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Post by harleyracer59 on Dec 12, 2018 15:34:37 GMT -5
so an update on my ab07 and an issue on my motorized bike. I ended up buying a polini bbk for a honda lead 50 from parts for scooters on black friday. ports are way too big. I was planning on jb welding up the case surface and port matching with a Dremel. problem I have is:
I used jb weld to stuff my cases and crankshaft for my 66cc pk80 moped motor. well, my walbro leaked a half tank down its throat and I didn't notice this till the gas had gotten high enough to leak out the carb inlet. so I drained the gas, but motor was froze. after deeper inspection, the ethanol/ gasoline mix here in California swelled the jb weld to the point of case and crank interference. ive let it sit a week to hopefully dry out and shrink back down. not happening.
today im gonna split the cases and take pics. ill post them here for all to see. before I have an issue with this ab07, is there any better option than jb weld? it was fine for a couple tanks no issue what so ever. but if jb weld sits in this BS gas mix theyre feeding us here in cali, it swells.
thoughts, ideas, options anyone, id love to hear them thanks also where to buy the epoxies. ive found quick steel aluminum putty. I don't like the quick part though lol. doesn't sound too perminant
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Post by 90GTVert on Dec 12, 2018 15:58:39 GMT -5
Devcon Aluminum Putty is the most popular alternative that I can think of. I'm not sure exactly which product, but Belzona was mentioned to me at one point by pitobread. I believe 190mech has talked about another one, but I can't recall the name.
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Post by harleyracer59 on Dec 12, 2018 17:07:35 GMT -5
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Post by pitobread on Dec 12, 2018 17:49:55 GMT -5
Really you should avoid ethanol. Usually premium fuel has less or none. At least here in Canada. None of the old o rings, seals or possibly the floats are very resistant on these old rides.
Devon aluminum is good but I have also used JB. Can't comment on ethanol compatibility but it's probably on the devcon website.
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Post by 190mech on Dec 12, 2018 18:00:28 GMT -5
ARRRGG!!That looks terrible!With the ethanol "rich" fuel we are forced to run,who knows what epoxy is resistant to it...I use MetalSet A4 on my stuff,but they only see avgas as I'm swimming in it every day..Ive seen Jeffco 9700 epoxy mentioned as ethanol resistant for fuel tanks,but its not a structural epoxy,just a sealer/bonder..
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Post by harleyracer59 on Dec 12, 2018 18:09:07 GMT -5
Really you should avoid ethanol. Usually premium fuel has less or none. At least here in Canada. None of the old o rings, seals or possibly the floats are very resistant on these old rides. Devon aluminum is good but I have also used JB. Can't comment on ethanol compatibility but it's probably on the devcon website. im with you pitobread. I only use 91 octane premium. I know what ethanol does to hoses and seals, ect. problem is here in commifornia we have no choice. they aren't even saying there is corn squeezins in it. I can tell by my hard as a rock brand new fuel hoses and all the other problems with rubber parts on my classic cars and Harleys and scooters. it really sucks. also jb weld website states ok with ethanol, yet it has something to do with gas and ethanol mixture. ive searched the interweb California isn't the only one doing this and im not the only one having an issue like this...
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Post by pitobread on Dec 12, 2018 18:12:26 GMT -5
The only other factor i can say is while jb is resistant to gas or perhaps even ethanol, if it isnt 100% cured when it first comes in contact that is entirely out the window.
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Post by harleyracer59 on Dec 12, 2018 18:19:37 GMT -5
I completely cleaned and degreased the case halves. let dry a day or 2 then used the jb weld and didn't put the motor together for a week. this is my first time stuffing cases so I was overly careful. ive used jb weld a bunch though. so I can say 100% sure that it was prepped correctly and cured correctly. im bummed cause the balanced crank and extra case compression made this motor quick. and it ran smoother than any 49-66-80cc bike motor ive ever seen or rode
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lupo76
Scoot Enthusiast
Posts: 157
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Post by lupo76 on Dec 13, 2018 4:58:45 GMT -5
The point is, you should not avoid ethanol but you should avoid JB weld or any other stuff like that IN an engine!?!?!?
Fancy that, huh?
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Post by pitobread on Dec 13, 2018 10:35:24 GMT -5
No. That's not even close to what we are saying.
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Post by harleyracer59 on Dec 13, 2018 13:45:29 GMT -5
The point is, you should not avoid ethanol but you should avoid JB weld or any other stuff like that IN an engine!?!?!? Fancy that, huh? what would you use to stuff your cases and crankshafts or modify your ports with? stove top stuffing? lol the point is jb weld was a suitable solution, now the ethanol degrades its hardness, I am now looking for a replacement and to inform / forewarn my fellow performance junkies before they have a similar or far worse incident. luckily my engine wasn't running when the jb weld soften up. stick around you can learn something
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Post by harleyracer59 on Dec 13, 2018 18:36:50 GMT -5
UPDATE: I think the issue was the amounts of A and B hardener. one case half came out clean with a Dremel and a pick. while the other side im still fighting to remove. I did both halves separately because there's no way I could have poured both sides before the jb weld dried. so I did them one after the other then the crank and ports. now what mixture worked on the stronger side? I don't know. I just eyeballed the amounts. they were both close mixes to me. but there's diffidently a difference in the 3 batches. I didn't do it on propose though... any thoughts or ideas what the deal is?
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Post by 190mech on Dec 13, 2018 19:09:43 GMT -5
Did you use JB kwik or the standard slow cure?I have not had much luck with kwik other than sealing an envelope...
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Post by 90GTVert on Dec 13, 2018 19:47:51 GMT -5
If you want even amounts easier, try the JB Weld in the dual syringe. I didn't even realize they made original JB that way till recently, but I used it to fix a really stubborn fill on a case and it held for me after an attempt or 2 with the separate tubes didn't work out.
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Post by pitobread on Dec 13, 2018 19:51:38 GMT -5
You want the best mix? Weigh your A/B.. its the reccomended way devcon says to use their product. However you would need to know the weight ratio for that.. possibly may be on the net.
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