It may be because you keep your foot on the accelerator at the same time.
Because that's how an engine runs. it can only ever rev up if you give it gas. no gas, no revs. more gas, more revs
Every time you engage the clutch, the clutch disengages from the transmission/engine. Which in term engine revs up, until you disengage the clutch.
So you can't max it out and blow up the engine.
Try servicing the air filter.
To increase the speed of the engine, which is measured in 'revolutions per minute' - shortened to RPM or 'revs'.
When the engine revs higher than normal when you accelarate sharply, when the engine revs higher than normal backing up a slope, are the first signs.
add coolant.
Could possibly be a messed up vacuum hose. Not sure where it is located.
Because your foot is on the gas and something is wrong with your engine.
because the engine turnes at diffrent speeds ie. tick-over is about 1.5k revs where as speeding down the road is at 5k revs the faster the engine turns the more the pressure builds up
low speed in carb stopped up....carb needs cleaningAnother AnswerMost common cause of engine revving up and down is a dirty or clogged air filter.
Gear changes are determined after how fast the engine is turning. For each gear there are set limits for which engine revs that are allowed. if the revs go high, the transmission changes up a gear, if the gears go low it drops down a gear.