my 180cc street toy

[narx]

Hi everyone, I'm 24 years old, from Croatia, let me show you my bike.

Bike is based on a malaguti f15 frame, which will be modified to fit 180cc piaggio engine.

No special styling here because I don't like those show parts, fancy paintjobs and shit, bike is intended for everyday street use.
My idea is to modify stock part as much as possible, I got malossi head and multivar with the engine , otherwise i don't think I would have bought it.


Engine spec:

-slightly modified 180cc stock cylinder
-minarelli vforce3
-stock pipe with 34mm homemade header
-28mm OKO carb
-stage6 intake manifold
-malossi head (0.8mm squish clearance)
-malossi mutivar


Other parts:

-250mm TJT front brake disk
-SR50 paioli RS3 shock absorber
-cateye cyclocomputer
-stage6 temperature display
-aerox front rim
-customized panels


This is bike like it was with 70cc dueplus setup.

I bought used 180cc engine, after teardown it turned up to be in a very good condition.

Minarelli vforce, spacer was needed and a bit of case grinding to fit it.

Note that case grinding was done with assembled engine

Pipe header modification. Not a big deal, just a piece of cutting and welding. Stock header was restricted to 27mm. SIP scootershop claims +1 hp over stock for their 34mm header.

Before

After

Exhaust outlet matched to 34mm pipe header.

Some cylinder mods to enable better mixture flow to the transfers and boost port.

Crappy Malossi head was centered on the cylinder very badly so it had to be recentered for use with tight squish clearance.

Another head mod, +2 hp

Everything is ready for frame mods. I bought a runner 180 frame and engine mounts will be welded to the firefox frame.

Carb pics. Thanks to Emo for getting me a nice and cheap carb

Paioli shocker.

Radiator, from some 125cc dirt bike, it's really huge.

That's it for now, update soon.

Cheers.

 

[Tom.#86]

Nice. It seems you know what you are doing. Keep up the good work. :winner:

 

[Bart.T@zipsp]

A really special this one, i am curious how its going to run

 

[Robbert.]

A 180cc piaggio-engine on a firefox :love:

It guess that it's gonna look very nice and it's gonna have plenty of power 8)

 

[Wieger]

yeah nice, but the only thing i don't like is the grinding at the intake for the membrane, just with the crankshaft still in there 8P. but you sealed it well i guess..

keep up the good work. cilinder looks good.

 

[Browni]

Not bad, If I see well the exhaust port is still the original in timing and wideness too so the total port area is quite small, and you enlarge the outlet to 34 mm, don't you think it's too big for that little port?
In my opinion it will be better if you widen the exhaust port to 45-48 mm, so you will have torque too.
The other think is the 28 mm carb vs. standard exhaust.. I hope you have the exhaust without catalyst.

Even those BGM needles are very tapered, but I hope you can adjust the carb. I did some 180 cc tuned runner engines, and they need a quite thick and not very steep needle.

It will be a nice and very usable street bike..

 

[narx]

Not bad, If I see well the exhaust port is still the original in timing and wideness too so the total port area is quite small, and you enlarge the outlet to 34 mm, don't you think it's too big for that little port?
In my opinion it will be better if you widen the exhaust port to 45-48 mm, so you will have torque too.
The other think is the 28 mm carb vs. standard exhaust.. I hope you have the exhaust without catalyst.

Even those BGM needles are very tapered, but I hope you can adjust the carb. I did some 180 cc tuned runner engines, and they need a quite thick and not very steep needle.

It will be a nice and very usable street bike..

Yup, exhaust port is still original. I know everything you are talking about, and I'll port the exhaust but first I wanna run the bike for a while to see the performance so I can feel the diference. No dynos here
I've measured port timing and it's 170/120, I thought of 185/125 with, an exhaust port 70% of the bore diameter. Still have to run some calculations about that. What do you think?

Exhaust is without the catalyst.

Have you tried those BGM needles with a 28mm OKO, I know I would probably need a very thick needle, which one do you use? They have some strange needle codes, not same as keihin, so keihin needle chart is useless.

Thanks for the nice comments guys

Few more pics:

 

[Browni]

Yup, exhaust port is still original. I know everything you are talking about, and I'll port the exhaust but first I wanna run the bike for a while to see the performance so I can feel the diference. No dynos here
I've measured port timing and it's 170/120, I thought of 185/125 with, an exhaust port 70% of the bore diameter. Still have to run some calculations about that. What do you think?

Exhaust is without the catalyst.

Have you tried those BGM needles with a 28mm OKO, I know I would probably need a very thick needle, which one do you use? They have some strange needle codes, not same as keihin, so keihin needle chart is useless.

Thanks for the nice comments guys

185 degree exhaust duration is good for a street usage! I've used a custom made needle for the configuration! I made it on a lathe, and than I fine tune it! But you can find needles for a Keihin PWK carb..

 

[Big B NRG]

What happend to your manifold

Great project, it will be nice to follow. Maybe you can use a Mikuni Needle on your keihin (visaversa works). I got a mikuni needle from a carb. that came of a 125 machine.

 

[nickelaas]

Nice projekt. wounder where you find your radiator ? have to have one.
give me a memo where you find it pleas.

best regards nicklas

 

[narx]

What happend to your manifold

Great project, it will be nice to follow. Maybe you can use a Mikuni Needle on your keihin (visaversa works). I got a mikuni needle from a carb. that came of a 125 machine.

Oh it's an old manifold I got with the engine, I agree it doesn't look too good
I didn't know I can use mikuni needles, that's great. I hope I'll be able to tune the carb with those BGM needles but it's always useful to know that, thanks for the info.

Nickelaas:

I am sorry I don't know which bike is radiator from, I got it from a friend for few euros, he said it's from some 125cc dirt bike. Unfortunately cap has been broken, I'll have to fix that before I mount it on the bike. It's really big, I'll have to put it behind the front wheel, that's where stock radiator was anyway.

 

[jedmaster]

great bike!

nice project sir!

 

[maksy22]

Pozdrav domaćen čoviku

 

[narx]

Pozdrav domaćen čoviku

You'll have to write il english dude because this is an english forum, so everybody can understand.

Pozdrav i tebi

 

[narx]

Slow progress because I don't have much time for the bike.
Few pics, don't mind a messy garage, it's rented and not all stuff is mine.

 

[rrmike]

I like this, you take what you have for a frame jig. Keep up the good work.

 

[narx]

Finaly frame is almost ready, don't want to mess with the welding so will let the professional welder do it.
Better safe than sorry
Few pics...

 

[san2]

i really really like this project, sumthing ive been thinking of doing on my aerox, or even a bigger bore cylinder

 

[nachi]

Thats a nice mutant project. Good Work.

 

[narx]

Frame finished...