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Cam Inspection
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<blockquote data-quote="kirrbby" data-source="post: 152170" data-attributes="member: 3972"><p>I've seen some dirty oil before, and yours is NOT. At least not as far as 40+ year old minibikes go.</p><p></p><p>Everything I see in there looks good, and I know your stator looks pristine. </p><p>The rubber gear with steel teeth is the oil pump drive gear. That's the one that will usually show wear. Yours looks good from what I can see.</p><p>Right now is the perfect time to pull the cam chain tensioner out and see how it works. You can't hurt anything too much without REALLY being careless. Take the plug out with washer. Loosen the jamb nut a few turns then loosen the locking stud a few turns. Then use a flat screwdriver to get up into the hole and back out the adjuster...plug. Take it right out. There will be a spring that comes out right behind it. Then the adjuster...rod, will come out if you help it. There is another spring inside of it. The 2 springs are different lengths, so pay attention to which where. That's all there is to it. Clean and replace, but mess around with it as you put it back. The rod will slide up and down with resistance from the spring the adjuster plug puts more or less tension on the chain. When the chain is (not too) tight, you lock it is place with the locking stud and snug the jamb nut to hold it there. The rod has a flat side for where the lock stud hits it.</p><p></p><p>Make sure to tighten/torque the flywheel nut well so it doesn't loosen up on you. Also make sure the drive chain isn't too loose. </p><p>The rubber cap on the tensioner rod is a good part to replace...as racerx says, 40 year old rubber...</p></blockquote><p></p>
[QUOTE="kirrbby, post: 152170, member: 3972"] I've seen some dirty oil before, and yours is NOT. At least not as far as 40+ year old minibikes go. Everything I see in there looks good, and I know your stator looks pristine. The rubber gear with steel teeth is the oil pump drive gear. That's the one that will usually show wear. Yours looks good from what I can see. Right now is the perfect time to pull the cam chain tensioner out and see how it works. You can't hurt anything too much without REALLY being careless. Take the plug out with washer. Loosen the jamb nut a few turns then loosen the locking stud a few turns. Then use a flat screwdriver to get up into the hole and back out the adjuster...plug. Take it right out. There will be a spring that comes out right behind it. Then the adjuster...rod, will come out if you help it. There is another spring inside of it. The 2 springs are different lengths, so pay attention to which where. That's all there is to it. Clean and replace, but mess around with it as you put it back. The rod will slide up and down with resistance from the spring the adjuster plug puts more or less tension on the chain. When the chain is (not too) tight, you lock it is place with the locking stud and snug the jamb nut to hold it there. The rod has a flat side for where the lock stud hits it. Make sure to tighten/torque the flywheel nut well so it doesn't loosen up on you. Also make sure the drive chain isn't too loose. The rubber cap on the tensioner rod is a good part to replace...as racerx says, 40 year old rubber... [/QUOTE]
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