just higher speeds? 60mph=6000rpm as it sits right now. Is that ok? 70mph=7000rpm etc

and I'm on a 1997 SE
My '97 SE had 15/41 gearing from the factory. That would 'save' you some rpm at highway speeds and still keep it usable off road.
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Old 07-24-2010, 05:12 AM   #5291
Bronco638
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Quote:
Originally Posted by Greg Bender
Question: When I fit the 14, I can easily retain the half-moon shaped steel case protector in front of the countershaft sprocket. When I move to 15, it doesn't fit. This is on a 1993 DR350 dirt model. Does yours fit with a 15?

Regards,

Gregory Bender
When I swap(ped) c/s sprockets on my '99 (& '97), the SE case protector works with 13-15 tooth sprockets. I'm guessing the 'dirt' case protector is different.

EDIT: I checked the Ayers fiche for '93 DR350/S. There are two part numbers for the DR350 (27640-14D01, 27640-14D10) and only one for the DR350S (27640-14D01). You must have discovered the difference between the two.
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Bronco638 screwed with this post 07-24-2010 at 05:20 AM
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Old 07-24-2010, 05:20 AM   #5292
Greg Bender
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Quote:
Originally Posted by Bronco638
When I swap(ped) c/s sprockets on my '99 (& '97), the SE case protector works with 13-15 tooth sprockets. I'm guessing the 'dirt' case protector is different.
Thanks for the info. I'll pick up an "S" protector the next time I place an order for OEM parts. They aren't that expensive, < $10.

EDIT: Yep - You are seeing exactly what I am seeing in the parts manuals :>

Regards,

Gregory Bender

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Old 07-24-2010, 10:44 AM   #5293
MiteyF
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One more question. As the DR is my daily driver, I'm looking for a new chain and sprocket too, and 15/41 is actually exactly what I had in mind. I can find the sprockets, but how long should the chain be to fit this combo and still have good adjustment in either direction?
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Old 07-24-2010, 02:26 PM   #5294
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Quote:
Originally Posted by MiteyF
One more question. As the DR is my daily driver, I'm looking for a new chain and sprocket too, and 15/41 is actually exactly what I had in mind. I can find the sprockets, but how long should the chain be to fit this combo and still have good adjustment in either direction?
That's the stock gearing for the DR350se which the manual recommends 108 links. I'm currently running the same gearing with 108 links.

Quote:
Originally Posted by BikePilot
If you are nervous about it you could go to taller gearing. I have 15/41 on my 350 right now I think and that seems to be a pretty good compromise - allows fairly relaxed rpm on the road but low enough that the gearbox isn't too gappy off road. I was running a 16 on the front of my 350, but that was a bit tall for really technical off road work and made the jump from 1st to 2nd too great for tight trails. It worked quite well on the road though.
Where did you get the 16 tooth front sprocket? I've searched around for them and couldn't find one that would fit right.
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Old 07-24-2010, 02:34 PM   #5295
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Order one for a DRZ, it won't be listed for the DR350 as it won't quite clear the little case protector. A few minutes with a bench grinder fixes that though.

My 350SE case saver fit the 15T sprocket as that was stock. I relieved it a bit with a bench grinder to make room for a 16T sprocket.

My 250SE case saver didn't fit a 15T sprocket (I think the 250 came with a 14T stock). There are definitely different ones out there.

For chain length I always just order a standard length (120 usually) and cut to fit. I'm much too lazy to go and count out links:)
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