New rider

[BlasterAzores]

AutoLube removed
carb rejeted for 290 mainjet
air filter cover removed
TORS removed
dual stage carbon valve reeds
4º key
stock reed cage... yet... dont know wich to choose
custom cut fenders... made i myself
flipded front rims... few extra inchs for free, best trick so far.
6 inch + 6 inchs rear wheel spacers... custom made.
Stock exaust... i know it sucks... coming soon vitos fat bastard
Stock shocks... even worst... coming soon yfz450 front shocks with djdiamonds widening kit / honda 450 rear shock.

My first problem !
I´m running 25:1 full syntetic oil and its the second time i´ve melted the piston...
First piston was original yamaha (rings gave up)
Second piston wiseco +5hp piston ... ran it for 600 miles and "melted down".
Any ideas if i oil ratio is correct?

I´m pretty new at atv riding, only 6 months, this is my first Blaster and i´m having a Blast..... any coments or sugestion are well apreciated.

Thank you all

 

[coreyownz]

do 32:1 ... or i run 50:1 when the oil pump isnt runing

 

[CC&Fabb]

run 32:1

 

[BlasterAzores]

go 32 liters of gas with 1 liter of oil ?

but wont that make lubrication even more poor?
Or to much oil is just as bad as too little ?

 

[BlasterAzores]

broken not fried

turns out that after taking the engine apart the piston wasen´t melted, the intake side skirt broke to pieces, luckly no damage to cylinder, just need a new piston.

Should i go whit WISECO or NAMURA ?
Anyone wich is best?

 

[flyers42091]

Wiseco.
BTW a piston skirt braking on the intake side is usually a sign of incorrect jetting, or to much piston slap. So check your cylinder bore, my need to go up a bore even if its not scratched. It could be ovalled. Also a 290 is probably way to big for a stock pipe. With just reeds, you shouldn't be running more than a 250 max.

 

[Braapbraap95]

yeah, go wiseco indefinetly. and oil mixture, my opinion is just as good as any's but i do 32:1 with klotz super techniplate.

 

[BlasterAzores]

Thank you

Wiseco.
BTW a piston skirt braking on the intake side is usually a sign of incorrect jetting, or to much piston slap. So check your cylinder bore, my need to go up a bore even if its not scratched. It could be ovalled. Also a 290 is probably way to big for a stock pipe. With just reeds, you shouldn't be running more than a 250 max.

Thank you for your post, i´m going to do all that, makes perfect sense cause i´m using the 290 with the needle in its lowest posicion (clip all the way up).

 

[newnick]

Your needle might be to lean and your compinsating with a bigger main, not the best way to run a motor. Also get a regular piston, not the one thats notched. Get the cylinder measured first before buying a piston and determine which size you'll need.