sleeper06 Posted November 23, 2015 Report Share Posted November 23, 2015 I would talk to someone that knows those engines I've run Honda 250r with that static on pump a few times the uccr was still 12:1 with static that high . Bike is together for 6 yrs now running pump . I'm not familiar with suzukis Quote Link to comment Share on other sites More sharing options...
broke400 Posted November 23, 2015 Author Report Share Posted November 23, 2015 Ya these old ones r goofy with reeds under head. My machine shop is goin to mill head then i will check compression again and play with fuel a little c what happens i fixed alot of the wiring also. thanks alot I will post results Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
lil Doobie420 Posted November 23, 2015 Report Share Posted November 23, 2015 if u mill the head the compression will be thru the roof...i bet but im no builder Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 23, 2015 Report Share Posted November 23, 2015 Ya these old ones r goofy with reeds under head. My machine shop is goin to mill head then i will check compression again and play with fuel a little c what happens i fixed alot of the wiring also. thanks alot I will post results Sent from my SAMSUNG-SM-G870A using Tapatalk Do not mill that head to fix squish with out figuring out the gaskets. You will turn that crank in to shrapnel with more compression. Are you a mechanic? Quote Link to comment Share on other sites More sharing options...
lil Doobie420 Posted November 23, 2015 Report Share Posted November 23, 2015 hmm. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted November 23, 2015 Report Share Posted November 23, 2015 Like I said call someone who knows these machines , don't go shaving anything and deg don't take a head to s local machine shop send it to someone that deals with these engines on a regular . Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 23, 2015 Report Share Posted November 23, 2015 I am pretty sure the stock head gasket is supposed to be in the .040 thou range. Can't remember what the base gasket should be. Yet you still have quite high compression with mega squish, and with the compression you are saying it has, that head has gotta already cut well beyond .030-.040. Taking more material off could be disasterous. Quote Link to comment Share on other sites More sharing options...
broke400 Posted November 23, 2015 Author Report Share Posted November 23, 2015 I was goin to get the squish rite then check compression if its to high do some chamber work to get it down. Headgasket i took off is .55 pretty thick was goin to start with .20 of head base gasket is about 20 i could just use yamabond and get it down think that mite b better Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
broke400 Posted November 23, 2015 Author Report Share Posted November 23, 2015 Prob with callin someone is everybody knows til u spend money and find its junk and they dont know shit i have been looking on forums but they r nothing like here. Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 24, 2015 Report Share Posted November 24, 2015 If there isn't any porting, figure out what OEM gasket thickness is. I rebuilt one for a guy not long ago and it was a .040 head gasket for sure. I'll see if I can get a base gasket size on one of the parts receipts. Get the cylinder sitting where it needs to be, then get your measurements. I'd bet the head has been milled, but doubtful that it's been rechambered. Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted November 24, 2015 Report Share Posted November 24, 2015 I wouldn't worry so much about the static compression. I would try to figure out what your compression ratio is. I know my stock 125 kicked about 175 psi. I think most 250s are around the same. Banshees seem to have a low static compression compared to other two strokes Sent from my VS990 using Tapatalk Quote Link to comment Share on other sites More sharing options...
registered user Posted November 24, 2015 Report Share Posted November 24, 2015 180psi and .070-.080 gap is pretty typical of most any stock 250 engine. comp ratio is likely 11-12:1. jerry hall knows quit a bit on them suzukis. if i were you i'd probly send the parts to him Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 24, 2015 Report Share Posted November 24, 2015 180psi and .070-.080 gap is pretty typical of most any stock 250 engine. comp ratio is likely 11-12:1. jerry hall knows quit a bit on them suzukis. if i were you i'd probly send the parts to himHmm, the LT I did in the summer kicked upper 160's and had about .060 squish on OEM gaskets. Quote Link to comment Share on other sites More sharing options...
registered user Posted November 24, 2015 Report Share Posted November 24, 2015 thats why i said typically a 250cc will be in that range. some may be outside that range alittle but probly not by far. the ktm and honda are right in that range. i would bet yamaha and kawi are right there also. your 160 may be a result of a gauge thats slightly off or maybe it really was 160 and thats just how it was back in '86 on that particular engine. hard to say. ive said it a thousand times about static pressure. to me and alot of other people it meens jack shit. the stock 250 engines are low comp ratio even if the static pressure seems otherwise. its still baffling why so many people put such emphasis on what a gauge says Quote Link to comment Share on other sites More sharing options...
registered user Posted November 24, 2015 Report Share Posted November 24, 2015 if you want to know what most 250 engines are just stroll through thumper talk. i can tell you the ktm is just a couple thousands under .070 if the piston is at zero deck. i have no use for a compression testing but a million guys have posted their results on thumper talk and a few other sites. 180ish range is about what they are Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.