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Old 04-18-2011, 10:49 AM   #47701
N.dica
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I feel like this is about to be the dumbest question ever, but where does the "reserve" come from on the 4.9 IMS petcock? Within the tank is just a filter tower for the fuel to enter the primary fuel line, but there is no tube or anything I notice bringing fuel from the other side of the tank. I'm confused. I feel like turning the knob to reserve wouldnt do anything.
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Old 04-18-2011, 11:01 AM   #47702
mobe
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Quote:
Originally Posted by wfo600 View Post
Hey all, new question from a new dr650 owner. Just bought a po 2005 that was really well taken care of, super nice overall and I love it! However, the side stand rubs against the side of the swingarm (when up obviously) and is making a groove in the aluminum. I removed the sidestand and pressed the "U" where it mounts to the frame together to take out some of the play and it worked initially, but bent right back to how it was before after a day or so. Is this a common problem? Any ideas or aftermarket solutions to keep the sidestand out and away from the swingarm? Thanks, it was the 3000+ posts on this thread that convinced me the DR is for me and I couldn't be happier
Do this.
Put side stand down.
On left side of bike using the rear grab bar and handlebar, pull the bike up onto the sidestand so that the rear wheel is off the ground.
Stand on your left foot.
Place your right foot on the left footpeg.
Give a GOOD push.
TA DA.
Go have a beer!

This also takes care of that, "my bike stands too upright on the sidestand", thing.
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Old 04-18-2011, 11:34 AM   #47703
pjensen641
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Quote:
Originally Posted by devriescharles View Post
Found a FCR-MX for 100 dollars. Think it is worth buying up? I dont really know what people are getting for them. Have read over robs install and would like to here if people are having good results with the mod with out horrible gas mileage hits? Any ideas of how much more money it will take to get it all set up for the dr650? Thanks
Its all in how you jet it. I get 50-55 MPG. I don't baby it but also rarely cruise at 70+ for long distances. Jetted correctly, there is no reason why you should get worse economy. Also don't see any altitude issues, but I do make a slight needle position adjustment if I am going to be >5000 ft for long periods...just makes the fuel economy better but I don't think there would be a drivability issue if you did not.

The engine doesn't care what carb is on the bike. The correct F/A mixture for any given condition is always the same. So there is absolutely no reason that a carb change alone should affect fuel economy assuming that the jetting is perfect on both. The BST and FCR should hit the same fuel delivery at steady state cruise assuming jetting is correct. However, the FCR is miles better in fuel delivery during transitions and lower RPM operation due to no vacuum slide flutter and the AP's ability to deal with the surge of fuel needed when the throttle is cracked. Actually, the FCR can be jetted leaner at cruise than the BST, because the BST has to be richer than perfect so you don't get a huge lean stumble during acceleration due to no AP fuel squirt.

Now, a few reasons why you can see worse economy...
-Its more fun to crank they throttle and pull wheelies than with stock..so you do it more.
-With the accelerator pump...if you don't have a steady throttle hand and constantly vary throttle...you may take a bit of a hit. Each twist of the wrist squirts fuel in. Not saying you have to be steady as a sniper...but I have seen many people who cant even drive a car down the highway without constantly moving the accelerator (speed up..slow down..speed up ..slow down etc). Normally those are the fools who show a complete lack of ability to pay attention to what they are doing.

As far as conversion cost...Procycle has a "MX ROB" FCR kit. You can get the basic kit with one set of jets for $25 and a full kit with several more mains to adjust for altitude and other mods, an extended screw, and the required AP spring for $75. Only remaining thing is the air boot adapter..which may run $50-100 depending on who you can find to machine it.
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Old 04-18-2011, 12:55 PM   #47704
shu
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Location: Colorado
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Quote:
Originally Posted by N.dica View Post
where does the "reserve" come from on the 4.9 IMS petcock? Within the tank is just a filter tower for the fuel to enter the primary fuel line, but there is no tube or anything I notice bringing fuel from the other side of the tank. I'm confused. I feel like turning the knob to reserve wouldnt do anything.
There is no tube from the other side of the tank and there is no separate 'reserve tank'. As I recall, the 'main tank' feeds down to the top of the tube above the petcock. When you switch to reserve you open up a hole at the bottom of the tube.

There will always be some fuel (~ 0.5 L) remaining on the right side of the tank that you can't use unless you tip the bike over. I don't usually do that because that low spot in the tank is also where sand and crud in the gas collects. It's easy to see that in the natural colored tank.

..............shu
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Old 04-18-2011, 01:15 PM   #47705
Adv Grifter
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Quote:
Originally Posted by shu View Post
There is no tube from the other side of the tank and there is no separate 'reserve tank'. As I recall, the 'main tank' feeds down to the top of the tube above the petcock. When you switch to reserve you open up a hole at the bottom of the tube.

There will always be some fuel (~ 0.5 L) remaining on the right side of the tank that you can't use unless you tip the bike over. I don't usually do that because that low spot in the tank is also where sand and crud in the gas collects. It's easy to see that in the natural colored tank.

..............shu
Good stuff Shu!
Be aware the IMS does not give you much reserve ... about 10 to 15 miles?
Once you run dry ... as Shu says ... you can tip the bike over getting gas from that right side lobe over to the left. Good for maybe 10 more miles if you're lucky.

Fuel line routing and the addition of in-line filters can also effect range. YMMV.
I run no in line filters and do a "loop" with the fuel line. My metal fuel inlet tube has been rotated from stock 12 O'clock position over to
9 O'clock position. Seems to allow the use of almost ALL the fuel in IMS tank.
Before I did this bike would run dry (after using main tank and reserve) but there was still about 3/4 of a gallon left in the tank.

Now, when reserve runs dry there is only about a pint left in tank. 240 mile range.
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Old 04-18-2011, 01:25 PM   #47706
IdahoRenegade
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Location: Sagle, Idaho
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Hi All,

I'm looking to pull the trigger on a set of Shinko 244s. I'm new to sorting out tire sizes. Can you confirm sizing, I'm looking at the 3.00-21 front, 4.6-17 rear.

Thanks
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Old 04-18-2011, 01:39 PM   #47707
NordieBoy
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Location: Kiwiland
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Quote:
Originally Posted by Adv Grifter View Post
Good stuff Shu!
Be aware the IMS does not give you much reserve ... about 10 to 15 miles?
Once you run dry ... as Shu says ... you can tip the bike over getting gas from that right side lobe over to the left. Good for maybe 10 more miles if you're lucky.
What tap are you running?
I'm getting about 30km from reserve.
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Old 04-18-2011, 02:14 PM   #47708
Mongle
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Location: North Carolina Y'all
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Quote:
Originally Posted by NordieBoy View Post
What tap are you running?
I'm getting about 30km from reserve.

What is a TAP? Translate that to terrible american english please

I use the IMS petcock- about 210-215 miles on main tank then about another 25 miles on reserve. She is pretty dry by then!
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Old 04-18-2011, 02:16 PM   #47709
Emmbeedee
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Location: Near Ottawa, ON, Canada
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Quote:
Originally Posted by Mongle View Post
What is a TAP? Translate that to terrible american english please

I use the IMS petcock- about 210-215 miles on main tank then about another 25 miles on reserve. She is pretty dry by then!
TAP = Petcock
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Old 04-18-2011, 02:59 PM   #47710
12ARX
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TAP
  • A valve and spout used to regulate delivery of a fluid at the end of a pipe.
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Old 04-18-2011, 04:00 PM   #47711
rockmurf
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Props to Seat Concepts

I purchased a firm seat concept for my dr and it did not work for me. I advertised it in the flea market and the good people at seat concepts said send them the seat and they will swap the firm for the soft. I sent the seat and they gave me new foam and cover and installed it and shipped it back to me on their dime. I must say I have high expectations when I give people my money for something and most of the time I am disappointed but this goes beyond anything I would have ever expected and if you deal with seat concepts you will be a happy customer. A tip of the hat to seat concepts.
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Old 04-18-2011, 04:20 PM   #47712
eakins
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Location: Fort Collins, Colorado
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Quote:
Originally Posted by Adv Grifter View Post
Excellent explanation!
Getting the mixture right will also make for better starting, smoother idling ... and best of all ... will save fuel. Running the fuel air mixture too rich wastes a lot of fuel on the overrun. (Like down shifting, shut throttle)

I turn the mixture screw IN (clockwise) until idle begins to stumble ... then back it out just until stumbling stops ... usually no more than 1/8 turn out from stumble point. I don't mind a bit of a rough idle, saves gas.

At high altitude lean it out even more for proper idle and better starting.
that is traditionally true with CV carbs but i have found (as many others) that tuning it that way produces an off-idle bog. i've turned my screw back to 1 turn out and the bog is gone...this setting does not produce the best idle but the engine runs better because no bog...
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Old 04-18-2011, 04:21 PM   #47713
Mongle
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Quote:
Originally Posted by 12ARX View Post
TAP
  • A valve and spout used to regulate delivery of a fluid at the end of a pipe.

The only pipes I have on my bikes are exhaust...and no taps on them. While I do have "hoses" for gas...maybe that is why I use a petcock!

Just messing with you guys. After I wrote it I kind of figured it out. Thanks though.
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Old 04-18-2011, 04:37 PM   #47714
12ARX
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Quote:
Originally Posted by Mongle View Post
The only pipes I have on my bikes are exhaust...and no taps on them. While I do have "hoses" for gas...maybe that is why I use a petcock!

Just messing with you guys. After I wrote it I kind of figured it out. Thanks though.
Quite common in Oz and kiwi land and even the UK to refer to the "petcock" as the "tap" matter of fact I had never heard someone call it the "petcock" until I came on here.
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Old 04-18-2011, 04:52 PM   #47715
BergDonk
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Fcr

I went with the FCR because I've used them before on my Bergs and played with them on other's Yams. I used MXRobs specs as a starting point and have leaned it off a bit. Maybe our fuel is different, and I'm at 800 m. Really wakes up and smoothes out the power delivery, and no impact on consumption for me. MXRob can supply a bellmouth adaptor too if you email him. Details in the link in my sig.

For mostly cruising though its probably not worth the expense over a properly setup BST40. As the terrain gets more technical, the benefits are appreciated more and more, like suspension, but just putt around and there is not much point.

Steve
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