EXPERT Advice needed on my 555cc engine - Lots of videos n pics -

[Filipe_500]

Hi all!

The valve clearence is around 1mm. The clearence between the cylinder and de piston is 0.05mm /  the clearence between the cam anda the shim, is 0,04-0,05mm / the cam journal clearence is 0,03-0,04mm.
This is all measured alrdy.

What i didnt measure yet is the valve spring, and the buckets, which i could feel that they area bit loose...


What really concerns me right now is, when I stoped the bike because the strange noise I heard (which i found out that was the valve hitting the head of the piston)  I found out that i had a lot of oil leakage also, the oil light turned on just before i stop.... that concerns me too....because i dont know what effects could this cause on the lower end of the engine.... (the bearings... rods, and so on...) The engine was really hot, I can tell you that.... I took the oil stick out and i saw a lot of smoke coming out of the engine heheheh...
( the engine didnt run without oil cuz I put more oil than i should, by accident, so it was running with around 300ml more oil...)

Another explanation for this noite, could be the compression ratio..... I guess its around 12:1 right now, cuz i[m using, as I said before, a 0,7mm milled head + this high compression pistons....  and the gasoline around here have 25% of alchool, wich decreases the octanage to 89 points and i[m still using my DP8EA-9 sparks pugs as well.... i suposse i need to buy the DPR9EA-9 right...


I'm now worried about the lower part


thx,
Filipe

[hmmmnz]

there isnt much you can do reguarding the bottom end. mabee a beefier oil pump, it will either handle it, or it won't deal with that if it comes around, which it probly will soon enough as the bike has done 80,000km.
you may need to think about making your mixture richer to try and keep the bike a bit cooler, and spend more time cleaning the plugs,

[Bob Broussard]

If a rod bearing starts to go bad from lack of oil, the piston will start hitting the head.
As the bearing gets worn away, it allows the piston to move farther up in the cylinder.
This could sound like it's a top end problem since the noise is higher up.
If the bearing was really gone it would start knocking down low as well.

Pull the head off and watch the piston movement while you rotate the crank back and forth.
The piston should move immediately when the crank moves. If there is a delay it means the bearing is bad.
The piston might even show signs of contact around the outer edge.

[Filipe_500]

hi all!

thx for ur help!

I[m going on vocations now, will be back on the 4th of january.... then i will send this engine to a suzuki dealear wich is speacialist on engine mods in a city around 1 hour away from mine....
hope i have good luck this time!

thx a lot!

[Bob Broussard]

Have him degree the cams.

When the head is milled it has an effect on cam timing.
I milled a scrap head just to see how much I could remove. It has the spark plug area cutout so I can see the valves move. It changed the timing enough for the valves to almost touch each other as the intake closed and the exhaust opened

[rob1bike]

+1 on the cams.
Read the racers corner on the main page.
Enjoy your vacation!