How to stop overheating??

I installed a temp gauge and up jetted carb from 90 to 94 and it still gets pretty hot. Any tips?

Re: How to stop overheating??

Brent Bublitz /

Does it have gas in it?

Re: How to stop overheating??

Yes?

Re: How to stop overheating??

i always upjet when i install a temp gauge......

Re: How to stop overheating??

Brent Bublitz /

I'm shocked the temp gauge didn't keep it cool. Mine won't break 350 with one installed.

The point of the snark is that you have told us nothing useful to help you diagnose your problem. What motor, what bike, what mods, what's your timing. Need to know it all.

Re: How to stop overheating??

Brent Bublitz /

Without looking, I'm guessing you have a Tomos.

Re: How to stop overheating??

I upjetted because I overheated befor I got temp gauge

Re: How to stop overheating??

I have a honda nu50 (urban express) and I have the dr 70cc kit installed ( still breaking in), circuit pipe, timings correct. 94 main jet with a hi flow filter

Re: How to stop overheating??

simon thokaar /

oil injector or premix? injector might not be working properly or you need more oil in the premix. If injector disabled did you block off all the lines.. could be drawing too much air. Id just keep upjetting til you hit a temp you like and the bikes not getting flooded.

Re: How to stop overheating??

What is the compression number?

Re: How to stop overheating??

And what do you consider to be overheating?

Re: How to stop overheating??

and what size carb ?

94 is fat.

Re: How to stop overheating??

Downhill Harvey (OFMC) /

I told ya not to kit so soon, breaking 30mph yet?

Re: How to stop overheating??

What temperature is "pretty hot". Is it like "pizza pocket hot"? "I just welded this and probably shouldn't touch it hot"? "Lava hot"?

Re: How to stop overheating??

Stock carb, I know not ideal but it's what I got for now

Re: How to stop overheating??

Did I before kit? Or now.

Re: How to stop overheating??

Overpriced Parts /

Retard timing if jetted correctly

Re: How to stop overheating??

Downhill Harvey (OFMC) /

^^^CDI, can't

Re: How to stop overheating??

Overpriced Parts /

Downhill Harvey Wrote:

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> ^^^CDI, can't

Get a different box if possible .

Some cdi stators move

Re: How to stop overheating??

Downhill Harvey (OFMC) /

^^^you should try an Urban, you might like it.

Re: How to stop overheating??

Represent NU50!

Re: How to stop overheating??

what head? either air leak or compression too high. Did it soft seize from heat?

Re: How to stop overheating??

#CrazyWayne™ rocks. #CrazyWayne /

Mars™   Wrote:

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> And what do you consider to be overheating?

The overheating test is black oil under the piston dome.

On stock honda head's don't freak out till you hit 445f.

Honda, pug's and moby's are fine with WOT head temps running 410 to 440f.

Your loosing power till your at least 380f,

400f to 430f is the wot range you want, if your tune is golden.

Re: How to stop overheating??

Ya it did

Re: How to stop overheating??

it could be an airleak where the decomp passage on the kit and gasket hits the urban head, see the pic, or maybe too lean with the high flow filter. my urban with kit & circuit was happy with a 95 jet and the stock airbox. you running premix or injector? try amsoil saber at 80:1

P1010117.jpg

Re: How to stop overheating??

Heat comes from:

too much compression (Over 9:1 corrected compression ratio on an unpiped bike, over 15:1 Uncorrected compression ratio on a piped bike)

Incorrect combustion chamber shape (Squish band too wide/wrong angle/too much squish clearance)

Too much ignition advance (Varies by bike)

Running too lean/hitting a lean spot in your Carb setup

Insufficient cooling (Almost always a problem on Hobbit derivatives)

Re: How to stop overheating??

Follow Max's check list - since your making this a mystery for us I would just throw liquid nitrogen directory into flux capacitor

Re: How to stop overheating??

i hit 425 today

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