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Post by Reign on Mar 18, 2010 16:31:15 GMT -5
From the base (where the base gasket sits) to the top (where the head gasket sits) is almost exactly 68.5mm Probably closer to 68 though. Again, I'm really sorry about that. At least you're figuring out a way to make it work. Hope it all goes well for you in the long run. I guess 40FM's arent the optimal choice for BBK.
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Post by drawkward on Mar 18, 2010 17:22:05 GMT -5
So it's about 4.5 mm off. I'm installing a 5 mm spacer. How much will .5 mm affect my compression?? Don't worry about it Ben. It was my fault. I should have taken the time to measure. It says all over the eBay ad "Make sure your cylinder height is 64mm!" and when I got all of my measurements for the pin size, piston size, and what not, I forgot to measure the cylinder height. You've done enough for me as it is, so don't beat yourself up over it. I probably could've returned the kit anyways, if I wanted. But I don't ;D . As long as you keep helping me out when I have problems, we're cool! PS - I hope you don't mind... But I stole your idea for the painted floor grips... ;D  |
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Post by Reign on Mar 18, 2010 17:30:48 GMT -5
As long as you keep helping me out when I have problems, we're cool! Which I will, seeing I'm the only one here that has the same engine  |
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Post by drawkward on Mar 18, 2010 17:33:46 GMT -5
Which is another thing I didn't think about... I mentioned that my top end took some abuse when it overheated... Well, the head melted a little on the inside, and the piston burnt a little... The cylinder was fine... If all else fails with the kit, would you be willing to ship me out a head and piston w/ rings?
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Post by 90GTVert on Mar 18, 2010 19:18:47 GMT -5
Most head gaskets are about .5mm thick. You could use copper spray instead of the gasket... unless it's an o-ring setup.
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Post by drawkward on Mar 18, 2010 20:58:52 GMT -5
Interesting. If I decided to use the gasket provided with the kit - how much would that affect my performance?
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Post by drawkward on Mar 18, 2010 21:13:31 GMT -5
Just received this email from Carlos: Hello, "I see!
no! you can not use the 5mm spacer.
it's different design engine,the stage 6 product also from my factory.(it's a Germany Brand they own 3 brands,Stage 6,Motorforce & NARAKU)
they are all made in Taiwan.
Trust Me!I know the Chinese thinking
your engine is special one,in fact it's 65cc engine not 50cc.
because,Yamati use stroker cranker increase torque power it also will increase displacement,
we did it in Taiwan abut 15 ~20 years ago.
your engine should be the same with first photo with 71mm cylinder high
the second photo is 64mm it's standard Yamaha JOG.
for the past 5 years,only Yamati engine have this special cylinder.
I will send you this longer cylinder + Piston kit for exchange,
you can send the cylinder+piston +Gaskets back to me.
thank you & B.regards,
Csrlos"
Attached (kit he will be sending to me in exchange):
Jog 50cc:
 I am awaiting a response as to whether or not the kit he will send me has a performance increase or not. |
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Post by 90GTVert on Mar 18, 2010 21:43:35 GMT -5
So if he's right and you have 65cc with a 40mm bore, you'd have around 90cc with a 47mm BBK. That's hard to believe, but it would be very nice for you. Anybody wanna measure the stroke of their FM? Should be 50+mm if he's correct, or you have a larger bore than 40mm stock. Most of these engines have the bore size in their engine number though, and it is a 40 still.
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Post by drawkward on Mar 18, 2010 21:47:17 GMT -5
It's just amazing to me. I must have some other restrictions, because my brother (definitely a 50cc minarelli) and I (1E40FM) rode with each other. He had better acceleration, and I had better top end. When I hit my powerband, I would cruise right by him.
This is going to be GREAT if I end up with 90cc or so. Just can't believe I'm cruising around on a 65cc engine.. just doesn't feel like it.
Yes, someone measuring their FM stroke would be fantastic. Carlos seems to know his stuff though.
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Post by 90GTVert on Mar 18, 2010 21:50:55 GMT -5
If your brother has a scoot that isn't an RX8/Triton/etc... style it may not have the same gearing as you. Our scoots have gears better suited for higher speeds so the others are often faster off the line but get lost on long straights.
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Post by drawkward on Mar 18, 2010 22:01:36 GMT -5
So I may even have higher gearing stock. Not something to complain about! I just may end up with a hell of a scoot here. Ben - if this works out for me, you might even want to consider using that spare engine you have!
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Post by drawkward on Mar 19, 2010 7:14:08 GMT -5
I sent him some follow up messages last night asking if he had more information about the 1E40FM cylinder. I told him there was no information about them on any english sites on the web, so I was hoping he could tell me so I could post about it. I also asked if there was any real performance increase, seeing as mine was 65 cc stock, and the kit would be 70cc? This was his response:
Hello Josh,
O.K.
I have a idea. you can keep the cylinder.
I also will send you the correct cylinder kit.
You can keep it (you will have 2 cylinders)
Bore x Stroke 40x39.2 this is Yamaha JOG data,
the China engine maker will not tell the true data.
also have scooter maker selling 90cc scooter with a 50cc sticker.
the 90cc engine with a 50cc license it is illegal.
they will not tell truth only until you split engine to check.
the new one you will get 71cc but it's 48mm bore size.
by the way,do not forget install performance exhaust pipe & big carburetor.
Pre-Mix Oil to gas tank is necessary,because original oil pump only for 50cc engine,
pre-mix ratio 1000cc gas+ 250cc~300cc oil.
maybe the variator & roller size also different with other 2 stroke model.
if you can get the measurement will be better.
some of model 2 stroke install Honda variator too.
let me know.
thank you & B.regards,
carlos
Is he for real?? I now have an extra cylinder? This is beyond good customer service.
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Post by 90GTVert on Mar 19, 2010 7:48:15 GMT -5
Wow. Can't beat that!
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Post by 2strokd on Mar 19, 2010 9:37:06 GMT -5
Carlos is the man ;D! Thats cool of hell of him to do that for ya  ! Im happy for ya man! See, ya start doin good and good things happen. Well not always but ya get my point  lol. I knew ya had to have more than 49cc,s if your piston came right outta the barrel  ! Thats good info ya got from Carlos, i stand corrected. Did you tell him you are a member of this fine forum? |
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Post by drawkward on Mar 19, 2010 14:50:26 GMT -5
Sure did! Maybe that's why he was so nice about it...
Follow up email from Carlos:
Hello Josh,
the parcel was ship out today!
never mind , i want to help people,I know some of workshop & ebay seller only selling parts don't know what happened with the engine.
I work with the scooter over 15 years in Taiwan.
we also tuning the 50cc engine to 125cc ; but don't try it, it's only for race & Prize (money).the 125cc will become unstable,
the cylinder will make to 71cc ,this number is base on standard 50cc,
I search every where ,still can not to get any information.
the first,we have to trust it,it is 50cc , with these 2 cylinder will be 70cc.
before you install it!
some of skill you have to know,maybe you already know it.
upgrade to the 70cc,the displacement increase 20cc,
you also need to increase fuel follow to cylinder. exhaust pipe also have to upgrade too.
for quickly take away hot gas.
Oil also have to increase.
which web shop you bought the stage 6 spacer?
the spacer is aluminum made or paper made ?
have a nice day & good weekend.
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lol.
! Thats good info ya got from Carlos, i stand corrected.