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Post by harleyracer59 on Jul 18, 2018 14:33:39 GMT -5
so while surfing the old interweb I stumbled across this on buyeee. watched it for a few days then I had to pull the trigger. seller described it as an AF27 cylinder, but this looks like AB07 porting to me. AF27 is a dio way bigger transfer ports. for those that might not know, an AB07 engine was produced by honda from 80'-84'. here in the US we saw them only 2 years in the first generation NB50/ Aero50. had a 40mmX39.6mm bore and stroke. was variated and has better gearing than an AF05. better ports in my opinion, also. this new cylinder is a 49mm big bore with 7 ports. should be a screamer. just wanted to share with yall. im extremely happy I got this and cant wait for it to get here so I can install it. ive been researching a good alternative for about a year now. was looking towards Peugeot or honda hobbit/ express cylinders. which could both work with extra work. but that's another story. now all I need to do is find an exhaust to modify and fit to this scooter. or build one... any one have anything lying around that might work? let me know. thanks
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bluebob71
Scoot Enthusiast
Posts: 192
Location: mt.pleasant, mi
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Post by bluebob71 on Jul 18, 2018 21:50:08 GMT -5
interested in the final product, throw some pics up of it together when ur done gl
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Post by harleyracer59 on Jul 19, 2018 0:20:17 GMT -5
thanks. I might do a build thread. not sure if anyone would care about a non-dio build. plus, its so hard to stop and take pics while working. its always when im finishing up that I think, "oh I should have taken before and after pics. even then I probably wont take a pic of the finished product... ive already started porting the reed windows and cleaning the casting flaws on the case. dug a few trenches for better flow too. have new c3 bearings and seals to install when I finish the cases. im trying to figure out if I can turn my crank into a stuffy crank with 2 part epoxy, sealant, ect. not sure if itll work or if I want to experiment/ try on this engine. maybe one of the af05e? who knows... I have been modifying af09 handle bar and engine fairings to fit on my AB07 chassis. because I cant procure correct ones at a reasonable price. I always say I have more time than money. lol
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Post by ThaiGyro on Jul 19, 2018 6:50:49 GMT -5
so while surfing the old interweb I stumbled across this on buyeee. watched it for a few days then I had to pull the trigger. seller described it as an AF27 cylinder, but this looks like AB07 porting to me. AF27 is a dio way bigger transfer ports. for those that might not know, an AB07 engine was produced by honda from 80'-84'. here in the US we saw them only 2 years in the first generation NB50/ Aero50. had a 40mmX39.6mm bore and stroke. was variated and has better gearing than an AF05. better ports in my opinion, also. this new cylinder is a 49mm big bore with 7 ports. should be a screamer. Hi harley! I am very interested in this. I do a lot of research on various engines, adaptations and such. A few folks ramble on about non compatible parts for 80's Honda's...but I have adapted many, fairly easily. This one is new to me.
Is it possible to get closeup pic's of your cases? Closeup's of these ports? Dimensions? Haha! Maybe too much? I would love to get you a pipe, but my development is slow theses days...too much other work.
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Post by jackrides on Jul 19, 2018 13:12:01 GMT -5
Good epoxy works fine for stuffing cranks. Yes it becomes imbalanced.
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Post by harleyracer59 on Jul 19, 2018 14:13:46 GMT -5
Good epoxy works fine for stuffing cranks. Yes it becomes imbalanced good to know. if you've done it before, what epoxy did you use? im not too worried on the imbalance . I have access to a trueing stand and can rebalance crank. I do know the ab07 uses 6004 bearings. so does honda express and hobbit. shafts are too short on an express not sure on the hobbit. they make a stuffy crank for the hobbit. id love to get dimensions for one and see what might work. other honda possibles are nu50 na50. both express variants. thanks TG. I like your builds too. I think you've mentioned the Peugeot/ honda compatibility before also. the set back I see with Peugeot is most of their pistons are 12mm wristpin. if theres even 1 person interested in my research, I guess im gonna have to do a build write up. TG any measurements you would like, just drop me a message and ill get them for you. that goes for pics too!
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Post by 190mech on Jul 19, 2018 16:35:50 GMT -5
We used to stuff them with cork coated in epoxy back in the day,today with better pipes and ports we like bigger volume cases...
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Post by jackrides on Jul 19, 2018 17:43:55 GMT -5
my stuffing was a long time ago, don't remember what kind.
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Post by harleyracer59 on Jul 19, 2018 18:45:23 GMT -5
We used to stuff them with cork coated in epoxy back in the day,today with better pipes and ports we like bigger volume cases... so are you saying theres no point to stuffy cranks this day and age? can you please explain a little further? ive heard rumors you might know a few things about exhaust both design and construction. lol really though, id take any info advice knowledge you care to give. I know nothing about 2t exhausts. 4t from 1cyl to 10cyl, I understand that. I have a 55 Harley muffler at the end of my exhaust on my 70cc 2t bike engine. runs good though and sounds good to me. lol
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Post by 190mech on Jul 20, 2018 3:53:07 GMT -5
The tech section has some pipe info; 49ccscoot.proboards.com/thread/10395/stroke-pipe-building-information?page=1If you have a decent port layout,a good pipe pulls the mixture through them so crankcase compression is not as important.Jan Thiel did an experiment while he had an RSA125 on the dyno,properly tuned he got 54hp at the rear wheel,Then he removed the pipe and rejetted the engine to run its best,he got only 17hp then!
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Post by ThaiGyro on Jul 22, 2018 0:19:50 GMT -5
We used to stuff them with cork coated in epoxy back in the day,today with better pipes and ports we like bigger volume cases... Us as well! The TZ250's and RS250's we used cork just as described. Super light weight and takes up volume, if needed. I think my little Honda may not need this either...we'll see after FI and all.
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Post by harleyracer59 on Jul 27, 2018 1:45:38 GMT -5
since a few are interested in some of this info, im starting a build thread. its called my tacky aero. ill be adding to it as I get time from past mods, af05 swap to currently cleaning porting trenching installing new c3 bearings in anticipation of the NOS bbk I found while sufing the interweb. hope yall come check it out
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Post by harleyracer59 on Aug 3, 2018 18:40:34 GMT -5
update: cylinder is here in los angeles at customs. should be cleared and finish its journey to me next week. will post pics once I have it in my hands!! cant wait
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Post by ThaiGyro on Aug 8, 2018 7:07:31 GMT -5
Nice thread harley...I had not run across the engine specs. NO Tacts here, but there are older Aeros! One nice older woman drivers hers every day in the village. Brzzzzzzzzzzzzzz, never goes over about 10km! I should by that one!
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Post by harleyracer59 on Aug 11, 2018 17:46:20 GMT -5
thanks TG. so the cylinder came in and it looked nothing like the picture... I just got the case porting finished and put it all back together with new C3 crank bearings and seals. so now im back to the drawing board and notes on my AB07. im thinking either a derbi or Peugeot cylinder, because the cooling fins are the right direction. but the both use 12mm wrist pins. im currently trying to get hobbit crankshaft dimensions. treats makes a stuffy crank with either a 10 or 12mm connecting rod wrist pin, and it uses same bearings and seals as the AB. so does the NC50 express but the shaft on the clutch side is too short. hobbit, express motocompo camino all have same bore and stroke, use same base gasket, but are horizontal engines. so fins wrong direction. stay tuned ill add what I figure out when I figure it out. lol
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