batavus, new reed block slower top speed

Eric Brissette /
batavus-cnc-reed-block-complet-2T.jpg

Treatland recently started selling a new "high perfomance" reed block for the M48.

I got it expecting a little more speed? Acceleration? After installing I cant break 30mph, before installing I was getting a little over 30mph top speed. I have a 13. 13 sha currently w 72 jet and a MLM circuit pipe. Why would i be loosing a little on my speed?

Haven't spent much time with it but does seem to have a little more pick up than before.

Re: batavus, new reed block slower top speed

Totally normal JBOT /

Rejet.

And you should probably port to get larger gains as well

Re: batavus, new reed block slower top speed

72 in a 13 sounds crazy rich. 60

Re: batavus, new reed block slower top speed

operator error 696 420 /

> pat splat wrote:

> -------------------------------------------------------

> 72 in a 13 sounds crazy rich. 60

It depends…

Yea that 13 is small, I’d definitely step up to a 15mm carb.

Post pictures of the old reed block. It might of flowed better….

Re: batavus, new reed block slower top speed

Dirty30 Dillon /

> 666 420 wrote:

> -------------------------------------------------------

> > pat splat wrote:

>

> > -------------------------------------------------------

>

> > 72 in a 13 sounds crazy rich. 60

>

> It depends…

>

> Yea that 13 is small, I’d definitely step up to a 15mm carb.

>

> Post pictures of the old reed block. It might of flowed better….

15.15 requires a new intake and some janky cable management compared to the easy 13.13.

Re: batavus, new reed block slower top speed

What size is your intake?

Re: batavus, new reed block slower top speed

Eric Brissette /

I am using original intake, here is a pic of the new reed block next to stock one

reed.jpg

Re: batavus, new reed block slower top speed

Isn't the original intake like 11mm or something? I'm no expert on M48 but you want your intake to match your carb otherwise it's restricting your flow.

Re: batavus, new reed block slower top speed

Stefan Josheski /

Maybe sounds stupid, but how thick are the new reeds conpared to the old ones? Afaik thinner ones will be better on low rpms and that might be the problem

Re: batavus, new reed block slower top speed

I just put the same set up on my Mobat. I ended up going back to the original one as the new one kept my engine idling at a low roar but would not accelerate. I think I did something wrong.

Re: batavus, new reed block slower top speed

EH 📣FCC of the QCB /

> Stefan Josheski wrote:

> -------------------------------------------------------

> Maybe sounds stupid, but how thick are the new reeds conpared to the old

> ones? Afaik thinner ones will be better on low rpms and that might be

> the problem

No this was my I tail thought too. The reed material might be too thick to open as much as the stock ones. You might need thinner reed material.

Re: batavus, new reed block slower top speed

operator error 696 420 /

Stock kit with performance parts = big mess

Re: batavus, new reed block slower top speed

I made my own batavus big reed adapter kits and actually sold a few back in 2008 or so. I noticed the same thing at first, the reeds are so small and stiff they barely want to open stock.

I had to go to the 13 sha, then I eventually ended up with porting and decking a m56 cylinder and ended up low 40s. (edited)

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