Honda Dream50 - Is bigger also better?

In this episode we check if a bigger carb is actually better on the Honda Dream 50.
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[@kldd-bu1dx]

The CB50R has the exact same head as the cb50v / w (also with the 18mm inlet). you can check this be comparing the items codes (they are the same). The 50r has different camshafts and is fitted with a PC20 carb.

[@VintageGarageYT]

Ah didnt know the blok itself was the same. Finding cb50r cams is pretty hard though 😭

[@vivianbond7449]

What about change the cog what on the chain goes on how many teeth has the front cog got mate and how many teeth has a black cog on the back wheel to mate ? Would it help the ratio

[@VintageGarageYT]

Probably, maybe it is producing more power, but because of the gearing it doesn't really show, also thought about that

[@kldd-bu1dx]

I was wondering is you also modified the insulator between the carb and the intake? The original insulator has a diameter of only 16.5mm so if this is not modified the bigger carb won't do much. I'm planning to do a test with the original 50R carb (PC20) and see what this will do. For test if want to modify the insulator and taper the intake to fit the PC20 Carb.

[@VintageGarageYT]

I checked it and thought it was the same diameter as the intake? Or maybe it has been modified before. Would have to recheck it Definitely let me know what kind of difference a PC20 makes!

[@vivianbond7449]

Check there is a new air filter in the air box mate Because of the old ones block that I’d be making it run Rich to

[@VintageGarageYT]

It looks clean, but havent really tried, maybe I should see what happens when running without one

[@vivianbond7449]

@@VintageGarageYT you would have to do the fuel and air screw though if you take the airfillter out mate

[@nielsdebakker3283]

Off topic: On a ape50 I gained 2000 rpm (8.6k -> 10.6k) by going from the original 13mm to a pz22(18mm) shengwey keihin copy with fitting manifold. This still connected to the original filter and housing.

[@VintageGarageYT]

That's a massive gain! On the Dream it didnt change much. I would even think the original carb gets a bit more torque down low.

[@ClassicTrialsChannel]

​@@VintageGarageYTthe Smaller carb will be better at low revs. It's always a balancing act. More top end at the expense of bottom end power or better bottom end, but lose at the topend.

[@VintageGarageYT]

@@ClassicTrialsChannel yes, exactly! There was not much noticable gains on top, so I reverted back to stock.

[@vivianbond7449]

How fast did it the bike Go mate lol

[@toadinthehole8085]

The size refers to the inlet side of the carb.

[@VintageGarageYT]

Where the filter or filter neck mounts to? Pretty sure on the PC20, that's a lot more than 20mm?

[@peterjohn3180]

How big is inlet bore? If smaller with a step then it wont work as well. But for decent power 18mm is still small. I think there is a choice of cam? For it to make use of 4 valves (?) Get a bigger inlet and fit a 24-28+. The 50cv race bikes h used 28 mm in 2 strokes and 4 strokes use bigger ones usually. Bit of a gimmic the dream,,50.... Should be making 10+bhp! At 15000 rpm!

[@VintageGarageYT]

Inlet is 18mm, casted into the head, so in order to get more out of it I would either need a new head or change this one, which I wont be doing. The dream50R has a bigger inlet, 6 speed and a bigger carb from the factory, I think those actually make close to 10hp

[@peterjohn3180]

@@VintageGarageYT ah, I wondered what the different ones had, seems bizarre to make several twin cam heads for them.

[@VintageGarageYT]

@@peterjohn3180 yeah they are really different. The R is also not road legal and much more rare. Only 1000 of them were made in 2004

[@peterjohn3180]

@@VintageGarageYT I wonder if you can get aftermarket parts? Cost a fortune probably. For a 50, I'd want to get the full 10bhp...

[@VintageGarageYT]

@@peterjohn3180 there are some parts available, but rare and expensive. The easiest way is to swap it for an 88cc kit, but that's not my style. The bike actually runs amazing from the factory, I honestly dont think I'm going to change much on it. Also because if something gets messed up, replacements are very expensive..

[@vivianbond7449]

Does that bike have reeds power reeds ? That’s it in the barrel from the carburettor

[@VintageGarageYT]

What exactly do you mean here?

[@vivianbond7449]

@@VintageGarageYT where is the carburettor goes to the barrel you’ve got an inlet manifold it’s got four bolts undo four bolts and is there a plate there with reeds behind it with bent arms on it to mate like your rd50 should have them to ?

[@vivianbond7449]

@@VintageGarageYT wish we could send pictures on here and you would see exactly what I’m saying

[@VintageGarageYT]

@@vivianbond7449 ah no, the dream has no reeds. Carb goes straight through the valves into the piston

[@toadinthehole8085]

It's 4 stroke not a 2 stroke.

[@vivianbond7449]

Has that Bike got a manual choke and was the choke off or still on when you was riding it

[@VintageGarageYT]

Yes manual and off indeed

[@vivianbond7449]

@@VintageGarageYT is the air filter new in the bike and not blocked up to mate

[@VintageGarageYT]

@@vivianbond7449 not a new one, but it is clean

[@kazunari420509]

Ich ersetze es durch Keihins pc28, aber der Ansaugkrümmer ist aus Harz, daher kann ich mich nicht für die Einstellung entscheiden. Außerdem wird der Kraftstoffverbrauch schlechter und die Geschwindigkeit und Leistung ändern sich nicht. Ich kann nicht sagen, dass normal das Beste ist, aber ich denke, es wäre dumm, Hondas Meisterwerk zu modifizieren. Als Japaner bitte. Bitte fahren Sie im Normalmodus herum.

[@VintageGarageYT]

I wouldn't call testing a carburator stupid. It's not like I'm hurting the engine or doing something irreversible. There is nothing wrong with doing some small tests. But if you are wondering, the original carburator is back on the bike.

[@kazunari420509]

貴方が正しいです。 カスタムの楽しみ方がよく理解できているとも。 大変申し訳ありませんでした。

[@VintageGarageYT]

@@kazunari420509 no worries 😁

[@kazunari420509]

​@@VintageGarageYT appreciate. and wish you luck.

[@VintageGarageYT]

@@kazunari420509 You to!