B1 rep problems - new guy, need help. - Pocket Bike Forum - Mini Bikes
 
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post #1 of 8 (permalink) Old 04-25-2017 Thread Starter
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B1 rep problems - new guy, need help.

Hi, all !
I want to buy a b1 replica with the AL aoli engine in it. The guy who sells it said, few days ago the engine ran for a small time (25-30 secs), then stalled. After a stall, he needed to wait some time for next start. When i arrived to him, the bike started no way. It has good spark, spark plug becomes wet, we cleaned the carb+fuel lines, the engine had compression, so we dont know what happened. Should i buy it and try to repair - (possibly the bike has some minor problem), or the bike is possibly crap and needs expensive rebuild ? Thanks for the tips, guys !
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post #2 of 8 (permalink) Old 04-25-2017
Re: B1 rep problems - new guy, need help.

Is it air or water cooled// I have both types of B1 / C1s. Before you buy a W/C, take the 3 bolt starter rope housing off the right side of the engine, and see if the O ring drive belt is on the flywheel and pump pulley. Check the water pump pulley to make sure it turns free and not locked up. If its not turning the engine is probably bad or going bad. I would not pay more than $100 for a bike you cannot ride. I had my water pump freeze and you can not tell without removing the rope starter and to make it worse you have to pull the engine and split the cases to fix the water pump. For around $150 you can get a new cyld, head & piston with ring, plus water pump parts if needed. I would not buy a water cooled B1/C1, the pumps go out without warning and by the time you find out the engine has seized. I love my air cooled 39cc C1, mine is in a water cooled frame. Ask Kray15, he bought a W/C C1 and change over to the air cooled Cyld and head. The cases work for both engines, the A/C you leave out the water pump. Do Not buy a water cooled B1, there nothing but trouble!!!
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File Type: jpg 40cc Air Cooled C1 Blata Clone1.jpg (455.8 KB, 4 views)
File Type: jpg 40cc Air Cooled C1 Blata Clone2.jpg (477.4 KB, 5 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
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post #3 of 8 (permalink) Old 04-25-2017 Thread Starter
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Re: B1 rep problems - new guy, need help.

Whoops, i forgot it.. Yes, it's a water-cooled one. It seems they are really problematic, so i need to forget it. Thanks for help !
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post #4 of 8 (permalink) Old 04-25-2017
Re: B1 rep problems - new guy, need help.

So, how much is he asking for it?? Do you live in Europe?? I would tell the guy to take that cover off, you will know right away if there is a problem. The pump shaft seal fails alot and it lets water into the ball bearings and they rust and seize and you engine over heats before you know what happens. I just finished my 50cc ( 46cc ) W/C C1 in the photos. I rebuilt the whole engine and water pump, used a red Dupont Viton shaft seal and SKF Nascar bearings, SKFs on my crankshaft also, lol. Haven't started it up yet, a few more weeks and it will be Nice weather.
I would look for a Polini or Polini china bike. I am building a Euro BZM 39cc water cooled engine to put in my avatar photo GRC GP all alum frame racing bike w/ a silver stuffed crank and 690 BZM racing cases. It has a China 40cc Polini clone engine w/ a Polini clutch housing and BZM racing clutch. The water pump is driven off a pulley behind the front pinion gear, so you can see if the belt is still on and if it is turning anytime.
My China Banshee Sho 50cc Polini clone engine I put an ADA Racing billet alum 15:1 racing head, and it Halls Azz. I am a Polini / BZM engine man now, lol.
Attached Images
File Type: jpg GRC Finihed on the Work Bench1.jpg (384.1 KB, 5 views)
File Type: jpg GRC Finihed on the Work Bench2.jpg (443.7 KB, 3 views)
File Type: jpg GRC Finihed on the Work Bench4.jpg (159.5 KB, 4 views)
File Type: jpg 50cc Banshee Sho Finished1.jpg (166.4 KB, 4 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
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post #5 of 8 (permalink) Old 04-26-2017 Thread Starter
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Re: B1 rep problems - new guy, need help.

Yes, i'm european, living in hungary. He wants 35000 huf, which is around 115-120 in dollars. Few weeks ago, i bought a cag for ~45$ but i found it is a piece of junk.. :S Found this rep in a craigslist-like website near my city and it seems a bit better one than a cag, thats why i thinked about it. I suspect some serious problems, because i found a sealant "patch" on the underside of the crankcase where the water pump shaft runs (and the crankcase halves joining), and it was a little bit wet.. I fear if the frame and suspension ok (as they seems), the engine is possibly crap. Now i dunno what to do.. Buy this and try to fix/modificate it or leave it and buy a rideable chinese cag for this money ?

And really thanks for help !
(and sorry for my "do-it-yourself" english use)
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post #6 of 8 (permalink) Old 04-26-2017
Re: B1 rep problems - new guy, need help.

Wow, a patch on the bottom of the engine, The cases have to be air & water tight, if it was leaking on the bottom I would not buy it, cases are probably cracked or warped, and leaking water. My C1 new was $450 USD. New cases are around $40, and then SKF bearings and crank seals, and $40 plus to rebuild the water pump. Your main problem is where do you get parts?? If the cases were good you could go to an air cooled cyld and head, and leave the water pump area blank. They don't make parts anymore, hard to find even here in California USA. Pocket Bike Parts in Florida USA has parts, but cost alot to send them to you. I have 13 bikes and 5 project bikes going right now, lol.
It's cheap to rebuild a Cag. For $80 you can get a big bore kit with 15:1 winged billet alum head & cap and hp ported cyld w/ piston, rings, pin, clips and rod bearing and full gasket kit and full circle racing crankshaft, even a China spark plug. All you need is maybe new crank bearings and case seals, and you have a brand new engine.
My advice for you is get a PayPal account and buy direct from China, most free shipping world wide. Search eBay for parts, and I also deal with AliExpress.com and Banggood.com for some parts, direct from China. Search, 47cc, 49cc Pocket Bike Parts and Engines on eBay and see what shows up. Here is my custom build Lucky 7 Cag with Winged head engine.
Attached Images
File Type: jpg Lucky 7 Side Pipe Exhaust1.jpg (356.7 KB, 3 views)
File Type: jpg Lucky 7 Side Pipe Exhaust2.jpg (405.2 KB, 3 views)
File Type: jpg Lucky 7 Side Pipe Exhaust3.jpg (359.5 KB, 4 views)
File Type: jpg Lucky 7 Side Pipe Exhaust4.jpg (313.8 KB, 3 views)
File Type: jpg Lucky 7 Side Pipe Exhaust5.jpg (385.9 KB, 3 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
EPR is offline  
post #7 of 8 (permalink) Old 04-26-2017 Thread Starter
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Re: B1 rep problems - new guy, need help.

Ok, i should stay with a cag. Just one more question: mta2-s are ok ? Because this is the only type which can be found (mostly) around here. Thanks !
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post #8 of 8 (permalink) Old 04-26-2017
Re: B1 rep problems - new guy, need help.

Yeah, there cheap, alot of high performance parts available. Easy to get parts direct from China. I have an A1, A2, & Lucky 7. A1 was my first pocket bike. See photos.
PS: Try to find a bike with good body and stuff that does not run, for $30 or $40 USD and buy an $80 to $90 B/B 49cc winged billet head & cyld kit w/ full circle crankshaft, and rebuild the whole engine w/ 5 plus horsepower. That's $120 to $130 for the whole bike w/ a hot rod engine. An hp exhaust helps also. I always change the tin reeds on the reed plate to carbon fiber for $10 or less and you can add a 15 or 16mm pumper carb and alum adaptor manifold, or you can modify your own carb., flywheel and clutch unit.
Attached Images
File Type: jpg The PB Great Pumkin Race1.jpg (357.8 KB, 5 views)
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File Type: jpg 100_0032.JPG (402.9 KB, 5 views)
File Type: jpg Lucky 7 Extended Frame1.jpg (499.5 KB, 5 views)
File Type: jpg 100_0022.jpg (151.5 KB, 5 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....

Last edited by EPR; 04-27-2017 at 01:57 PM.
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