Honda NSR 125 cooling too good?

Irongamer727 · Derestricted Danger Joined: 17 Mar 2018 Karma :

It's always just over the blue mark. I would want it in the middle, between the red and the blue. I've looked around a bit and can see that most of these machines run very cold.
I just find it hard since it's a 20 gear old 2 stroke.
Sounds plausible?

I think a photo should be attached here and it shows roughly where the needle points. It's just at end of the blue. On it's way up.

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

What problems are you having on this 20 year old bike?

Irongamer727 · Derestricted Danger Joined: 17 Mar 2018 Karma :

Perhaps that the temp gauge is malfunctioning? It could of course be plausible that these engines run at a cool temperature, or my gauge could be wrong. But I won't know until someone confirms either option.

I could drain half the coolant and check for am increase in temperature but it feels a bit extreme.

stephen_o · Spanner Monkey Joined: 02 Aug 2011 Karma :

Check your thermostat is not stuck open. I have had this problem on old cars, vans and the old GPZ500 which went through a spell of being shut open (in the winter) and then shut stuck (in the summer) until the cooling fan rotted and siezed rendering the bike to come close to boiling over.
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current scoot 2009 Yamaha YBR250 + Current Pootle 2013 Nissan Leaf

Irongamer727 · Derestricted Danger Joined: 17 Mar 2018 Karma :

Sadly I don't think that's the "problem". The bike gets up to the given temperature fast. But then it stays there. So I don't think there is any issue with the thermostat.

jaffa90 · World Chat Champion Joined: 06 Apr 2016 Karma :

i DON`T THINK YOU HAVE A PROBLEM.

stephen_o · Spanner Monkey Joined: 02 Aug 2011 Karma :

I don't think you have a problem either, when my GPZ was running right the temp gauge used to climb to almost half way then as the thermostat opened it would drop back and settle at just passed the cold position and unless stuck in traffic thats where it would stay, It had to be running for 10 mins before it got hot enough for the fan to cick in.
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current scoot 2009 Yamaha YBR250 + Current Pootle 2013 Nissan Leaf

skatefreak · World Chat Champion Joined: 06 Feb 2010 Karma :

Not a problem, rode a 2001 NSR for 4 years, just above the blue line seem's to be about right. If you find yourself stopped/crawling in the middle of summer you'll see it move Thumbs Up

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Fin · World Chat Champion Joined: 27 Feb 2016 Karma :

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

The gauge is unlikely to be linear, so this is a pointless excercise.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

elliottk94 · L Plate Warrior Joined: 16 May 2018 Karma :

New to the forum so try to go easy on me Confused

I've had two NSR 125's now and my temp on both has never really moved much unless I left/leave the bike idling for 20 minutes or when slow riding in hot weather. Seems to cool very quickly when picking up a bit of speed too and generally sits just above the blue too. I don't think you have anything to worry about.

My first NSR125 (about 6 years ago) had a heating issue after downsizing the engine (I unknowingly bought it with one of those Anthena 190 kits) and the temp of the bike went right up to the red at one point. Shocked

Going off topic slightly here but does anyone have Alains NSR tips document? Tried sending him a message but not had a response as yet! Sad