How hot is too hot?

[daveyf]

Hi,


recently rebuilt my 125 dl with GT 186 kit. Done about 300 or so miles and all running well. Timing 17 btdc, b8es plug. Spark plug nice and dark. Re-torqued the cylinder head. The thing is the engine casing and rear hub feel way too hot. Too hot to touch when I have been out for a spin. Toolbox feels hot as do the contents. Now maybe I have just never taken much notice of the engine before I rebuilt it but is this just tooooo hot or am I being paranoid?? Appreciate any advice.

[bazza3004]

hi sorry i dont have an answer but i have the same kit and thought my engine mounts seemed quite hot after a run , but after around 600 miles it hasnt caused me any problems. ps. i also hadnt noticed if they were getting hot previous to putting the kit on either.

[Grumpy225]

I know it sounds weird but running too rich can cause a hot condition with the motor. Get the jetting dialed in correctly, light coffee/cream colored plug and the engine will run cooler.

[Donnie]

And leaner!

light coffee/crem colour is to us on this side of the pond a Rich Tea Biscuit colour and IMHO too light, I prefer (and always advise) being closer to the Bourbon end of the Biscuit scale.

[RICSPEED]

[paul213]

I prefer between dairymilk (good) and bournville (a little rich) also when the air gets cooler and denser in winter it will be leaner still

[tonydevon]

rich tea biscuit colour, hmm is that plain or chocolate rich tea?

if its chocolate, then what side of the biscuit

I try to aim for jaffa cake colour

[Donnie]

rich tea biscuits are only one colour?

[daveyf]

Well I must say I am impressed by the depth of biscuit related knowledge on the forum. I have taken your advice and been carrying a range of biscuits in my toolbox from custard creams right through to plain chocolate hob nobs. The trouble is when I stopped to check my spark plug colour against my biscuit selection they had all melted in to a gooey mess. Does this mean my engine is still running too hot?

[GP240]

^^nice one Dave, but am sure you get the picture^^

at least you have noticed it's running hot at mo, you could back timing off a little say to 16/15 an see if that helps ?

you not mentioned if it's a complete engine rebuild or just top-end ?

carb same/exhaust ?

if you have noticed it being hot then chances are it will let go (holed piston/seize) as I have learned haha. hmmmm biccy n a brew yam yam.