51mm to 55mm bore?

KINGÔäó · Post by **KINGÔäó** » Mon Jan 10, 2011 2:36 am

I already have it ported for my 50mm charmo bore, will it fit a 55mm bore? Im using a 50mm sef full counter crank, Don't need to change my bore right now but would it be more reliable to use, because, when I hit 70mph I always feel like the bore is about to seize in my mind. Just need your information and experiences with 50mm and 55mm bores.

fastplastic · Post by **fastplastic** » Mon Jan 10, 2011 8:26 am

thats a tuning/jetting issue if it feels like its gonna seize not the bores fault

veedubh20 · Post by **veedubh20** » Mon Jan 10, 2011 9:03 am

big stroker bore need to bore out crankcase in order to fit.. 51,52,54,55mm piston, it is not bolt on!

50mm is the max can without cutting case..

if you like go fast! buy a jog and spend $2,000.Polini crank,bore, big evolution pipe. Dio big stroker will not keep up, on polini jog.70cc/ 84cc/94cc

bakaracer · Post by **bakaracer** » Mon Jan 10, 2011 9:53 am

You want to keep the bore to stroke as square as possible so your setup right now is good. What does the engine do to make you think its going to seize?

KINGÔäó · Post by **KINGÔäó** » Mon Jan 10, 2011 9:37 pm

Im using 100:1 oil right now is that whats making my bore heat up to much???

I just put in 1.5 once a gallon of that oil as I've been doing for a while.
stroker 98cc so tell me what ratio of oil I should use. I've been using 50:1 before and used 100:1 I don't feel a difference not in temperature. But only when I hit around 70+mph it starts to rapidly heat up so i have to slow down. plus is a water cooled kit more better to use? give me your information and opinions.

bakaracer · Post by **bakaracer** » Mon Jan 10, 2011 10:01 pm

are you using amsoil?yeah 100to1 is not a good ratio.50to1 is to thin too. when your getting up to that speed,the rpms is getting up there so more heat will be created.plus I bet your compression is really high and your using pump 92 octane gas.32to1 is the least I would mix and rejet to adjust to the richer mixture.

KINGÔäó · Post by **KINGÔäó** » Mon Jan 10, 2011 10:13 pm

so 32:1 is the way to go?

castor is the way to go.

808BMW · Post by **808BMW** » Tue Jan 11, 2011 12:04 am

You are using castor at 100:1?

Definitely go to 32:1

bakaracer · Post by **bakaracer** » Tue Jan 11, 2011 1:22 am

check your compression. to high a compression can cause the same symptom too if your running pump gas 92 octane. ALL of the aftermarket kits sold must be run with a octane no lower than 95.stroker kits if run with a high compression must run race gas due to the compression ratio(15to1)

veedubh20 · Post by **veedubh20** » Tue Jan 11, 2011 1:32 am

if the motor seize once, then motor will wear anytime on the street. premix 100:1 , 50:1.

Im sure will get more metal shaving flakes on the button crankcase.

KINGÔäó · Post by **KINGÔäó** » Tue Jan 11, 2011 3:12 am

808BMW wrote:You are using castor at 100:1? Definitely go to 32:1

was one test haha.

i wen take out the oil and put some castor

maddog · Post by **maddog** » Thu Jan 13, 2011 6:59 pm

dial in the trans, my old sef bore kit loves heat thats why its no longer made.

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51mm to 55mm bore?

51mm to 55mm bore?

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Re: 51mm to 55mm bore?

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