Water Cooled Suzuki 220 MRB

[Gunny]

[soosh]

Just gone through and had a good read and look and the unfortunate cracks and breakages ! ! Doh !
I had a similar engine misshap on my malossi 225 ....
First noticed that there was a hairline crack inside the crankcase mouth when is had to replace the ring pieces , i thought Na ! that'll be fine as long as its bolted together tight ! ! Hmmmmmm
Anyway then i noticed the stator plate kept having to be replaced ( 3 times ..dont ask ! !) because it kept cracking and rubbing on the flywheel .then i noticed a crack from the top of the case allllllllll the way down about 2" to the right of the crank tapper ...
At this point I couldnt strip it because in about a weeks time i was going to be riding from Rimmini to Elba (Yes Italy and no i didnt ride down from England to Rimmini ) So the only cure was to specialy make up a piece aircraft steel and fabricate to the case to hold the cases together ...Ok i bolted a strip of metal to the cases and hoped it would hold ..
Hey and it worked 500miles ,loads of abuse and a burn out i made it back to Rimmini........
BUT a week or so later we rode to Bourton -on -the water for a Ment-To-Be record attempt that unfortunatly didnt happen so on the way home me and a friend where hammering it but im managed to cook my bike due to cylinder head leaking Doh ! Limped home and after removing the panel ,flywheel cover ect ect my specialy engineered seet strip had lost a fixing and i could now see crank throught e top of the caseing ....When stripping the rest of the engine the crack had worked itself down to the kick start shaft and the main case had a crack from where the reed was all the way down to the main bearing and cush drive spindle ,my newly fitted tuned malossi piston had cracked crown.....................
Another case sourced , welded ,tuned and put back together and dyno'd and just under 27 hp on tap she's a ripper and has been running a dream .....

Dude,just playing around on the scooter help site with the gearing calculator.Your old T5 at 10000rpm was doing 87mph It was doing just under 70mph in third. When you think how much you pay on a Lambretta to do that speed and how much you paid and it was still 125cc.

[Toppy]

Could i ask what Sean is doing in the last pic to the t5 barrel?. As im doing a t5 reed valve engine and is looking for tips

cheers Mark

[sean brady scooters]

I was enlarging the transfer feed cut outs in the spigot...

[Toppy]

I was enlarging the transfer feed cut outs in the spigot...

how much can you take away? or is it down to engine spec?

[sean brady scooters]

as we all know the T5 motor has loverly big transfers in the casings....and barrel.
its just that the spiggot cutouts as they are restrict these by almost 50%
they can certainly be cut back to gasket surface height.....

[Toppy]

ahh i see cheers for the info. i know some tunners dont like giving info away.

[hungdog]

Got any pic's of that finished T5 barrel Sean....please

[Toppy]

Got any pic's of that finished T5 barrel Sean....please

yeah that would be great

[sean brady scooters]

I,ll try to get some pics up soon,of the spiggot cut down to gasket surface if thats what you want to see...
But,theres more that can be done on these....
I,ll try to explain as best as i can for now until i get some more pics taken and posted...
If you are familiar with the malossi 166 ,172 and 210 kits you may have noticed that all the pistons have holes in them (about 1 cm below rings)which only on the 166/210 kits line up with ,and feed directly into the very short transfer passages...and so giving a much shorter route for the intake charge from behind the piston crown into the trans...another advantage of this is piston cooling.
for some reason the 172 kit (although the piston has these holes )...differs in design with the extra long passage walls...hence blocking this beneficial effect.
so basically the transfer port inner walls on a malossi 172 can be cut right down ,and well below the gasket surface until they line up with the piston holes at BDC.....