sachs 505 with pipe and air filter jetting issue

Cookie /

Feb 09, 2010 03:47PM

hey guys, got a sachs balboa 505 stock motor, the only upgrades are a freeflow air filter and a puch jammy pipe cut up and welded onto the bike.

i have a square bing with a 62 jet in it. it ran fine with a 58 jet in it but had WOT problems. this is all beind done testing on the kickstand no riding (it is raining).

someone on my build thread suggested to go up to a 62 or 64. i tried the 62 (the biggest i have) and it ran but didnt seem any better. after that it will not start. i think i fouled the plug.

give me guidance please oh' 2 stroke gurus.

Re: sachs 505 with pipe and air filter jetting iss

jeff /

cookiemonster131 OP

Feb 09, 2010 04:15PM

okay so i realized the spark plug wire came off. when tuning the carb though i can turn the air ratio screw all the way in and it still runs. to me this says air leak. ... yes?

Re: sachs 505 with pipe and air filter jetting iss

nerdzilla NoPeds :( /

nerdy

Feb 09, 2010 04:17PM

what carb. what motor? i had a d w/12mm type 85 bing 60 jet hi flow filter and a homemade pipe(jamercol chamber and sachs header) it ran proper. 62jet bogged, 58 jet too lean. also i find riding w/weight on the bike is the only good test. wait til its dryer out to get a good reading.

Re: sachs 505 with pipe and air filter jetting iss

Cookie /

cookiemonster131 OP

Feb 09, 2010 04:20PM

thanks man, it is a 12mm 505 engine. i am not sure which letter 505.

Re: sachs 505 with pipe and air filter jetting iss

nerdzilla NoPeds :( /

nerdy

Feb 09, 2010 05:12PM

the letter is important.

all the way in on the idle screw is very high idle. it will run but should rev higher. air leak=no change when its in or out or no starting at all. spray carb/brake cleaner around your seals (manifold,base gasket, decomp...)while yr shit is running and if it revvs out its cuz its sucking in the cleaner which is much more combustible.

Re: sachs 505 with pipe and air filter jetting iss

Cookie /

cookiemonster131 OP

Feb 09, 2010 05:34PM

ahhh maybe that is it, i did replace my decomp valve with a bolt. how can i seal that?

Re: sachs 505 with pipe and air filter jetting iss

Cookie /

cookiemonster131 OP

Feb 09, 2010 06:00PM

seems like there may be a touch of a leak around the decomp bolt. should i just use thread sealant or what....

Re: sachs 505 with pipe and air filter jetting iss

Vlado vlado /

vlado

Feb 09, 2010 07:33PM

get the matching thread bolt at auto or hardware store, cut about 1" from it, cut a ridge to the end where it was cut for flat screwdriver, then clean decomp valve access hole with degreasing fluid like brake cleaner spray or acetone, then dip about 1/2" of the bolt into JB wel, screw in with screwdriver tightly and let set for overnight- that will work, did for me