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A very common problem since mowers were made noise compliant, to collect grass you need draught, this is produced by putting a large wing on the ends of the blades and having a high engine speed, unfortunatly large wings and high engine speeds mean high noise, so today the wings are very small and the engine revs low, this leads to low draught and grass blockage, you need to keep the under side of the deck clean and free from old grass clippings, make sure the machine is fitted with collection blades, not mulch blades, i cannot tell you to increase the engine revs, however if for some unknow reason the engine were to start reving higher it would help.
you need to check the pressure of the system if the system is a little low on freon it will cycle more also if the cooling fan is not working the pressure will raise and also shut off
sounds like the rev limiter is kicking in to keep the engine from over rev damage, there should be a way to get the limiter disabled or perhaps get the turbo building boost sooner.
Motorcycles and cars are designed so you can't over rev the engines in high gear. Air resistance will keep your speed low enough so the engine can't over rev. However, in a lower gear, you CAN over rev. If you don't have a tachometer on the bike, read your owners manual for suggested top speed in each gear. Or do a Google search for your bike and and "speed" and "gear".
No this is normal. As an engine wears then oil preasure will be less this is not due to a weak oil pump but wear in crank shaft bearing's. When an engine is new and bearings are tight then oil preasure wont fall a lot from reved up to idle as the engine wear's oil escapes quicker from the crank shaft bearings. Reved up oil preasure increases idle it drops off. If the oil light stays out then their is enough preasure to lubricate the engine. In fact in an older engine high oil preasure is a worse complaint as this means the oil system is clogging. All is ok with your pump. If the oil preasure is moving up and down at constant rev.'s then the oil pump is faulty. Hope this put's your mind to rest.
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