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Post by 90GTVert on Aug 21, 2016 7:20:33 GMT -5
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Post by pinkscoot on Sept 3, 2016 22:22:33 GMT -5
After getting the TGB of of the lift I decided that it was time to get the Derbi pump seal replaced. I read on Provo Scooter Derbi forum that it was easy you went in from the variation and just pulled it from that side, a pair of vice grips no problem. I'm not sure what world the worked in but it was not possible. First the screws that held the retaining clip on stripped when I pointed my allen wrench at them:
I ended up drilling them out because no screw extractor I have will fit in there. Then I tried loosening the shaft from the impeller and it was a no go. I couldn't get a firm grip in either end. The solution will be to split the case. I have the electric pump from Malossi that will solve the pump problem. I figure I'll plug the hole the shaft is in and do away with the whole future problem. I have new bearings and seals on the way. I think I'll stay with the original crank, it doesn't have that much wear on it and I'm sure is of a decent quality. Of course when I get in its a different story then I'll replace it. So off to the back of the shop for you. I really like this scooter, its well built and is a big bike that is light. I am really anxious to get it on the road.
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Post by spaz12 on Sept 3, 2016 22:32:29 GMT -5
Whenever I come across a bolt or screw that wants to strip out, I'll put a drift on it and smack it a few times with a hammer to release the tension on it. It works more often than not.
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Post by pinkscoot on Sept 3, 2016 22:47:41 GMT -5
If I had realized how soft the were I would have but it didn't take much to strip them.
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Deleted
Deleted Member
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Post by Deleted on Sept 3, 2016 22:50:43 GMT -5
My dad always used a hammer to give the screwdriver a whack or two as he torqued on it.
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Post by pinkscoot on Sept 7, 2016 18:54:44 GMT -5
I was able to get back on the Derbi today. I pulled the engine and cracked the case. This scooter has a nice stock crank:
Of course all of this work was about the failure of a $2 seal. The impeller busted to pieces on my try to replace the seal from the outside. Warning to anyone with a LC Derbi Predator, you have to split the case to fix the pump. The seal must be installed from the impeller side. here is the impeller as I found it, it probably broke when I was trying to remove it from the other side:
My plan is to reinstall just the shaft bearings and seal to close off the passage way that you can see to the left of the crank. Since nothing will spin it should last. If it does leak I have a plug to block the passage and fill the weep hole with JB Weld or something. I'll then use the electric pump to cool the engine. Where in the system should the electric pump go and does it matter?
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Post by ryan_ott on Sept 7, 2016 19:51:52 GMT -5
I prefer to keep the pump cool for longitivity so after the radiator before the engine.
So the flow would be out of engine, into radiator, out of radiator, into pump, out of pump, in to engine.
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Post by pinkscoot on Sept 7, 2016 22:47:58 GMT -5
That makes sense and works for me because the PO cut the hose at a perfect place to mount it.
I used it to flush the engine.
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Post by pinkscoot on Sept 11, 2016 11:19:12 GMT -5
I was able to spend a little time cleaning parts and here is the cylinder. It's aluminum and still has its hone marks. This engine only has 900 kilometers on it and I suspect was ride easy:
It looks like someone did some porting on it, maybe that way from the factory as part of the replica package:
Here are some shots of the head and cylinder. Its nice that it has cooling fins even though its Liquid cooled:
Though I don't have a shot of it the piston showed no signs of scoring. This engine is still a baby. I hope to get it all back together today, I'll keep you posted.
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Post by pinkscoot on Sept 13, 2016 8:56:41 GMT -5
While I was baking the case and getting that ready I did some cleaning off the spray paint bomb: Before:
After:
Yes it is a Derbi, the CVT says so, looking pretty good. I just need to figure out how to get it off of the plastic. I got the engine back together and installed, there are definitely steps, I had to pull the cylinder back off to get the oil pump on. There were a few steps back to take one forward. the water pump was bigger then I thought and not in line so I had to get creative on the install, it ended up between the belly pan and the frame:
Its a tight fit. The engine started and runs fine. Th managed to get 800ml of water in the system. But the engine still runs hot. The thermostat is bad so I left it out. There isn't any place on the engine to burp it and I suspect the coolant isn't getting there. The pump is running but the radiator is cool and the gauge reads in the red. I checked the CHT and its about 210f at idle. There is no radiator cap only an outlet at the top, I pulled that until I had water so the radiator is full. I have one idea to pull the temperature sending unit because its at the bottom of the head but when I pulled the hose at the top I had water. Any help with this would be appreciated. It may be a few days before I can get to it.
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Post by pinkscoot on Sept 16, 2016 9:52:59 GMT -5
I found the problem in the cooling system, when I did the flush before the water was able to get around the engine and flush everything else. I still needed to replace the seal on the pump it was still bad. I started scratching my head and pulling hoses to find the blockage, I new it wasn't in the engine because I had that apart and cleaned it so I started with the hose after the engine and found the problem in the piece that comes out of the head:
I had this off and looked at it but the clog was after the bend so I couldn't see it. Lesson learned. Its amazing how old coolant can really solidify. The engine runs cool as a cucumber. I need to redo my fuel line I think that the convoluted routing is making it hard for the gas to flow
I want too have it turn 90deg when it comes out it will be a work in progress.Maybe I'll get enough time the next few days to get it on the road so I can see if the rumors are true.
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Post by pinkscoot on Sept 16, 2016 22:26:52 GMT -5
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Post by niz76 on Sept 16, 2016 22:36:43 GMT -5
I think it looks sweet. That article was less than enthusiastic about the design tho...
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Post by pinkscoot on Sept 17, 2016 0:03:58 GMT -5
I agree that they are sweet looking scooters. Maybe he was just way ahead of his time.
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Post by ThomasTPFL on Sept 17, 2016 9:15:22 GMT -5
Ok so took all the carb out cleaned it all air filter new fuel whent for a ride felt something wierd almsot like 1 of the rollers was stuck out maybe explaining some of the bogging between low and hi managed a strong 72 mph !!!! With a nice tail wind down hill and get back to a funny smell you don't get from lc extremely hot engine think my water pump gaskets blown water dripping from the bottom of the case 😠just when you think your on to a winner back to the drawing board it is 😓 You legit got 72mph out of it? Stock?!?! Damn I gotta fix the brakes on mine.
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