Stuttering & four stroking

[Lambretta67]

How come the hot weather doesn't affect my p200

[coaster]

How come the hot weather doesn't affect my p200

Quirk of the engines setup Id say, changes in altitude will affect the air fuel ration too.

[Lambretta67]

How can I stop it doing it.

[MightyGem]

Could someone explain "four stroking" for me please. Never sure of what it means.

[Lambretta67]

I used the expression to mean the scoot was stuttering & running a bit erratically but it probably doesn't mean that. Sounds good though. Makes me sound like I know what I'm on about.

[hat]

How come the hot weather doesn't affect my p200

Could be his engine is marginal in ideal conditions, so any change like the hot weather immediately makes a difference. Or it could well be worn carb components

4 stroking generally means its over rich and the engine sounds like its making 2 beats for each engine turn rather than 1, making it sound harsh and rough. It usually smooths out with more revs and in higher gears

[Lambretta67]

Exactly what the scoot is doing

[coaster]

4 stroking usually occurs when you back the throttle off slightly and it sounds like a machine gun. Its actually firing every other stroke like a 4 stroke motor hence the term.

[Lambretta67]

I might be being a thick but what does marginal in ideal conditions mean & how do I sort it. Cheers

[Daggs]

Some years ago I built an Imola kitted scooter. In the Winter it flew along happily. But when hot Summer days arrived it would splutter in mid-range. I spent time changing the Atomiser and needle position (several times) until it just stopped spluttering in Summer. I found the next Winter, it still ran O/K.