Author Topic: Need for new crankshaft with upgrade?  (Read 2791 times)

Kenho21

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Need for new crankshaft with upgrade?
« on: June 17, 2011, 10:18:12 PM »
I just spoke with a gentleman on the phone about installing my 80cc kit and he said that on any scooter that he puts anything larger than 60cc he installs a new crankshaft because the bearings in the stock one will eventually wear out and cause damage to my scoot.

Is this necessary?
« Last Edit: June 17, 2011, 11:43:38 PM by Kenho21 »
2009 Kymco Agility 50- 72cc Airsal kit, Uni Free-Flow Air Filter, Main Jet 120, 1500 Contra Spring, 6g Rollers, Malossi Multivar Variator, NCY Exhaust, NCY 80cc Camshaft, Cut CDI, Smooth Boss Drive, MRP Ignition Coil

blue

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Re: Need for new crankshaft with upgrade?
« Reply #1 on: June 18, 2011, 03:05:23 AM »
true I have seen so many scoots brke down after a 70 kit so im sure its the same for a 80. If it was me I would of just got a bigger scoot all long. if you want a 50 buy a 50 if ya want a 80 buy a 80 so on and so on.

Kenho21

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Re: Need for new crankshaft with upgrade?
« Reply #2 on: June 18, 2011, 03:36:44 AM »
That might have been the better idea, I never meant to even get a scoot kinda fell into it and now that I have one I've created a monster and have kinda gone too far to turn back now...
2009 Kymco Agility 50- 72cc Airsal kit, Uni Free-Flow Air Filter, Main Jet 120, 1500 Contra Spring, 6g Rollers, Malossi Multivar Variator, NCY Exhaust, NCY 80cc Camshaft, Cut CDI, Smooth Boss Drive, MRP Ignition Coil

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Re: Need for new crankshaft with upgrade?
« Reply #3 on: June 18, 2011, 11:06:59 AM »
Its the boy in us all we have to play and try to get that speed.

thebatman

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Re: Need for new crankshaft with upgrade?
« Reply #4 on: June 18, 2011, 11:40:32 AM »
I just spoke with a gentleman on the phone about installing my 80cc kit and he said that on any scooter that he puts anything larger than 60cc he installs a new crankshaft because the bearings in the stock one will eventually wear out and cause damage to my scoot.

Is this necessary?


IMHO, NO.....There are LOTS of ppl that use the stock crank.. Kymco makes a good,strong crank, besides this guy said something about the bearings going out in the crank???.....oooook, change that bearing/con rod, not the whole crank...lol   Personally i think he's jus trying to get more money from you...
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Re: Need for new crankshaft with upgrade?
« Reply #5 on: June 18, 2011, 09:28:48 PM »
when ever you take your scoot in for repairs tell theam to save the old parts so you can see what they realy looked like. so you know you were not riped off.

Kenho21

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Re: Need for new crankshaft with upgrade?
« Reply #6 on: June 18, 2011, 10:11:43 PM »
I was thinking of just changing the rod/bearings but they are factory sealed and from what I understand practically impossible to just swap out. But I have never even dug that far into the engine so I'm kinda nervous to do it on my own.
2009 Kymco Agility 50- 72cc Airsal kit, Uni Free-Flow Air Filter, Main Jet 120, 1500 Contra Spring, 6g Rollers, Malossi Multivar Variator, NCY Exhaust, NCY 80cc Camshaft, Cut CDI, Smooth Boss Drive, MRP Ignition Coil

sidthesloth

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Re: Need for new crankshaft with upgrade?
« Reply #7 on: June 18, 2011, 11:59:07 PM »
I don't have any experience changing conrod bearings on these crankshafts so I personally would give that job to someone with experience and the correct tools. If there are no problems with your existing crank, I would just reuse it, until you want to replace it.
ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

thebatman

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Re: Need for new crankshaft with upgrade?
« Reply #8 on: June 19, 2011, 01:21:10 AM »
Jus keep your crank, save that money for another mod  ;)
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Kenho21

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Re: Need for new crankshaft with upgrade?
« Reply #9 on: June 19, 2011, 04:58:37 AM »
Yea, I think that's gonna be the plan keep the current crank and count on good ol' Kymco quality. Can't wait for the 80cc kit order to be placed and installed soon as I get the money and the time (hopefully next two weeks). Next up performance variator, clutch assembly and kevlar belt!
2009 Kymco Agility 50- 72cc Airsal kit, Uni Free-Flow Air Filter, Main Jet 120, 1500 Contra Spring, 6g Rollers, Malossi Multivar Variator, NCY Exhaust, NCY 80cc Camshaft, Cut CDI, Smooth Boss Drive, MRP Ignition Coil

streido

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Re: Need for new crankshaft with upgrade?
« Reply #10 on: June 19, 2011, 08:45:44 PM »
There was a discussion an Kevlar belts i read the other day saying theyre not as good as rubber. Worth reading that before you commit to Kevlar.
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Kenho21

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Re: Need for new crankshaft with upgrade?
« Reply #11 on: June 19, 2011, 09:43:19 PM »
I will definitely look for the discussion before I hand over any cash for especially since they aren't typically cheap. I assume they have the tendency to slip a bit more than necessary...
2009 Kymco Agility 50- 72cc Airsal kit, Uni Free-Flow Air Filter, Main Jet 120, 1500 Contra Spring, 6g Rollers, Malossi Multivar Variator, NCY Exhaust, NCY 80cc Camshaft, Cut CDI, Smooth Boss Drive, MRP Ignition Coil

streido

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Re: Need for new crankshaft with upgrade?
« Reply #12 on: June 19, 2011, 10:19:35 PM »
It was more to do with them not lasting as long and how some had just snapped and ripped up thro wear. You cant tell as easy when its due to go on kevlar but you can see when your rubber belt begins to get worn and swap it long before any snappage. Think that was the general feeling on the thread anyway.
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sidthesloth

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Re: Need for new crankshaft with upgrade?
« Reply #13 on: June 19, 2011, 11:17:28 PM »
My understanding of the kevlar belts is that the fibres inside the belt are kevlar. It is this that makes a mess when it breaks.
ZX50, 47mm cyl. kit, TZR50 CDI. Michelin Pilot Sport tyres,
Next performance mod; pumping the tyres up.

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