MB100 development

[ryd_or_die_278]

hey hope I don't get it the shit for tagging along in this post, but I read a lot about the manifold/ reed cage / carburettor mods for the MB100 in this post and want to know if someone could give me some guidelines, so I got given this bike when it was runnin a sak of shet think its about an 80' and tryd to tune it beter but some1 decided to cut of the overflow from the carb and change the float height before i got it , I dremeled the shit out of the carb/manifold and tinkerd wit carb needle n float nd got it runin a lot beter, but still runnin shit 2 me, so i know when this bike gets a proper fuel/air delivery its gona be awsum

soooo... i want to get a RD350 intake and reed cage, which year parts should i look for? and does andbody have any good sources? i understand i wil have to do couple mods to attatch these, also what is a good carb that will strap str8 in 2 the RD350 intake?

i know this bike has potential! and i love working on two strokes

again sori if i shudnt have posted here,
any help would be much appreciated , thankz

[koba]

I dremeled the shit out of the carb

Really?

Got any pictures?

[F5 Dave]

Now that RD350s are classic its getting harder. But any yam of the era you can cut off the back of the barrel reed area and weld to back of hogged out Honda inlet and use the manifold and carb. Ie dt175 etc.

[TZ350]

I found the pic of DP's RGV100.

I am sure I have seen those pictures before, just can't think where ....

[husaberg]

I am sure I have seen those pictures before, just can't think where ....

really......... i guess they do look a little like your ones, same bike i guess, so you'd expect that though

[TZ350]

pictures have the same name too ....

[husaberg]

pictures have the same name too ....

What are the chances of that
I think mine was bigger though

[Kickaha]

I think mine was bigger though

That not what your girlfriend said

[husaberg]

that not what your girlfriend said

your right she said "i am the biggest"............

[datfreak]

Hi guys, ive been slow to report (im the guy in oz with the h100a that I want to keep as a pipey street bike) but had some personal problems putting my hobbies on hold for a bit...

Anyways - progress report.
I've received my 2004 cr85 reed block, 28mm carby, throtle twist w cable.

ive started grinding out the reed block entry of the h100 and with a 12mm plate, I think the reed block, inlet and carby should mount up nicely.

I'm curious how to increase the compression ratio - removing the head gasket leaves very little piston-head gap. and doesn't up the CR enough.
And ideas? I was thinking about a thicker head gasket (copper?) and machining the head alot into the smaller squish region. Its hard to figure clearance with the piston dome and the head.

Oh by the way i found another 2 stroke tuning manaul online - see (and save):
http://www.amrca.com/tech/tuners.pdf

its different then grahams bell's book and more information is always handy

[datfreak]

soooo... i want to get a RD350 intake and reed cage, which year parts should i look for? and does andbody have any good sources? i understand i wil have to do couple mods to attatch these, also what is a good carb that will strap str8 in 2 the RD350 intake?

i know this bike has potential! and i love working on two strokes

again sori if i shudnt have posted here,
any help would be much appreciated , thankz

reed and carb from cr85 can be made to fit. The reed bolts have the same pattern, but the h100 barell must be opened up alot.

[F5 Dave]

. . .. Its hard to figure clearance with the piston dome and the head.
...

Bit of solder down the spark hole works fine for me.

Close it up to 0.8-1mm then measure the volume. I've skimed the head till it has no real step from the bottom fin, then created a chamber in that. Easy to get 16:1, but that's now water cooled & on Av gas. Aim for 14:1 if you run say 96 gas.

Aircooled can run with no gasket & ring of loctite master gasket. or machine a groove & fit an o-ring, think mine is 2.4mm maybe V140 or 142 perhaps. Viton material. Need to make the groove pretty wide, but there are charts for that.

[husaberg]

When i did mine i used replicated the air cooled CR80 intake and cut outs with no brake troughs or spacer plates.
I used the Air cooled reed though and a RD250 intake with the wings trimmed.
you reed looks maybe a little deeper(longer) plus the intake seem straight is it?
I didn't take any pics but if Hilleye is still around he has my cylinder. Maybe he could.

this is the air cooled intake which i replicated (note the reed screw cut outs)
but i see that is not how Mike done his re the single port and his has more HP.

[koba]

When i did mine i used replicated the air cooled CR80 intake and cut outs with no brake troughs or spacer plates.
I used the Air cooled reed though and a RD250 intake with the wings trimmed.
you reed looks maybe a little deeper(longer) plus the intake seem straight is it?
I didn't take any pics but if Hilleye is still around he has my cylinder. Maybe he could.

this is the air cooled intake which i replicated (note the reed screw cut outs)
but i see that is not how Mike done his re the single port and his has more HP.

Gosh that's a big hole!
I've gone the other way and put a port on each side of the standard port.
Seems to work great and has to be easier on the piston.

[husaberg]

Gosh that's a big hole!
I've gone the other way and put a port on each side of the standard port.
Seems to work great and has to be easier on the piston.

looking at the pic i would say mine was actually wider.
Never actually had an issue and was surprised when i saw Mikes was a triple port. but i guess his was more area and the single would lose some area esp with the reed bars and outer area.
I tried to find the port map, it is somewhere, but it was within the "Bell specs" for width.
The pic is a std Cr80 ac which was around 49mm bore.
I are still gutted i never got around to running it with a decent size carb.
the CR80ac had a huge bridge port ex, with eyebrow windows and a tiny crankcase and huge transfers std.
same stud patern as the MB100 as well, only it has the MB50 stroke.