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PostPosted: Sun Jul 30, 2017 11:07 pm 
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Rim Kicker
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
I bought this Derbi Gp1 that had a blown engine, I drove up to Seattle to pick it up. I've always wanted one but they rarely come up for sale, but it's kind of a gamble since it needs work. It's the first non Honda scooter I've owned and my first water cooled engine also. The previous owner claimed it did 55mph with a 70cc BBK before it popped. I've all ready got a new top end on order, hope that's all I need to get it running.
ImageDSC06914JPG by Tyler V
ImageDSC06975JPG by Tyler V


Last edited by tyler vr on Mon Aug 07, 2017 1:24 am, edited 1 time in total.

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PostPosted: Sun Jul 30, 2017 11:10 pm 
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Rim Kicker
Rim Kicker

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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
I noticed some shards of metal in the case from the blown top end. I decided to flush it with brake cleaner and premix then suck it out, repeated that a dozen times.

ImageDSC06958JPG by Tyler V, on Flickr
ImageDSC06960JPG by Tyler V, on Flickr
ImageDSC06982JPG by Tyler V, on Flickr


Last edited by tyler vr on Mon Aug 07, 2017 1:26 am, edited 1 time in total.

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PostPosted: Sun Jul 30, 2017 11:14 pm 
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Rim Kicker
Rim Kicker

Joined: Fri Nov 27, 2015 5:34 pm
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
The exact reason why it blew is unknown, looking at the old piston I'm guessing it was running lean and got too hot. This derbi also has a aftermarket exhaust pipe and little bigger carb. I'm thinking the previous owner took off the stock airbox and installed a high flow filter without re jetting. I'm avoiding splitting the cases, if I had to this project would probably go on the back burner until winter.

ImageDSC06947JPG by Tyler V, on Flickr


Last edited by tyler vr on Mon Aug 07, 2017 1:27 am, edited 1 time in total.

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PostPosted: Mon Jul 31, 2017 4:22 pm 
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Throttle Master
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Joined: Tue Aug 28, 2012 5:01 pm
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Location: Mississauga Ontario
That piston looks like utter crap. Wow
That thing should easily hit 60MPH in 70cc form. 55MPH in 50cc form should be a given. My wife's '03 Vino will hit 88kph and it's still a 50cc 2stroke.
Good luck on the rebuild.

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PostPosted: Wed Aug 02, 2017 8:06 pm 
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Throttle Master
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Location: Oakville, Ontario
Need a favor. can you take a close up pic of the coil/cdi unit. need to figure out what plugs in to it.

Thanks

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PostPosted: Fri Aug 04, 2017 3:31 pm 
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Rim Kicker
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
GVH wrote:
Need a favor. can you take a close up pic of the coil/cdi unit. need to figure out what plugs in to it.

Thanks


I don't think you can see much of the wiring right now. I looked at the last pic you posted on your thread and your wiring might be a bit different from mine.

Have you found the PDF predator manual online yet? I can send it to you it through email.


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PostPosted: Fri Aug 04, 2017 5:55 pm 
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Throttle Master
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Location: Oakville, Ontario
tyler vr wrote:
GVH wrote:
Need a favor. can you take a close up pic of the coil/cdi unit. need to figure out what plugs in to it.

Thanks


I don't think you can see much of the wiring right now. I looked at the last pic you posted on your thread and your wiring might be a bit different from mine.

Have you found the PDF predator manual online yet? I can send it to you it through email.


Found a general pdf of all Derbi Piaggio units

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PostPosted: Mon Aug 07, 2017 1:30 am 
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Rim Kicker
Rim Kicker

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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Got the new top end kit, it's a cheap one off ebay. I think the old top end is a brand called airsal, it's a aluminum jug and the new one is cast iron.

ImageDSC06946JPG by Tyler V, on Flickr
ImageDSC06948JPG by Tyler V, on Flickr
ImageDSC06950JPG by Tyler V, on Flickr


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PostPosted: Mon Aug 07, 2017 1:30 am 
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Rim Kicker
Rim Kicker

Joined: Fri Nov 27, 2015 5:34 pm
Posts: 30
To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
I went to install the new top and was torquing the head bolts when a head stud snapped. I was lucky enough to get a easy out to bite and got the remaining threads extracted from the engine block. I'm going to try again tomorrow with just some m6 all thread.

ImageDSC06964JPG by Tyler V, on Flickr


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PostPosted: Tue Aug 08, 2017 2:52 pm 
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Rim Kicker
Rim Kicker

Joined: Fri Nov 27, 2015 5:34 pm
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
It runs, just doing some heat cycles to break it in.

ImageDSC06972 by Tyler V, on Flickr


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PostPosted: Tue Aug 08, 2017 2:54 pm 
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Rim Kicker
Rim Kicker

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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
I keep blowing fuses just seconds after the ignition is turned on. The engine still runs, but I haven't rode it yet, so I've just been heat cycling it. I figured out the problem was the voltage rectifier/regulator; blew a lot of fuses trying to figure it out.

ImageDSC06989JPG by Tyler V, on Flickr


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PostPosted: Thu Aug 10, 2017 4:06 pm 
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Rim Kicker
Rim Kicker

Joined: Fri Nov 27, 2015 5:34 pm
Posts: 30
To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Got it together, rides pretty good.

ImageDSC07002 by Tyler V, on Flickr
ImageDSC07005 by Tyler V, on Flickr


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PostPosted: Sat Aug 12, 2017 12:09 pm 
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Throttle Master
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To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Location: Oakville, Ontario
Sweet. Nice work on fixing it. Now could you fix mine please.

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PostPosted: Sun Aug 20, 2017 10:08 pm 
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Rim Kicker
Rim Kicker

Joined: Fri Nov 27, 2015 5:34 pm
Posts: 30
To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Well the ebay kit popped a head gasket, just under 100 miles. I was heading to work when it overheated, it was running when I turned it off but wouldn't restart. When loading it up in a truck I saw coolant dripping from the exhaust pipe.

I all ready pulled the head off, the head gasket o ring just doesn't fit in the groove good enough. I could probably get it running again if I get the correct thickness o ring to fit in the groove. But my plan is just to buy a malossi 70cc top end kit.


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PostPosted: Thu Aug 31, 2017 2:24 pm 
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Rim Kicker
Rim Kicker

Joined: Fri Nov 27, 2015 5:34 pm
Posts: 30
To prevent spam, enter the year 'modern' scooters were first sold in North America (hint: 1982): 1982
Got the malossi top end kit, its a lot higher quality than the ebay kit.

ImageDSC07023 by Tyler V, on Flickr


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