Motorized bicycle engine geometries PART 2
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- เผยแพร่เมื่อ 7 ต.ค. 2015
- All right folks. Here's the latest knowledge of the big 2 stroke engine geometries that I have now. This new video features a somewhat new geometry that is showing itself to the MB scene. CR Machine can offer top end kits for all the big engine geometries. This video will help you find out what kind of engine you actually have. With this knowledge, you will be able to purchase the correct top end kit for your engine.
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Thanks for taking the time and offering some clarity on the various engine geometrics. Your nomenclature is sensible and straight forward.
Just got one today . It's advertised as 100cc with high compression head from eBay.
Took it apart and I' can't say how much happy I am for the hours I've spent watching these videos. So I found one transfer port nearly 3/4 coded by an actual peicthat was cut from the jug or sleeve and the other ports had lips for the size of the hole I'd say them lips was pritty big.
So my motor has a rod AE80 that bronze colour metal
this is the one and only fred- been at it from the beginning! thanks for all the great info fred- i hope youre driving around in a cadilac or mercedes and you have a crew doin all the work for you. you certainly have been committed to these contraptions and making them run well. thanks again
my favorite all time 2 stroke China doll video ever. fred really simplifies a confusing topic fully understandable even for amateur. love it
Thanks for the info and awesome job explaining that mess
definitely less confusing now, just subbed
Thanks, these things don't exactly come with an owner's manual. TH-cam and the kindness of strangers saves the day again.
Thank you.I'd never done anything with a 2-cycle except trimmers,and that was clean carbs and adjust.New engine was given 2 month ago and I saw casting peaks along the inner edge,against the cylinder surface,of the intake so I took it apart.Good thing as 1 of the ports also had quite a bit there too and would've broken off into the cylinder eventually.Anywho..I was able to see these things you're describing, and know what I have.I now know what to expect,and what I can,and cannot do to maintain or enhance.(I do want to get your 55 later)Thank you again for your complete explanations of connecting rods,pistons,and the cylinder heads and volumes.
took a sec to unconfuse myself lol good stuff thank u sir
Nice, just diving n myself, head first as always
So which is the best engines some say the pk80? and which are the best rods/pistons 38 or 40?
Thanks, just bought the 6.0cc head from cr machine excited to get it, any tips for best performance before I install the head on this engine?
Hey Fred ok I have a question. The CDH motor that had the ZL Long rod was it Caged or Non Caged bearing on the Crank?
Hello I need help! The kit I purchased won't run right. I took off head and noticed that at BDC MY INTAKE ports are not visible.
Is that normal? Did the wrong piston come from factory? I have the low hole piston.
Is the ZAE80 a 38 or 40 stroke? I can find an original wildcat pk80 with that no mark rod think I might order it, but idk might get me a new kit. Old one lasted 7,500m getting a Rebuilt on it and is my tester motor.
Dude you are f73kin awesome.
I have the PK-80 Piston with the unmarked rod. I need a crankshaft with the rod and haven't had any luck finding it. Will either of the Z-L type rods and crank work with my engine?
Is it possible to use your stage 1 GT-5 top end kit 66cc on the 2 stroke GP 460 engine or what engine kit can I use to achieve 65mph
Thanks Fred, you always do a great job in your explanations and they're very helpful.
This was the first O habe seen of the "A-80" engine and I also didnt know we had a "PK80" out there now that has a Z-L marked rod that actually has a caged lower bearing.
All I have had or seen have had the loose pin bearing on the lower journal.
I ordered two cranks from MZmiami last year and both are 40mm stroke Z-L marked with the loose pins on bottom.
haven't used one in an engine yet, should I use these type Fred or am I just looking for potential failure with the loose pin cranks?
When the piston pin is through the top dead center of the piston is that position c LOL?
Hey Frederic Chelminski can u tell me plz how good ist de gt5 engine with a ZAF80 rod I bought one recently named GT7 pro Racing and I would like to know how good this engine is and if you recommend it, thank you for helping your fans. Greetings from Ecuador
Can you convert a "pk-80" crank to run in the "gt-5" case, cylinder, and type B piston? Would that need the "a-80" rod?
Hello, my engine have F80 stroke.this is 38 or 40mm?also have type b pistone and 40mm intake.
My engine has a copper colored Z-L rod with a type A piston. What do you think that might be?
which kit comes with the unmarked PK80 style rod? what site?
Hellow. Can you tell me if JSF50 rod is the same with ZAE50. Thank you a lot.
now they have zl40mm rid crank that's 39.5mm stroke and it uses type A and type B pistons I have one
Thanks now i know that i have a PK-80. It was quite obvious with the type a piston and the uncaged Z-L rod.
hi fred i just got a engine from cdh but i see you don't talk much about them i need more information on it to do all my upgrades
How do you check the stroke of your engine
Mine is stamped AF80 high hole.
Can't find info on motor like buying rings
I've got a BT80 top and a type b piston with a ZL rod?
Any info on a AF80? I need a new cylinder
So is the a better piston in the 2?
I have a zae 80 were can i buy the righ jug for it
Dear, Frederic Chelminski, I've looked at my engine finally after a year to figure out what it is, it has the con rod from the A-80, so 40mm stroke. ( the Z-L, gray, and it has the counter sunk oiling holes that are not centered.) But it has a type A piston, does this just mean I have a normal pk80 engine? Or is it some kind of A-80 Pk80 half breed. BTW it was a flying horse bought from bike berry.
Hi. I believe you have a PK-80. I do not know of any Z-L rod halfbreeds out there. Thank you.
Thank you very much .
I just purchased the Engine FH-BEK 80 from Bike Berry. From all this I've figured it to Be the PK with the Z-L Rod and Type A piston. Bike Berry calls the Piston a Number 4 but it has 2 stamped on the Crown. Top end of rod is Caged Bearing and boy are they a loose fit. I suppose you have a Top end that would work on this Fred ?
I have a pk80, I put bad oil in it and now its dickered, and there is evidence of combustion within the crankcase, I think it happened because the stock exhaust has way too much backpressure.
Mine says ZMN has anyone seen that one before? I need to order a new cylinder body but I can't find anything about ZMN anywhere.
me too
do you have video about brakes?
I got two Motors Fred and wanted to see if you can help me out on what type of motor i have. I got a ZAF80 & ZAF60?
Hi Mike. Both of those engines are GT-5 type. Be careful about the ZAF60. I've seen several of those have loose connecting rod bearing journals.
Zl 40mm is short rod motor?
what is a af80 rod has any one seen or heard of that rod i know it a type b what engine is that
What is the better un top speed
Hellow mi dear , may be u cant tell us what cain of type is the gt-7 pro racin thta its sold in gasbike.net just for in case i dont recomend this store they dont sent what they show in the website store.
Awsome but the rod dont say nothing ?is it still a a 80
You should make a new video on all the new engines out race and non racing everything has changed now different strokes different heads that must mean longer rod also the 40 pistons don't fit all engine there's different bore sizes to no matter what engine you buy there never the same anymore internally it's all changed some are being sold as 66cc some 80cc but the new barrels seem to be the same size some have longer rods those ones have a different head.
I believe it's possible that some engines come with the wrong piston type installed! I have a ZAE 80 rod which is not featured in this vid AND the difference in actual con rod length is not specified, nor any specific measurements therefore, I still have no idea which crank I have; it originally had a type A piston but I have measured the stroke and it has a 40mm stroke. So...god who knows.
What about a F80 rod?
I have a type A piston but my rod has ZMN marked on it. I believe it's a halfbreed 38mm engine, am I correct on that?
Bingo! You got a halfbreed. That is an excellent crankshaft. This video was made before these cranks came into the market.
do you make a better wrist pin bushing or needle bearing for the half breed
No, I don't
Whats the difference between 38 mm stroke and 40mm?like,does the 40 put out more top speed as to the 38 mm does more torque?
What exact crank do I need balanced racing crank for a Zeda 66/80cc bottom end?
How many mm exactly is a Zeda 80 rod and what racing balanced crank can u use?
Exactly the opposite
give me link of first part
I have a no name b piston rod and its grey like the zl rod so im comfused
If it's a type B piston (high wrist pin location), then you probably have one of those CDH A80 engines. It's like a GT-5, but 40mm stroke instead of 38mm. I sell top end kits for that geometry. Here's a link www.shop.crmachine.com/product.sc?productId=202&categoryId=16
Dude my motor is a older gt-5 and it has a AF60 rod pls help me figure that out
I Had A Old GT-Grubie 66cc Skyhack. It Had Zaf-80 On The Piton Rod.
I have a znm stroke engine. Does anyone know what type of engine this belongs to
Halfbreed baby!
CY rod??
My piston hole is in the middle with a zL 40 mm rod and what's better 38 mm Stoke or 40 stroke this is In my 80 cc 47 mm piston and I believe in mt anbull 100 cc 50 mm piston I think its a 38 stroke rod
What tipe is zae80 rod is 40 mm o 38 mm ?
I have the same question myself. And the video is labeled as 38. I just order one and are claiming It's a Long Rod High piston hole
Zl40mm??
You tube needs to make it to where we can post pics in blogs
I have a F80 stroke engine can anyone tell me what kind of motor I have please!!!
Me too, can anyone help us out?
GT-5 engine
Fred, plz. I have an "FM 80" stamped rod with a type "A" 47mm piston. 8mm fine thread head studs. Originally it had the 32mm small intake bolt pattern jug, broke off exhaust studs so changed jug to a 40mm intake jug. I still dont understand if its a 40mm stroke or otherwise?
They might be new
What type is the gt-7
i belive its the Gt-5 i tray to know to
It's a 38 mm stroke the rode is a ZAE 80 it's all about setting your rings right when you take off your cylinder you will notice metal bands on your piston those help keep gas and vapors from looking out the NGK spark plug is what you want with some Opti 2 oil it always has a ballenced crank it's a really good engine
Ive got a rod with CY on it? anyone got one of these?
PK-80
yep i have one also
stack them up
zl40mm rod takes type A and type B pistons 39.5mm stroke
The one I have looks like the one third from the left. But it says AF 80 on the rod.
Marc Serina the AF80 rod is used in the GT5 engine
Thanks! good to know. In your experience how does the GT 5 compared to the triple 40. I ordered a triple 40 months ago, got tired of waiting so I ordered the gt5. Just got word that the triple 40 is coming in a couple days. Trying to figure out which engine I should use. although I'm going to keep them both. I have two four stroke builds but I'm a newbie when it comes to two-strokes bicycle engines. I'm still working on my first build.
The triple 40 is a better engine for sure. Especially if you bought it from Zeda motorsports their port work is great. The intake and exhaust ports are tiny on the gt5 and more restrictive compared the triple 40. FYI you can interchange the cylinder jugs with these 2 engines only, They have the same port map.
I just bought this new cylinder jug with slightly larger port and it has the round exhaust port opposed to the oval port on the GT5
rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F192208124535
Mine says ZAF60?
i got a zaf 60 also
i got a zaf 60 also
Same here and I'm in Australia
I am pretty sure they are 38 millimeter stroke
Put a polini evo sylinder and crank
I have the half bread engine
AF80 rod
there is a yd rod
Zeda 80 is what my firestorm says
Yeah. That's a A-80 geometry. It's like a GT-5, but it's a 40mm stroke. The ZEDA80 engine is a copy of my GT-5L geometry.
Failed c-clip took out my top end what do you suggest I do do you sell Firestorm so-to-speak top ends?
I've been looking everywhere for the flat G clip with the holes for the wrist pin as I'm not trying to have another failure with a c clip
Any guidance towards quality wrist pin clips I'm sure we all can appreciate
Have you checked out www.treatland.tv ?
Fred imma see you soon....im done with robertzedacrook.com...i cant justify spending $450 for a 44mph motor and get a screw when i order a gasket....a filter when i order a pipe.....a gas tank when i get a motor....dude is a crook
UNIQ_P call him out for real so people like me know where not to shop...
Watch my channel
ZEDA MOTORSPORTS eeds to come intern with you!
your naming of A and B pistons is backwards from some EBAY sellers. . this lesson cost me
Bill Kratzer it was more than a and b it was half and a lil off of half..sorry for ur mistake though
Bill Kratzer trust me Fred knows more than eBay. Hahaha! He is right trust that!
type A pistons pk80 is long
type B pistons gt5 is short
AF80 rod