got an engine

[THE HUNTER]

lol cant be as bad as a rotary with a straight pipe... but even with the muffler it sounds bad ***.

when you say "rotary" are you referring to a rotary engine, like a Wankel, or simply a rotary mower, where the blade spins underneath (the kind in the pics you posted)?
if you dont specify it can get kinda confusing, as this thread is about a lawn mower engine lol



i should put a straight pipe on my mower to do some grass today, just to see how it works.. and if i loose my hearing lol

 

[Rotore]

when you say "rotary" are you referring to a rotary engine, like a Wankel, or simply a rotary mower, where the blade spins underneath (the kind in the pics you posted)?
if you dont specify it can get kinda confusing, as this thread is about a lawn mower engine lol



i should put a straight pipe on my mower to do some grass today, just to see how it works.. and if i loose my hearing lol

rotary as in wankel like a 12a, 13b, 20b and the r26b they come with the ear bleed factor lol i own 2 of them...

but it would be kinda cool having a rotary go kart tho...

 

[Rotore]

well i took off the carb and cleaned it up, i noticed that the carb is plastic but thats not the point it idles fine now but at open throttle it revs up and down then gives one huge rev then keeps on revving up and down. im stumped...

 

[Rotore]

more pictures

 

[Affair_driven]

Surging almost always means engine is running lean.
Try partially choking carb while engine is surging to see if it smooths out.

 

[Rotore]

Surging almost always means engine is running lean.
Try partially choking carb while engine is surging to see if it smooths out.

explain dude... do u mean partially covering the carb?

 

[THE HUNTER]

explain dude... do u mean partially covering the carb?

most carbs have a manual choke that you apply to start the engine, but this kind of carb has an automatic one that opens with a bi-metal spring. when the air coming outta the crankcase breather warms up, the choke slowly opens.

so yeah, get the engine running, then partially cover the carb with your thumb.

 

[Rotore]

most carbs have a manual choke that you apply to start the engine, but this kind of carb has an automatic one that opens with a bi-metal spring. when the air coming outta the crankcase breather warms up, the choke slowly opens.

so yeah, get the engine running, then partially cover the carb with your thumb.

it's still going at it i'm just going to take the carb and rebuild tomorrow in school...


on the other hand when the engine starts is it suppose be at full throttle?

and is there any way to put a tach. on this engine? if so how?

 

[THE HUNTER]

in the pictures you posted you have a throttle control on the mower. so if the engine is warm, it should really start at any throttle setting.
but generally, yeah. they usually like to be started at full throttle.

and do you mean a tach to just test what speed its running at, or a tach to leave on the mower?

there is really no need for the second option on a mower like this, so i assume you mean to test its running/idle speed lol.
you can get hand-held ones at Harbor Freight for around $40.
you can also try looking on e-bay or other online stores.

 

[Rotore]

in the pictures you posted you have a throttle control on the mower. so if the engine is warm, it should really start at any throttle setting.
but generally, yeah. they usually like to be started at full throttle.

and do you mean a tach to just test what speed its running at, or a tach to leave on the mower?

there is really no need for the second option on a mower like this, so i assume you mean to test its running/idle speed lol.
you can get hand-held ones at Harbor Freight for around $40.
you can also try looking on e-bay or other online stores.

yea it's just for testing purposes...

wish i could just throw a 12a or 13b on the kart lol... :arf:

other then that i regapped it to .12 and got a way bigger spark then at .10