loosegrit
Scoot Enthusiast
Too much work. Hope for another scooter run Oct 2015.
Posts: 142
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Post by loosegrit on Jul 18, 2011 23:49:47 GMT -5
Any thoughts? I just had a 49cc to 80cc kit installed by my mechanic. The GY6 engine is now producing so much heat that I broke 2 no name Kevlar belts in less than 150 miles. I switch to a Gates Premium Belt and instead of breaking it expanded in about 10 minutes and started slipping. So I have been starting my scoot, then removing the belt cover and it runs fine. I try drilling about 40, 1/2 holes in my belt cover to give better air flow. Did not work. Still removing cover after starting. What a pain.
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loosegrit
Scoot Enthusiast
Too much work. Hope for another scooter run Oct 2015.
Posts: 142
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Post by loosegrit on Jul 18, 2011 23:56:12 GMT -5
Ps. I am not a hotrod type of rider rarely get over 25-30 mph and 6000 rpm.
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Post by nitroman666 on Jul 19, 2011 0:14:07 GMT -5
It's a stretch, but is the air flow shroud on the engine? Possible it was left off?
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Post by 90GTVert on Jul 19, 2011 12:49:22 GMT -5
Definitely check that. Did they install a head for an 80cc? If not, it's high compression now and that causes a lot of heat. I had a local shop that does tons of 80+cc kits tell me that they had lots of engine failures unitl they started installing a larger head along with the 80+cc kits.
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loosegrit
Scoot Enthusiast
Too much work. Hope for another scooter run Oct 2015.
Posts: 142
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Post by loosegrit on Jul 19, 2011 19:45:54 GMT -5
He showed me the old cylinder and head. This might scare you but this how I have solved the air flow problem.  |
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Post by Goosey on Jul 19, 2011 21:02:36 GMT -5
Ouch, that is not pretty, but effective?
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Post by stepthrutuner on Jul 19, 2011 21:50:19 GMT -5
Not too long ago one of the members here did a similar mod and his engine case fractured. I hate to tell you this but the cover is a load bearing component. Might not happen to you but then again....
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Jul 19, 2011 21:51:27 GMT -5
your not the first one to do that - it gets the job done though huh?
tough luck man!
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Post by stepthrutuner on Jul 19, 2011 21:59:59 GMT -5
Are you absolutely sure engine heat caused your belt problems? The extra torque possibly could have caused the belt to slip. A heavier contra spring and heavier rollers should lessen slip. A 4t crankcase does run hotter than a 2t crankcase though.
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Bong
Scoot Enthusiast
Posts: 235
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Post by Bong on Jul 22, 2011 14:29:58 GMT -5
I was gonna suggest drilling holes in the cover. Or maybe 1 big hole exposing the clutch bell. Looks like ya already figured that out  I did not know it was load bearing, I thought the only potential problem was the kick start. With that much gone I would say just go without and lose the kick-start. But that little bit may save the engine case I think, Maybe  I like it!! That desert/ Mad Max look is cool. Plus you can see everything working.. Or not Stay cool brother!!! |
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loosegrit
Scoot Enthusiast
Too much work. Hope for another scooter run Oct 2015.
Posts: 142
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Post by loosegrit on Jul 24, 2011 21:43:05 GMT -5
Another heat Question. I wanted too take off the plastic heat sheild around the outside of the cylinder for a cooler engine. My dealer saids it runs cooler with the plastic over it but that makes on sence to me. Who's nuts?
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Jul 24, 2011 22:13:15 GMT -5
ok dude, look at it this way: You have a fan attached to the flywheel which is sucking air into the enclosed engine area (kept enclosed by that plastic shield). so it sucks air in from the outside bypassing the skin of your scooter to give it the coolest possible air from the engines location. Leave the shield on. people alot smarter then you or me designed it that way. if that was a good idea hundreds of people would be posting it all over forums... just from what ive seen of this site Brent would have atleast an article on how to and why you would do it. Leave it on |
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Post by 90GTVert on Jul 24, 2011 22:57:16 GMT -5
I believe the cooling fan and shroud are much more effective than removing all of that to leave the cylinder exposed. No numbers to back that up for sure yet. I did try leaving a shroud off of a 2T for a brief test and it overheated quickly. The only folks that seem to have good success with this are drag racers that only run for a short distance.
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loosegrit
Scoot Enthusiast
Too much work. Hope for another scooter run Oct 2015.
Posts: 142
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Post by loosegrit on Jul 25, 2011 18:05:20 GMT -5
That answers my question. I'm nuts ( but I think I already knew that ) , I will leave the shield on. Thank You
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Post by Fox on Jul 25, 2011 21:50:33 GMT -5
The shrouds are there to guide the incoming cooler air over the cylinder even when the scooter is at a standstill. At idle there is air flowing across the cylinder. Without them the cylinder will over heat and cause possible valve damage, piston damage and can even cause warping of the cylinder head. Needless to say these are all bad things.
Back when I went through a couple of belts back to back it was my clutch slipping making the belt super hot. that heat transferred to the variator and ruined a set of rollers. I replaced the clutch and variator and the problem went away.
PS: If you kick that kicker too hard and the case will crack.
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