How hot should an engine run???

[tyman]

i was just out riding my 86 200x... i just put a new uni filter on it, new sprockets, and new bearings front and rear... after i was done riding, i couldn't touch the side cases or the fill plug it was so hot, after getting a rag to pull out the oil fill plug, the oil was so thin, it literally ran off the stick... i used castrol black cap (i think its 10w40) and about 2 or 3 oz. of lucas oil treatment, which is super thick... i only rode it for ~30 minutes... so how hot should it be????

[Liquid-Darkness]

I don't think any engine will be toutchable after 30 mins of riding. I find that 20/50 is a great oil for all riding conditions.

[Bryan Raffa]

the lucas might have plugged something up that stuff is thick and should only be put in a hot motor. try changing the oil again after its warm. It should not be so hot that you cant touch the case or filler plug.

[Somekindofjerk]

It should be warm yes, but not hot to the point where you cant touch the sidecases or the plug. Is your oil synthetic?

[tyman]

nope just regular oil.... and yeah it was really hot... it ran fine though... i was thinking about that new filter.. it draws alot more than the old 125m filter i had stuffed in it... could it be that the mixture is way to lean??? and its getting very hot?

[diggerzmound]

Air Cooled engines can run in excess of 300 degrees. Keeping it moving is the best bet, idling can cause overheating.

[Beardoh]

nope just regular oil.... and yeah it was really hot... it ran fine though... i was thinking about that new filter.. it draws alot more than the old 125m filter i had stuffed in it... could it be that the mixture is way to lean??? and its getting very hot?

Thats what happened to me when I changed from the stock air filter to a UNI on my 185S. I'ed try doing a plug chop test, because if its that hot your probobly too lean.

[SYKO]

also did you rejet for the UNI filter, a lean condition will overheat your motor as well

[tyman]

i'm going to do a plug chop tomorrow, and then raise the needle clip.. i guess that makes it richer right???? hopefully that'll solve it, cause my dad refuses to let me buy jets... he says they are "a pain in the @$$" .... but then again, since when do i actually listen to what i'm told???? anyone know what kind of jets a stock keihin 200x carb takes??? their are so many different series... and how do you tell what size the one in it is????? thanks

[boonis]

a lot of people put these on to tell if there runing to hot http://www.cvproducts.com/cv/product...09&brandID=197

[SYKO]

boonis those work well on a liquid cooled motor but surface temps on air cooled motors can be much more than that, tyman, do you have an airbox lid on? that will richin it back up a bit, raising the needle will help and screwing IN the air/mix screw will help, but to help on top end throuttle you will need a bigger main jet.

[deathman53]

I have only seen kehien jets and mukuni jets. I used rugular kehien jets in my 200x carb. I think I had a 125.

[deathman53]

correct me if I'm wrong, but lowering the needle clip riches it and raising the needle clip leans it.

[SYKO]

ooops I read it wrong my bad, yea if you raise the needle clip that leans out and if you lower it richens it

[tecat-z]

My liquid 85 t3 runs at 155 according to my ESR billet gauge. I know you are not liquid, but, this is just for reference for other liquids out there. I can also tell you that in the summer after a good beatin when its humid, the clutch cover feels a lot hotter than that to me. Remember, as outside temperature rises jetting becomes richer and vise versa. Bump up the main a bit when cold and it may cool it down a bit. Four strokes are much more forgiving than our two strokes in the cold so dive in and show dad you what you've learned.