Honda Spree and Elite 50 Forums

Ciao tutti,
Glad to meet you all.

I am more a Vespa guy, but i also have Honda Shadow 50cc - '97 restored but i need your help to manage to conversion to big bore kit.
Initial conversion to china big bore kit failed in ~ 1000 km due to soft seize.

New setup for this year:
- Pinasco kit with 47mm piston diameter.
- Pinasco head
- Ported intake case - already done previously.
- Leo Vince SP3 - Dedicated for Shadow/Joker 50cc - very rare i think. - mounted already
Question -
1.What carburator should i use and what main and pilot jet sizes ?
In this moment i have the original carburator that is very small.
2. What gear set should i buy for transmission, stock this scooter have a very short gear ration and the top speed at max RPM with the china 72cc was 60km/h. I want to go a little bit but , let say a top speed of 85km/h.

Thanks a lot.

Hello,
Scooter is an autentic Honda product, is was sold also in USA with the name of Honda Joker SRX50 or SRX90. (50cc / 90cc ) - Made in Japan from what i know. Also mine is made in Japan , but there are few also made in Spain.
I am not to familiarly with Honda Scooters but the engine si similar to a Honda Dio 2 - 50cc.
Usually i buy parts for the engine and transmission that are made for Dio 2 - 50cc or Honda Bali 50cc.
There many copies of this scooter on the market made in Taiwan but all of them have 4 stroke engine vs 2 stroke on this one.

Couple of details that could help you to help me:
- vacuum actioned fuel pump
- mecanic oil pump for 2 stroke oil
- carburetor is Keihin PB12 or PB13 - with 2 stroke oil port above mixture screw and automatic cold start electrovalve

From my point of view the failure of china big bore kit was this small original carburetor that i tried to tune a lot and i have run with 97 main jet and 45 pilot jet on stock air filter box.
Usually the soft seizure appear when i let off the throttle ...

Now with this details i hope that somebody have some suggestions for me.

Hello,

I also own a Honda scooter like yours but I must admit that your scooter is nicer than mine.

Greetings:

The red - on - Chrome scooter in the pics above appears to be a Chinese machine sold as the "Venice 150" among probably many other names. That is no Honda as far as I can tell. The only badging I could see in your pictures is stamped on the belt cover, which also looks like no Honda I know of. Honda does tend to place its name on cowls, saddles, etc. A close-up of that belt cover name could convince me otherwise.

Wheelman-111 wrote: ↑Sun Feb 19, 2023 10:21 am Greetings:

The red - on - Chrome scooter in the pics above appears to be a Chinese machine sold as the "Venice 150" among probably many other names. That is no Honda as far as I can tell. The only badging I could see in your best fat burner for men pictures is stamped on the belt cover, which also looks like no Honda I know of. Honda does tend to place its name on cowls, saddles, etc. A close-up of that belt cover name could convince me otherwise.

Yes I think you are right. Red scooter appears to be a Chinese machine to me also.

Chonda

Greetings:

Quoth MeatBall:

Chonda

Tha's funny rat thar1

Hello all,

Below you will find couple of pictures that will prove that this is a genuine Honda scooter and not a Chinese clone.
Now couple of details about the build:
- Pinasco BBK with 48.5mm piston ( Since my kit was a NOS one found on shelf , i didn't get the rings for the piston and took me a while till i found them)
- Pinasco head that come with the kit.
- I have the original Keihin PB carburetor with 16mm diameter exist
- LeoVince SP3 exhaust.
- Original air box with original air filter.

I started the engine based only on the oil pump and no premix added.
Runs quite decent till it warm up and ones is warmed up is felling like low compression engine. ( Today i will measure the compression at cold and warm)
This Keihin PB come original with:
- 85 main and 35 pilot jet
Since i am not willing to destroy also this kit by soft seize i change the main to 98 and pilot to 45 , problem is that is running to rich at wot on standstill lots of smoke (unburnt fuel) and if I let idle more than 2 minutes it will flood and stop. Needle clip is in mid position , and in the moment is sound and run with no / less smoke between 1/2 and 2/3 of acceleration.

Any suggestion how to jet this carburetor in my situation.

Second part of the pictures attached below:

Needs more air…bigger carb, intake and pod filter. Thats a much bigger slug than stock so it needs a supporting cast. Its breathing through a straw. Also need a temp gauge for tuning to avoid damage.

Hello all,

For the moment i am stuck with a issue of flooding the spark in idle and then engine stops.
I drove it a little bit couple of times, then i took a compression test and at cold a i had 130psi. I decided to take the head gasket off, but was not notable, then I mill couple of times from the head till i get a squish off 1.1mm. This raised the cold compression to 150 psi.
Also i have change the followings:
* main jet from 98 to 92
* pilot jet from 45 to 42

It runs ok with with throttle from 1/4 to 1/2 i didn't pass 1/2 , and at constant 1/2 it brings me up to around 45-50km/h. If i stop the scooter keeping my hand in gas at 1/2 the spark plug will be brown. If i am coming to a stop and let idle for 1-2 minutes it will start to run lower and lower in rpm with lots of unburnt fuel coming from exhaust till engine stal. If this happens , then is very very hard to start it again, but very hard.
For the moment i order a chines copy of an Keihin PB 19mm style carburetor. ( I think my carburetor some how is bad)
Any other suggestions regarding this issue ?
What other carburetor should i buy , most likely i have to change the intake with different style on carburetor side ?