Is WR426 overflow bottle needed???

9 replies to this topic
  • wr426

Posted September 24, 2002 - 06:07 PM


Do I really need to keep htis heavy overflow bottle on my wr I never notice it getting hot with it on their?? I figure it might save a pound or two if i take it off. Thanks for any Advice,jim

  • SealClubber

Posted September 24, 2002 - 06:56 PM


I have used mine a couple of times. But the trails I ride can be slow and rocky. YZ's don't have one so you probably don't need it.


Posted September 24, 2002 - 07:24 PM


WR426, you probably can get away without it but, why? I think that overflow bottle is great. I wish I had one on my KTM. The amount of weight you would save by getting rid of it is trivial. In my honest opinion, I think the advantages of having it outweigh the minscule extra weight added. Just my .02 cents.

  • StreetMoto

Posted September 24, 2002 - 08:04 PM


Not to say that you need or dont need the overflow bottle but there is a definate weight to it. Remember, the overflow bottle may only weigh 3/4 of a pound but a gallon of water will weigh in at a little over 8 pounds! It all adds up.

BTW, Ive been running without my overflow sense my bike was new. Ive yet had to put any water in it.

  • ddialogue

Posted September 25, 2002 - 02:07 AM


It really depends on what type of riding your doing. If you're riding a lot of fast stuff then I would say take it off. However, if you're riding a lot of slow stuff or you ever ride dunes then I would say leave it on. My 02 is always slurping coolant in and out of it.

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  • Kevin_in_New_Hampshire

Posted September 25, 2002 - 02:48 AM


Slow plonking WILL overheat your bike >> the reservoir is nice insurance to have. For fast riding and/or cool temps you are all set >> remove it.

If you remove your overflow indefinitely, you can install a YZ side panel (on the left side >> It is sleeker and does not protrude so much.

I carry maybe ~< 1 qt. in my overflow.

Water weighs 8#/gallon.
Salt [sea] water weighs 8.8#/gallon.
Coolant is somewhere in between.

>> We are looking at 2# + hose and bottle weight.

  • Highsider1

Posted September 25, 2002 - 03:27 AM


If you remove it, do you need to replace the radiator cap? My guess is that the YZ has a different cap that does not allow coolant to flow out.

Personally, I would'nt remove it. My '02 will overheat in a couple of minutes if I leave it running while waiting for the trail to clear ahead of me, or while waiting for others to catch up. If you do remove it, I would recommend that you kill the motor whenever you need to stop for, say, more than 1/2 minute. As far as the weight, minimal. I did'nt check, but my guess is that when the tank is a proper level, less than a pint of coolant is present.

My opinion is that it is excellent insurance against expensive engine repairs.


Posted September 25, 2002 - 04:54 AM


All Caps (Including the YZ) allow for venting, If not your Rad's would explode when over pressureized.

Bonzai :)

  • SFO

Posted September 25, 2002 - 05:27 AM


Originally posted by wr426:
Do I really need to keep htis heavy overflow bottle on my wr I never notice it getting hot with it on their?? I figure it might save a pound or two if i take it off. Thanks for any Advice,jim

I see you are from roseville.
If you ride foresthill it will be 50/50 that you need it. Personally I swapped the subframe out and just run a 1.8bar rad cap off of an '01 kx65.
I haven't had any boil over issues but the catch tank is good insurance.

  • AZWR426

Posted September 25, 2002 - 08:13 PM


Do a search. I can't count the number of threads from guys that took it off and had problems....


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