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# Thread: Whats the bore and stroke of 78 cm^3 bikes

1. ## Whats the bore and stroke of 78 cm^3 bikes

hi
can anyone tell me with certainity Whats the bore and stroke of 78 cm^3 bikes like doom habib etc,,
also heard that they accept honda cd 70 piston and rings...? is it true?
what piston and rings they accept?

2. Originally Posted by asjdsm
well guys i checked the bore and stroke of dhoom it comes out to be
bore=46.8mm
stroke=50.9mm - 50.3mm
as u see the stroke is at least 49.5mm the values obtained above it are due to the domed sized of piston and a small circular depth at the centre of piston ,, reading were taken at different pointd from piston ,, those taken at the higher place of piston gave 50mm and at lowe places of piston the readings were51.3

the stroke was calculated as it should be .. at TDC the piston was approx 2.05 to 2.3mm below the cylinder top face .. and definitely stroke was not calculated as the depth from the top of cylinder rather as from the top of the cylinder where the piston surface lies at TDC..

so the end result is the 78cc labelled engines are not actually 78cc but 88cc... proved..
Na kr yar!!!!! Yani meri wo UNIQUE 78 88 thi? Nhn yar. Agr han to shame ful hai only 90 kmh top speed.

3. my dhoom is confirmed 88cc and so it is doom,,
the problem may be due to its camshaft design and the pathetic 15.5 m carb,,,i made a new thread use that please for further discussion the basic question posed by this thread is answered,,

5. Thanx.

6. Originally Posted by asjdsm
goot the specs of super star 70cc from their website,, its bore and stroke are as follows

Bore * Stroke 47 mm * 49.5 mm .... making it 85cc bike..
Super Star Motorcycles
How can u say that it is 85cc? Means how u calculated it?

7. using equation ,, i pointed in the thread

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