operating temps

[mmeadows]

As we all know these Honda two strokes overheat, and Honda had zero interest in giving us a gauge to let us know, or telling us an operating temperature in there manuals.
So I am trying to re jet my aero50 but I donÔÇÖt know how to tell IÔÇÖve found the "sweet" spot. There are a few posting on this form in unrelated areas but no general agreement.

1. What are normal operating temps?

2. How long should it take to heat up to normal operating temps?

3.) How hot should an engine get at WOT?

4. What is the ÔÇ£danger zoneÔÇØ temp?

I have read a few thing that I question their validity but its all I have to go off of. (1.) your engine wonÔÇÖt have any power unless youÔÇÖre getting above 280 degrees (2.) you should reach 360 degrees at wot and (3) 350-370 is the danger zone.

I have a uni filter and a leowincve exhaust. so far I have tried re jetting to a 102,108,112 but as I donÔÇÖt know where I should be with temps, all I am able to determine right now is "runs" or "doesnÔÇÖt run" or ÔÇ£ runs slowlyÔÇØ

I know this problem would just go away if I had a stock air box but thatÔÇÖs not an option, this is an 87 aero engine in an 84 aero frame. No stock air box will clear the combination of different year electrical box or shock absorbers.
So if I canÔÇÖt make this uni filter work, I will have to trash the moped.
Please help

[mmeadows]

[abreen89]

you use plug chops... Get a couple spark plugs do some wide open throttle runs when the plug looks like it should your jetting or setup in general is good. start with a high jet so you dont risk running to lean

here is the link http://hondaspree.net/wiki/index.php5?t ... Plug_Chops


FYI: why would honda need to give you a heat gauge or proper working temp. IF its stock and you dont f*** with it it will work just like it should.. OTherwise you need to add an aftermarket gauge....

[mmeadows]

I do have an aftermarket gauge that is why I want to know what to look for. I'm hoping to avoid doing a plug chop. A lot of quads and dirt bikes have gauges.

[Wheelman-111]

Greetings:

Quoth MMeadows:

As we all know these Honda two strokes overheat,

I must disagree. Particularly if left stock, you can run an Aero, Spree, or Elite Wide-Open all day long and never have a problem.

and Honda had zero interest in giving us a gauge to let us know

Every time you add an accessory, you add to the cost. Honda couldn't have sold them as cheap as they did if they added pricey gauges, anti-lock brakes, air-bags... The scooters sold for under a grand, so don't expect refrigerated cupholders either.

There are a few posting on this form in unrelated areas but no general agreement.

Heat-resistance of a particular bore depends on many factors. The quality of the material is a big one, as is the quality of the machine work and matching of the piston dimensions to those of the cylinder. One other thing to consider is the thickness of the cylinder wall. Personally I've come to believe that the thinner that gets, the more sensitive the top end becomes to heat. This results from my experience with a Bullet-proof Nicasil 49 and Corsa 47mm, a little more-sensitive 50mm, and two Fried 51s I've built. They blew up with 375 showing on the gauge, so it's hard to be too categorical. With that in mind, a stock cylinder has an awful lot of protective "Meat" on its walls.

1. What are normal operating temps?

I'm only guessing, because most modders don't get around to installing a gauge until they've added a cylinder. 325-400?

2. How long should it take to heat up to normal operating temps?

'Smokers heat up quickly. Probably by the end of your city block in summer. Maybe twice that in near-freezing weather.

3.) How hot should an engine get at WOT?

375-400 on a stock cylinder.

4. What is the ÔÇ£danger zoneÔÇØ temp?

I start to sweat if my own gauge goes over 400, but Nicasil 49 got to 550 one time after a downhill coast. Never saw a scratch on piston or cylinder, but YMMV.

I have a uni filter and a leowincve exhaust. so far I have tried re jetting to a 102,108,112 but as I donÔÇÖt know where I should be with temps, all I am able to determine right now is "runs" or "doesnÔÇÖt run" or ÔÇ£ runs slowlyÔÇØ

I know this problem would just go away if I had a stock air box but thatÔÇÖs not an option, this is an 87 aero engine in an 84 aero frame. No stock air box will clear the combination of different year electrical box or shock absorbers.
So if I canÔÇÖt make this uni filter work, I will have to trash the moped.
Please help

For general guidelines, Abreen gave good advice. Those numbers are from my own specific experience

[abreen89]

I do have an aftermarket gauge that is why I want to know what to look for. I'm hoping to avoid doing a plug chop. A lot of quads and dirt bikes have gauges.

yes but since you cant run the right airbox your going to be running lean just start with a high jet and work your way down with plug chops temperature isnt going to tell you everything you need to know....