活塞更换时间? 先生。 知道这一切

WR450F活塞更换?
亲爱的全知先生,
I am a slightly overweight, 50-plus-year-old slow guy who has enjoyed my 2005 Yamaha WR450F since purchasing it new in 2004. I religiously service the bike myself, including regular oil and air filter changes, valve checks (they have never needed adjustment—ever) and run 100-octane fuel.我是个略有超重的,2005岁以上的慢家伙,自25年购买新车以来,我一直喜欢我的XNUMX Yamaha WRXNUMXF。我虔诚地为自行车提供服务,包括定期更换机油和空气滤清器,检查气门(他们从未直到需要调整为止)并运行XNUMX辛烷值的燃料。 The motor runs strong, and does not smoke, use oil or make any odd sounds.电机运转强劲,并且不会冒烟,不加油或发出任何奇怪的声音。 People always seem surprised when I tell them it's a XNUMX. I do not have an hour meter, but I estimate the bike must have several hundred hours on it by now.当我告诉他们这是XNUMX年时,人们总是感到惊讶。我没有小时表,但我估计到现在这辆自行车必须有数百个小时。 My question is about piston replacement.我的问题是关于活塞的更换。 The factory service manual says XNUMX-hour interval for piston replacement.工厂服务手册说,每XNUMX个小时更换一次活塞。 I am sure this recommendation is geared more for racing use;我确信此建议更适合赛车使用; however, given the cumulative hours, should I be worried about piston/top-end failure?但是,鉴于累计小时数,我应该担心活塞/顶端故障吗?
帕金森
通过 [电子邮件保护]

WR的气门不需要任何调整,这说明您确实照顾好自行车并小心维护。 Excessive engine heat, bouncing off the rev limiter and sucking dirt (or water) through the air filter are all causes of valve problems.发动机过热,反弹限制器反弹以及通过空气滤清器吸入灰尘(或水)都是气门问题的原因。 Yamahas offer better valve life than a lot of brands;雅马哈提供的阀门寿命比许多品牌更长。 however, no matter how well you care for the engine, the piston is still going up and down, and that will cause ring and piston wear.但是,无论您对发动机的保养程度如何,活塞仍然会上下移动,这会导致活塞环和活塞磨损。 All modern, high-rpm four-strokes have pistons without a great deal of skirt length to stabilize the piston.所有现代的高转速四冲程活塞都没有很大的裙边长度来稳定活塞。 Again, the Yamaha WR450F is better than most, but a new piston and rings are still a good idea.同样,Yamaha WRXNUMXF比大多数产品都要好,但是新的活塞和环仍然是一个好主意。 It is unlikely that you will notice a performance improvement, but you want the piston to be stable in the bore, and you don't want it to break or pull sideways.您不太可能会注意到性能的提高,但是您希望活塞在孔中保持稳定,并且不希望活塞断裂或侧向拉动。 Check to make sure that the cylinder bore is straight as well.检查并确保气缸孔也笔直。 If you can no longer see cross-hatching in the cylinder wall where the rings contact the surface, have the bore checked.如果您再也看不到环接触表面的圆柱壁上的交叉影线,请检查孔。 The cylinder may need to be replaced or re-plated.气缸可能需要更换或重新电镀。 You should absolutely change the cam chain and the cam-chain slides.您应该绝对更换凸轮链和凸轮链滑轨。 Check the oil pump and pump gears, and replace any that are plastic.检查机油泵和泵齿轮,并更换任何塑料的。 Check the water-pump impeller for wear as well.还要检查水泵叶轮是否磨损。 Naturally, check for play in the connecting rod as well.当然,还要检查连杆中的间隙。

您可以同时完成阀门和阀头,但这是重建过程中最昂贵的部分。 让您信任的技术人员评估气门是否密封,挺杆的状态(覆盖气门弹簧的铲斗)和凸轮凸角的状态。 这应该使您能够决定是否单独放置阀门。

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