MOPED ARMY

50+ isn't enough for you?

I agree its not the best kit ever, but for under $200 for cylinder and head with porting similar to that of a metra 80, its not a horrible deal. If you buy airsal, you should know what that means quality wise.

Also, this is the only a55 specific kit, but any puch kit will work.

a55 clutches are pathetic. A35 isn't much better, but I've heard the a3 clutches are much better, and apparently the older ones work in the newer cases.

are you still running the stock a55 ignition? They are limiting and don't allow it to rev much over 10000, so that could be your issue. Try an a35 cdi (and stator) and it will be faster.

I am running an A35 ignition. The A35 Ignition doesnt retard as much as the A55 at high revs but I think the higher compression motor needs it because I have to jet too rich to keep it from detonating. I noticed that really high performance two strokes like my Aprilia RS250 retard the spark to almost TDC at high revs. I think this is partialy to boost EGT's to keep the pipe in tune longer but maybe to reduce detonation as a two storke doesnt have time to cool the cylinder.

With a smaller jet, its a lot faster but the engine really sounds like it gonna blow up at high rpm, you can hear what really sounds like detonation up on top, with richer jetting its quieter but still sounds iffy.

With an air cooled two stroke its hard to tell if its the fins are ringing or detonating. The stock motor used to sound like it was detonating but I could hold it WOT for miles making that noise and it never blew up.

I wonder how fast this would be with a 170 lb person on and 27/22 gearing, still its not a rocket like what some of you guys build here.

Well so much for my html.

Here is some direct links.

http://www.sr20forum.com/gallery/data/1435/medium/built_motor.jpg

http://www.sr20forum.com/gallery/data/1435/medium/moped.jpg

That is a huge fucking fairing...zomg.

I am running 27/20 gearing on my white tomos a35 airsal reedvalve kit and it doesn't shift out of first until 30 and with a sha 14/14 I top out right at 50 on a gps and can carry two people at 45 no problem.

I put on the 20 tooth sprocket the gearing did it , pain in the ass to mill the wheel to take the sprocket.

Well Marvin at Myrons rode it and he liked it, he told me that this was the fastest A55 he has ridden so far. I respect his opinion and experiance highly. Maybe I was just expecting too much and am too hard on myself.

After my pretty sucessful Aprilia SR50 build, I was expecting gains like I got with that engine.

haha..... nice catch Mike.... you riding tomorrow???

It ran really hard, probably hitting around 60 mph once I got the jetting right, then it seized, I guess it wasnt that right.

Yes the plating is messed up, it was a pretty solid seize. I have so much time into the porting that I am probably going to replate the cylinder. Does anyone know if the piston, rings and pin for the airsal kit is avalible by themselfs?

Looking at the parts, there is no sign of detonation on the piston or combustion chamber, the plug looks perfect, medium brown with no signs of overheating or detonation. There is some light browning on the undercrown of the pistons indicating that it got somewhat hot.

The engine was really dry inside. I think that the oil injection doesnt pump enough oil for really high revs. I know I was taking a risk with this but expermenting is sometimes risky.

So the next time I am going to run a little more piston to wall clearance, jet a little richer, check my ring end gaps and run some premix in the mixture.

Its a shame, my prior disapointment was caused by not having the proper plug, the spark was being introduced low in the chamber and the big protrusion was proably causing a weird burn and detonation. When I installed the proper plug, the engine ran hard and I was pretty happy.

It seemed to have good power in the hills and ran great right up to when it seized.

I have a polini kit but I want to try to dial in the airsal to get good information out for those who want to try direct bolt in kits so I will repair the airsal and continue to dial it in if I can get the piston.

did you even brack it in first

my 65mk is way faster now that it brok in and i am runing 25:1

and you are runing it at 50:1 f that run at lest 32:1

you have to think the a55 was not ment to hit high rpms so it need at least 32:1

i like tomos oil injection alot, but its no good for kits. i always say just run both premix and oil injection that way you can cut the throttle down hills.

siezed the same kit twice, 4 rings later i think its dead.

~SABAT!

The problem is very simple. You need more oil mike. Alot of people confuse rich/lean mixtures with oil mixtures. The fact of the matter is that you were probably running a decent air/fuel mixture, but you were probably not running enough oil, hence the inside of your motor was dry.

First off, the oil injection for tomos. The oil injection was meant specifically for the stock 14mm carb. It provides a 50:1 oil mixture for the 14mm carb only!!! If you look closely, the oil injection is purely mechanical and provides oil on a linear basis according to RPMs. If you're using the 19 Dell, you're definitely going to need to premix.

Another note, when people play with oil mixture, they forget one thing! When you increase oil say from 50:1 to 40:1, you are going to need to upjet. The reason is that because you have more oil in your gas mixture, the less gas molecules you have going into your combustion chamber.

Hope this helps!

holy crap dude, sounds like some really good stuff. fantastic workmanship, but as i've found with a lot of people who go from other motorsports to mopeds, there is quite a bit of nuance to these funny little beasts.

the simonini is a dog in the midrange, you're going to have to lighten the second gear shoes to get that back, you'd probably be much happier with a different pipe. i dont like that one very much but it does kill on the top end.

definitely siezed due to the oil pump issue, premix and rich at that. Aprilla designs the RS50 at probably 6 or 7 to one safety factor for all engineered components, so when you double the performance you are still well within the design limits, tomos engineers at a 3-4 safety factor, if that, so quadrupling the power output, which has a 10-20 fold impact on stress in the parts, is really exceeding the limits of the parts. the main challenge with these isn't so much getting the most power out of them, its getting the most power without having to rebuild it every weekend.