My winter project is a Batavus with laura m48. I have purchased a dellorto 15/15 carb, intake adapter, and a biturbo pipe. I am also looking into milling the head in order to up the compression. I was wondering if any of you know a machine shop that would do this for me. I have read that you can shave them up to 0.08.
i do these for about 25 bucks a crack, i've got a jig and stuff. its about 3 days turn around from when i get it to when i ship. email me. (profile)
Do it, Graham will save you lots of time and frustration which comes with doing it yourself.
http://www.mopedarmy.com/forums/discuss/7/77707/77707/
i've done a couple batavus, they pick up a little. exhaust porting helps them quite a bit a long with a pipe.
Cool, I just emailed you.
If Graaham can't get this right in and you need it quicker just give me a shout .
Raz
Milling the head and the base of the cylinder is the best way to produce power, along with porting. The exhaust can be bumped up and widened along with the transfers. It is really hard to go to far when porting these cylinders.
I am in no hurry to get the head done. It is the still really cold in Michigan and I probably won't be riding until march( maybe late feb. if it warms up). But if he doesn't have the time I would definatley look you up.
Do you do the porting with a dremel? Should I do it myself if I have no experience with porting?
Kinda off path, but on my M48, there is about 3/16 of a gap in between the piston and top of the cylinder. Wouldn't it be smarter to machine the cylinder down instead?
that big of a gap? that seems quite large, perhaps there are too many base gaskets on or something? Changing the base height changes your port timing, so you have to be careful doing that. if you put your piston at bdc and the top of the piston is under the lower edge of the transfer ports, it could be too high.
Porting a cast iron cylinder is pretty easy and more forgiving than chrome and aluminum. Get some fine dremel stones and widen the exhaust about 2 mm on each side and about 0.5-0.7 on the top. Draw the lines in first so you dont loose track, do all your measurements with a calipers. You should at least read jenning's section on it and feel like you understand it, before you try.
Dont forget to clean out all the grit and metal shavings before putting it back on.
That and a clamp on 2 pc biturbo should make for a pretty solid 35. Dont forget to up-jet. The encarwis are super easy to get at the jets, and they use bing jets.
No, there is only one thin base gasket on it. I'll take another look at it, but I think my batavus is gonna be my project ped, complete with rigid rear suspension and an e50.lol
TaylorN.
Taylor, your correct there is a huge gap, all the M48 engines have that. There are two different cylinder heights and they vary in 1mm increments. Mill the base of your cylinder to bring the piston crown to the top of the cylinder then go in with a dremel and enlarge your ports. I have done this and it works very well.
I don't think I need to worry about up jetting. I got a 15/15 Dellorto carb and a intake for it.
devin..by any off chance have you made an intake for an m56 as of late? we spoke early fall about the m48 intakes.
I'm waiting for this farking snow to stop. Curse you Canada and your giant mass of Arctic air!
Still no intakes for the M56.
Devin, how much do you currently charge for the delorto 15 and intake with cables? And how much for a porting job and cylinder milling? finally ready to do it.
Hahaha, I can't wait until it stops snowing either. Guess I'll just have to wear my toque.
Want to post in this forum? We'd love to have you join the discussion, but first: