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Post by kelley1258 on Aug 27, 2018 23:36:28 GMT -6
Need some advice on a starting point for a(n) issue(s) that I am having and where I should start. I had to replace the starter on my bike, when I pulled off the cover I found a magnet had exploded and 2 others were busted. The issue I am experiencing is I can not get above 6k RPMS in any gear. I am aware that the flywheel is unbalanced and being down magnets the generator is not going to produce power as it should. I am guessing it is a dirty carb issue, however I wanted to double check to make sure that my generator not producing correct power or being off balance could cause these types of power loss issues? Thanks in advance!
There is a little bit of snap, crackle and pop on the throttle down...
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Post by eaglerider on Aug 28, 2018 4:32:54 GMT -6
Well, this is a situation where there could be more than one thing causing the problem. Aside from the damaged flywheel, which you know needs to be replaced, my old question....when was the valve adjustment checked/done? Valve adjustment getting tight will limit the RPMs, and keep the engine from running right. Now, the shattered magnets presents another possibility, magnet shavings in the crankcase, which can clog up the oil pickup. this is not an RPM problem, but needs to be checked. Oil starvation is not good for the engine and transmission and can cause serious damage. I would pull the bottom of the crankcase, and check things out. The flywheel is not only "out of balance", the voltage and amperage, as you said, are nowhere right to provide proper power, and can therefore, not supply enough spark, especially at higher RPM.....the flywheel must be replaced, and the stator checked for damage.
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Post by bikeman on Aug 28, 2018 18:26:27 GMT -6
what "" you have broken magnets not cleaned out all the debris from the engine changed the filter and oil ?? and still trying to get it to rev past 6k.
there is only going to be one outcome from that, " it's like pulling the pin from a grenade it's only time before it explodes" strip it down clean it out change the flywheel oil filter and oil at least do that before proceeding. or you will wreck the engine.
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Post by andyuk454ltdbiker on Oct 8, 2018 15:57:26 GMT -6
I had the exact same thing. I was travelling home one cold night and 400 miles to go. Rotor exploded on me and I had to right off the engine for a reconditioned one. I still have my old engine and have stripped it down, yes most of it could be saves but it is hours of work I just did not have.
My advice is simple, if you can get a replacement engine do so and change the rotor for the new type. Then strip the other engine down in your own time. Once fully cleaned and inspected see what damage has been done.
I spent $850 on rotor and engine, as I am a bit of a fan of my 30 year old bike.
Just a question about power...., When you hit 6k revs, are you losing power in all gears or just the last two low gear? If so, remove the air filters and see if you get power back. If you do replace the air filters as well.
Just so I am clear you did state that it was chocking, popping and lose of power. Main thing is air filter.
As for lose of electrical power, get a multi meter across your battery and see if your voltage goes above 13.8 volts at 3,000 RPM. If the voltage does not increase above 13.4 then flush the oil, clean out all magnetic pieces, replace rotor asap (do not continue to use old rotor) and always make sure your battery is fully charged before you go out, if you use the old rotor (be careful as it will continue to explode magnets.)
It sounds like doom and gloom but better safe than sorry.
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Post by bikeman on Oct 8, 2018 19:27:15 GMT -6
good advice. but you know what baffles me. if you like run a 30 year old bike. that is known to shed magnets. "by the way they don't explode the resin glue becomes brittle and cracks then the magnets fall off, if it happens while the engine is running the loose magnet gets mangled in the stator and throws bits around the case".
why does no one think to check the flywheel until it's too late. it's dead easy to do takes about 3mins and will save you both time and money.
it can be prevented by regular inspection take out the two cover plates on the flywheel case put socket on centre bolt turn engine by hand [ignition off of course] clockwise look through the top hole with a torch while turning engine. you will be able to see all the magnets in turn.
look for cracking and chipping of the resin glue or cracks between the magnet and flywheel rim. if you see any don't use the bike. take the cover off remove the loose magnets clean it all up and re glue back on using resin glue or JB weld sand it flat and even and your good to go for a while until the next check.
if the resin glue is fine you ok for now. my old flywheel has had all the magnets glued back one at a time over the last 10 years. check yours you know it makes sense.
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