Lil Blue ETon Beamer Build

[df41590]

Have shroud off, All the exhaust bolts are tight. Forgot to but just checked, squish is 0.026"/0.66mm. The other thing i'm thinking is when I removed oil pump for delete. I notice the mounting surface was flat, so I decided to just remove the gear off the end of the pump and put it back in. Wondering if the gear on the crank is whats rattling. If it isn't that pretty tempted to just drive around within pushing distance of my house, and see what if anything breaks.

[Zino]

Your exhaust pipes moves left to right when you rev it mine doesnt move at all .
Is it just the camera or are they loose .

[Zino]

That is tight squish But you still could be ok not running premium gas
Look at your plug and check for detonation .
You would be looking for silver specs in the nose of the plug that is bits of aluminum .

[aeroxbud]

That is the real close on the squish. Normally 0.7mm is as low as you want to go.
How did the piston line up to the transfer ports? If it's low you could gain some by running a slightly thicker gasket.

[df41590]

Just removed the crank gear for oil pump still making noise. I watched the exhaust it is rigid when revving it, trying to move the exhaust while running doesn't change the noise. Think i'll throw the shroud & seat on it go for a quick ride in the neighborhood since the carb seems happy w/ the tune, and see if the noise changes.

[df41590]

Polini didn't give any squish specs, but I am running 91 octane non-ethanol. Don't see any specs of metal on the spark plug.

No clue how they matched up ports wise i'm still wet behind the ears when it comes to 2 strokes.

[Zino]

This what aerox bud is talking about
you want the piston at bottom of stroke to be below the exhaust port and even with the transfer ports
This way you maximize the port timing .
Which is flow in and out of the engine

[df41590]

I'll can pull the head and check the port-BDC correlation. Would I be able to reuse the base gasket, I used yamabond? . It was weird the last time I started it, it was much quieter the only thing I changed was going to a smaller MJ. Possible i'm getting a partial misfire from being too rich or just a coincidence?

[Zino]

Maybe you just wore it In .
As long as you dont wreck the gasket .
Reuse It .
You also can buy gasket paper at oreillys ,auto zone ,napa and cut your own .
If you need a base gasket template .
I can upload one that would be very close and you can adjust it

[df41590]

Hope so.

I may grab some 1/64" gasket that'll raise it to about 0.836mm.. Thanks but I learned my lesson w/ head nut torque, check the forum 1st. I'm sure I can find a template on this site. I may go one town over and pick up some 103 octane racing gas, see if that changes things.

[Zino]

Yeah try the race gas first .

You have no detonation signs on your plug .
Your power is good .
The plug looks in the right range If it is a new plug you might be on the rich side by a jet .
It looks like the mixture ring from that angle looks washed off by fuel
If your temps stay good .
I dont know if I would stress too much on the rattle if it has got better it might be wearing in or the jetting is helping.

[df41590]

Wish I didn't fill it up all the way. Will rig up something to run the racing fuel see if it makes any difference.

The plug is new has maybe 30-45 mins of run time on it mostly idle. Currently have a 90 in it the next one down in my kit is 85. I'll see how it runs tonight w/ a smaller jet and the racing fuel. Temp never gets over 180 at idle and only got up to 200 after a short ride. 350 is ideal for WOT under load for these AC motors, think I saw that on mopedarmy forum?

I'll just monitor it, too anxious to ride this thing.

[Zino]

Your temps sound real low .
So you may have room .
You want to be jetted so that you level off under 350 degrees after a long wide open run .
I acid test my builds at 5-6 mile wide open run.
We use 350 as a general rule to give you a margin safety most builds have another 30-40 degrees before they seize
What you never want to see is temp spikes that dont level off .
Proper Jetting provides 80 % of the cooling

On my vinos with Malossi kits and street pipes in 2 miles of mostly wide open I am in 280-300 degrees .
They peak and hold temp around 310 degrees most days .
ON more humid days that might get closer to high 320's

[df41590]

Ran some of the racing fuel made no difference w/ the rattle. Was louder today when I started it. I decided to take it for about a 2 mile ride was 240*F afterwards(90MJ couldn't get it past ~3/4 throttle). Noise would vary in how loud it felt like being and especially noticeable when rpms were dropping during coasting. Shrug. Just gonna focus on getting it running right for now. Went down to 85MJ still wants to cut out and sputter at ~6500rpm if you snap it, can get it up to 7500-8000rpms if you really ease into throttle. Before w/ the stock cylinder and exhaust I could run the 85MJ the only issue was it not wanting to start until it cooled down.

[Zino]

Not being able to get past 3/4 throttle is that because the carb bogs down ?
You really should be revving up in the 8500 plus rpms with your set up
What weights are you running they may be a notch heavy ?

I would pull the cylinder head and take a look .
From your screwdriver test that had some sound there.
Make sure you dont see scoring from a wrist pin walking out .
Take a picture and post it up ,Use the fan to move the piston in position