Engine Trouble Broken Crank where mag bolts onto

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Be aware that there are two styles of crankshafts, depending on the stroke of your engine. One has a 40mm stroke crankshaft and the other has a 38mm stroke crankshaft. GT-5A, GT-5SR or PK-80 motors which have 40mm stroke crankshafts. Engines currently available from Gasbike, Kings and Piston Bikes are GT-5 type and have a 38mm stroke crankshaft. This information is from CR Machine: http://www.shop.crmachine.com/Stage-2-GT-5-Skyhawk-Cylinder-Body-66cc-BCBS2.htm

Chris
AKA: BigBlue
 
I never saw a washer in there or I didn't notice it. I think thats just part of the stack of plates?
When I pulled it apart from the coil it just had a lot of metal flakes on it.
Looks like a new engine is going to cost about the same as getting all the parts to fix this when shipping charges are figured in assuming that one of the $95 sellers on ebay will ship it to me in good ol california.
Maybe I should do that and keep this one for parts. I know everything but the crank and magnet are good on it having only ran less then 3 tanks of fuel. It was just starting to make good power, I never kept the rpm's high, allways shifted it low in the powerband, basically I just putted around on it.
The seller was enginesonlineshop.com He states right on his site 30 days warranty well its been about 45 days because it took me awhile to install it waiting for the shift kit then doing the actual install wich was my 1st motor bike build. He did include the tool to remove gears but It stripped out the 1st time I tried to use it, it was all crooked where the tool screws in to. Basically garbage. I figure I can pick up a gear puller cheap at harbor freight when I need it.
I really miss riding that thing, When I can afford it I think Ill build a 2nd bike for a backup. Would be nice to have one in running condition at all times.
 
Be aware that there are two styles of crankshafts, depending on the stroke of your engine. One has a 40mm stroke crankshaft and the other has a 38mm stroke crankshaft. GT-5A, GT-5SR or PK-80 motors which have 40mm stroke crankshafts. Engines currently available from Gasbike, Kings and Piston Bikes are GT-5 type and have a 38mm stroke crankshaft. This information is from CR Machine: http://www.shop.crmachine.com/Stage-2-GT-5-Skyhawk-Cylinder-Body-66cc-BCBS2.htm

Chris
AKA: BigBlue

I have no idea what mine is, I asked the seller and all he knows is they come over in a container from china. He claims to manufacture them himself on his web page but thats BS or he would know the specs!
 
Here is my communication with the vendor. If you look at his website it clearly states they manufacture and import there own engines. This goes against what he told me in the email!
So Basically I am not going to purchase another motor from him, he isn't even offering to sale me another kit for a discount, I think that would be the "right" thing to do, at least sale me one at his cost. I understand the 30 day warranty and all but the pictures clearly show this catastrophic failure wasn't my fault.


replacement engine?
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Dan S
Sep 1 (3 days ago)

to enginesonlines.
Hi, I purchased a engine kit from you on july 13. I ordered a shift kit and didn't get everything installed until 3 weeks ago.
Engine ran fine up until 3 days ago when it just quit on me while riding. After getting it home and pulling the mag cover I discovered that the crankshaft has broke where the mag rotor bolts onto.
This happened after only 1 1/4 gallons ran through it. I am sending you pictures , the 1st 2 pictures are right as I removed the cover. I will call you on monday to see what we can work out with this.

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enginesonlineshop .
Sep 2 (2 days ago)

to me
Our return and exchange policy is 30 days from the day it arrives. Because the engine doesn't have a odometer on it to show how many miles actually was put on it. Time is the only thing we can go by.


Dan S Sep 2 (2 days ago)
so how much will you sale me an engine only for?

enginesonlineshop .
1:43 PM (11 hours ago)

to me
Sorry but we don't have just the engine for sale at this time.


Dan S <danrschaffer@gmail.com>
8:26 PM (4 hours ago)

to enginesonlines.
Where would I purchase a crankshaft from? Are they all the same with the 66cc/80cc ?


enginesonlineshop .
10:57 PM (2 hours ago)

to me
66 and 80 is the same. But we don't know where to purchase one of those too. Our company is strictly a distribution center. Our role is like costco. We don't manufacture anything here. We import it in containers and then distribute to the public. That is why we offer only 30 days on all our items. We don't fix or sell replacements for these engines.
 
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false and or misleading advertising. get legal on the suckers backside! thatll teach em to be... i cant say it here :(

i cant see that small 1mm thick washer having been enough to destroy that magnet that way. plus it would be in a different spot what with rotation.

somethings obviously really been in there and had a go. possibly the key for the magnet, having been assembled incorrectly, they just stick to the back of the magnet... i can see the things not only been split apart, but sort of twisted like a potato crisp as well.

hit one with a sledgehammer and see how much damage you can do ;) pretty tough, them magnets are.

if anything, id say it was the crank itself, had a flaw in the steel that passed all highly stringent qc tests :giggle: maybe even dropped and they tried straightening it at one point! just bad luck. bit of imbalance combined with a stressed area...wacka wacka wock!

if it had snapped right at the shoulder on the crank, id say the fillet was too sharp. it didnt :(

man. ive had $30 refund on a $130 kit because i had a dented tank! tiny lil dent and i sorta felt bad but it wasnt for me so i had to :(

easier and cheaper to just buy a new motor and sigh a lil bit
 
If it were me, I'd buy another engine, then you can be riding while rebuilding the other one. It'll be good experience, even therapeutic. Yes, some of these so-called vendors need to be banished to the gates of hell, watch out for high shipping costs, that's a dead giveaway. The California laws don't apply to the engine, it's considered "parts only" as it can't be operated without other parts in the full kit. Good luck and don't let this experience sour you on the hobby.
 
My wife thinks I broke it doing stupid stuff like I used to do in my car, burnouts, drifting, ect. but I try to explain to her where the crank broke has nothing to do with over-revving, abusing it , ect... This seems like a low stress area of the crank, I think I could just about epoxy it back together but I have no way of knowing where the magnet key should mount on it (engine spark timing would be way off).
 
My wife thinks I broke it doing stupid stuff like I used to do in my car, burnouts, drifting, ect.

That kind of thing isn't considered "stupid", it's called "fun"



seems like a low stress area of the crank, I think I could just about epoxy it back together

that could be considered to be a stupid idea.
 
So fabian do you agree that crank broke where it broke could not have been caused from over revving the little motor? Would like to have at least 1 semi expert opinion to show her so she cant mention this as another one of my "failures"....,...............

I also agree on the "fun" part of burnouts and drifting, unfortunately my wallet disagrees. I still have the perfect truck sitting in my driveway to do it though, a 2000 dodge dakota R/T with 97,000 miles that hasn't been driven out of my neighborhood in almost 2 years. Haven't paid the license on it, its on non op.
 
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