Should I choose cold or hot spark plugs?
this is one of those areas that people just dont seem to understand…the heat of a plug has nothing to do with the flame in the cylinder. they dont make an engine run any hotter or colder than it otherwise would.all it signifies is how hot the plug itself gets in operation.a COLD plug suits a HOT engine. which is why you see more and more new vehicles with high numbered plugs, such as ngk **11** or **13**, as they run lean, and hot.a HOT plug suits a COLD engine… which is why lawnmowers use low number plugs, using ngk again… numbers such as **5** or **7**.a hot plug holds heat, retains it. it gets hot. which is good for an engine that runs slowly, or a twostroke that has to burn oil off its insulator and electrodes. if the engine is tuned correctly but plugs come out dark brown to black…get a hotter plug. if its a generator that spends most of its life putting away at 3000rpm…get the hotter plug.once the electrode starts melting and the insulator comes out bone white or even blistered…its TOO hot. (or, as ive found with some engine/plug combos, you get seriously bad pre-ignition…)with the exact right plug heat range, and a perfect tune, the plug comes out looking virtually “as new”. white, or just a shade of tan.if the engine is used at full throttle, all day long, in tropical heat… get a cold plug.you will usually find manufacturers list two, sometimes three plugs as suitable, with a small note saying that the “8 is suitable for inner city use” and the “9 or 10 is more suited to racing or high load use”
Aprilia Rs125 had seized engine?
When an engine seizes it does not feel as if it has run out of fuel, the piston literally stops in the cylinder and can be quite dramatic. If it felt like it ran out of fuel there is probably a cheaper explanation to do with fuel/air supply or spark/electrics.
My aprilia rs125 wont start sometimes!?
Hello, Basiclly My Aprilia rs125 Has had an engine rebuilt and i have gone atleast 350m miles with it since i had bought it from the private previous seller i have had it for a few days and whenever it is cold it would not start up at all... and also when the petrol runs out we have to jump start the bike for it to start up, sometimes it turns on perfectly but it can never maintain stayin on without revving the bike so if im at traffic lights and in first gear i have to keep revving or it will stall. sometimes in neutral i dont have to rev it but sometimes i do for it to stay on also the about the fuel tap it has to be upside down for it to work if i put it the correct way round it wont turn on i think not enough petrol is going through the tank how can i fix my problem ?
How can I de-restrict a Genuine Roughhouse 50?
they did it for me and im 16. But its easy to do. Theres a little spacer or washer in the clutch that wont let it open all the way. they took that just out, and they took the baffle out of the muffler also.
If I took off the catalytic converter, will it make my fuel get better mileage?
Don't listen to the naysayers. A engine is a pump, anything you do to increase pump efficiency, is going to increase gas mileage. A new cat will not rais fuel consumption much, But if it has over 100,000 miles on it, You will see a marked increase or “restoration” of gas milage. This is especially true of cars with a secondary air pump. They are not exactly filtering the air, before its pumped into you exhaust.This is what gets fun. If you reprogram, or modify the O2 sensors signal to bring the engine to stylometric fuel ratio or just less, you will get a 5–10% increase in gas milage. This trick really shines in stop and go traffic. If you analyse the wave form of the upstream O2 sensors, you will notice it spends a lot more time rich, than lean. You are sitting at red lights feeding that Fat Cat, so it can make more smoke.All cars are set up to fuel that catalytic convert. This keeps them hot and working. Without extra fuel pumped thru the engine, that cat has nothing to do, cools down, and slowly plugs up. To bad your cat will plug up if you lean out the engine. Hint, Hint……….
Bike wont start but backfires?
So I cleaned my carb. Pulled out all the jets cleaned them put them back in and set to factory specs. I have spark. I have fuel. I have compression but now it still wont start with starter and wont start with kick starter either. But after a few kicks there is a loud backfire. What am I missing?