Honda SFX

[TruseiC]

Hello, got another scoot to mess with.
A Honda...Again...
Got it for around 50$(30€) it was fully disassembled, But turned out it was missing only belly pan and piston rings.
Assembled all the engine, fired right up the first kick.
But then again i got unlucky with honda engine, as it turns out every single time....
Cranks bearing seats were not in a good shape, but i tought everything would be fine, because you guys make slip fit bearing seats on purpose,
but i guess it was too lose and made really bad grooves on the seats later on, and the engine made very bad noises while running.
So dissasembled it again, got to the fact that i need a new crank, bearings seals.
Got new bearings and then the fun part came on. Ignition side case's bearing seat were so loose, i could put the bearing with no heating or hammering at all...
I have no idea how did i miss it, but yeah, understood that i cant get cases like mine for a reasonable price (Honda dealership offered me 150€ for the small half and 190€ for the big case half + shipping from Japan) so i put the honda engine in a box, and placed in the deepest garage's corner, for a better day to come for it.
So later on a very good offer showed up on our scooter forum, minarelli drumbrake crankcases, ignition, flywheel, drivetrain, and a dead crank for 25€
So then started welding, grinding, swearing etc.
Got the subframe inside the frame with a loooot of struggle, but i did it.
Then assembled the engine, by the way, i did a LC conversion so i had to make a room somewhere to fit the radiator, which was a hard choice, because there are no space under the fairings...
So the engine setup was.
Stock ported cylinder
Leovince ZX pipe
Stock transmission with malossi red springs, both clutch and contra spring.
17.5mm DellOrto carb.
Top speed was only 80km/h because i couldn't get the carb in tune.
So i drove all summer without no problems and no fairings
Then came Scooter Season closing event as usual in my country.
I got ready, put on all the plastics, lights and changed the belt before the ride.
After 110km's driven a fcking brand new belt died, when removed my cvt cover, just a bunch of debris from the belt fell out... I was pretty pissed cause i was more than 100km from home and my scoot is not moving...
Got the scoot home on a trailer, later discovered that crankshafts splines are ripped too...
Soo about next season...
Planned setup for engine.
Dr Evo 70cc iron cast cylinder
Im still thinking about the pipe tho.
17.5carb
Stock transmission
Stock crank
Inner rotor ignition
Hope it all comes true.




I will sort out the text later on, when i will be home @ pc

[90GTVert]

You listed a stock crank for the future build. You may want to check into aftermarket cranks if you'll be buying a new one. I got a Naraku for near the price of a new stock replacement. Not the best crank out there, but it seems to be better than stock.

[TruseiC]

Im very sure that a stock crank will last long enough.
Friend of mind ran ported dr evo on a stock crank
And with ported i mean hardcore porting, it peaked at ~12k rpm's.
Ran for 2 full seasons

[TruseiC]

Found a couple more images.
Forgot one of the hardest failures of this scoot - the front fork self-dissasembly while riding.
So, a day earlier, did a lot of wheelies and sometimes happened to put the front down harder than i wished to do, but didn't notice any damage or anything, only the next day i noticed that steering feels really weird.
Lucky me, driving in my friends yard, not more than 20km/h and suddenly it feels like hitting a REAAAALY deep pothole, but in the fall, i noticed that my front wheel w/ shocks are going forward without me...
Yeah, the fork broke apart...
Found in garage layoing around a Malaguti's fork with shocks, wheel etc.
But it didn't fit in, so had to chop off the mount for fork, and add malaguti's mount which i got from malaguti frame which was also laying around.
here are some pics.
Work in progress.





Later on i will post pics with the result.

Some pics from summer

[iwiketuddlz]

Very cool bro!!! Seems your radiator doesn't get air threw it?? What are your temps??

[TruseiC]

Oct 21, 2015 16:20:12 GMT -5 iwiketuddlz said:

Very cool bro!!! Seems your radiator doesn't get air threw it?? What are your temps??

Thanks radiator doesn't get much air when plastics are on, but still running 80-90C°

[proarturs]

You have put so much effort in this build, the only thing that I don't like is that this is a ... Honda.
Although if It was a Honda Dio with a Minarelli engine, that would be super cool.

Good luck with the build.

[TruseiC]

Hello, it's been a while since I've posted something here, so let's begin with all the changes.
Re-done all the engine mounts, totally different position, had to do a lot of frame chopping, grinding, welding, but it's done.
Re-done fork mount, now it's as straight as it could be.
And there are major changes in the engine setup, planned setup is:
Stage6 Sport Pro MK1 Cylinder (got it already)
PM Tuning crankshaft(High end stuff)
DIY Exhaust (already in progress)
19mm or 21mm Carb, can't really decide on this one)
Modified stock ignition (Advanced timing and maybe lightened flywheel - not done yet)
rest of the parts are planned to be stock.
Now fairings... the dam* fairings... i have no idea what to do with them, but at least a fresh coat of paint is a must-have. but planning on something custom made...
That's it for now, now the pictures.


The start, calculated the pipe using www.underdogsracing.com/fospipe/


Printed and cut out



Made some progress already.







Frame work (nevermind the S6 pro replica, not mine)
All the pic's for now.
And btw there is a reason, why progress is so slow, now i got another problem to worry about, and it has a 2 stroke engine too....


if someone interested, i can tell more about that thing. 

[TruseiC]

The update that im hyped the most about - wheels!!!
Saw a pair of SR50 wheels for sale at our local forum, and i didn't think too much, called the guy, arranged a meeting, picked them up and preeeeety happy with what i got.

The tyres are not in the best condition, but i think i got them real cheap.
Wheels + tyres + brake discs = 40€
Offcourse i couldn't help myself and test fitted them


Can't wait to see the scoot with all the fairings on.
That's it for now.

[TruseiC]

A little more progress.
Painted frame and gas tank