Drag race T135 version

[P@simuno]

wow!! nice this is mine in the making at least. 200cc for unified drag rules limited displacmentView attachment 13946 View attachment 13945
View attachment 13947
View attachment 13948

Nice bike! in my drag bike, i have 2 problem need to resolve sprocket combination for 400meters and the water pump system.

@ docgabby can you give me idea what sprocket combination are good for my bike.

the specs is:

X1R 65mm borekit
pin 4
bighead valve
30mm carb
45/90 rear and front wheel

i already try the 14/36 and 15/42 sprocket and the result is not enough for 400meters due to all gear are used and got the peak point and still looking for another shift to finish the 400meters

 

[docgabby]

wow your bike definitely aint 200cc! 65mm bore pin 4 (58.7 plus 8mm equals 66.7mm) that gives you a displacement of 221.47cc! noticed you didnt use any base plate? must be short conrod from mio with bushing to accommodate piston pin 14mm. your rear tire is too narrow is suggest a 60/80 irc eat my dust or gekko satan for better grip and rear stability. may i know what transmission you use or the gear ratio from gear 1 to gear 4? definitely stock wont do in drag mode.

 

[docgabby]

the 14/36 sprocket gives you 2.57 while the 15/42 gives you 2.8 so they are far from each other

15/38 2.53
13/33 2.54
16/41 2.56
14/36 2.57
17/44 2.59
15/39 2.6
13/34 2.62
16/42 2.63
14/37 2.64
17/45 2.65

15/40 2.67
13/35 2.69
16/43 2.69
17/46 2.71
14/38 2.71
15/41 2.73
16/44 2.75
17/47 2.76
13/36 2.77
14/39 2.79
15/42 2.8
16/45 2.81
17/48 2.82
13/37 2.85
14/40 2.86
15/43 2.87
16/46 2.88
17/49 2.88
13/38 2.92
14/41 2.93
15/44 2.93
13/39 3
14/42 3
15/45 3
16/48 3

 

[docgabby]

14/28 2
15/30 2
16/32 2
17/34 2
16/33 2.06
17/35 2.06
14/29 2.07
15/31 2.07
13/27 2.08
17/36 2.12
16/34 2.13
15/32 2.13
14/30 2.14
13/28 2.15
17/37 2.18
16/35 2.19
15/33 2.2
14/31 2.21
13/29 2.23
17/38 2.24
16/36 2.25
15/34 2.27
17/39 2.29
14/32 2.29
16/37 2.31

 

[docgabby]

13/30 2.31
15/35 2.33
17/40 2.35
14/33 2.36
13/31 2.38
16/38 2.38
15/36 2.4
17/41 2.41
16/39 2.44
13/32 2.46
15/37 2.47
17/42 2.47
14/35 2.5
16/40 2.5
17/43 2.53
15/38 2.53

 

[docgabby]

the only problem with sniper is we cant go 16T or bigger engine sprocket. it wont fit. they say you can use a 16t engine sprocket if you use a 415 chain. the sprocket combinations in red are the ones we can only use. a lower ratio gives you more top speed at the expense of acceleration because it lengthens the gap per gear. the higher ratio is the opposite.

 

[P@simuno]

wow your bike definitely aint 200cc! 65mm bore pin 4 (58.7 plus 8mm equals 66.7mm) that gives you a displacement of 221.47cc! noticed you didnt use any base plate? must be short conrod from mio with bushing to accommodate piston pin 14mm. your rear tire is too narrow is suggest a 60/80 irc eat my dust or gekko satan for better grip and rear stability. may i know what transmission you use or the gear ratio from gear 1 to gear 4? definitely stock wont do in drag mode.

i'm using faito tranny set

 

[P@simuno]

the only problem with sniper is we cant go 16T or bigger engine sprocket. it wont fit. they say you can use a 16t engine sprocket if you use a 415 chain. the sprocket combinations in red are the ones we can only use. a lower ratio gives you more top speed at the expense of acceleration because it lengthens the gap per gear. the higher ratio is the opposite.

one thing that i notice during our sprocket test when we use the 14/36 the time we got is 10.5 sec.
while when we use the 15/42 sprocket we got the 8 sec. flat, the question is how come that the high acceleration sprocket gives the best result than the top speed(combination in red) sprocket?

 

[vanjo03]

the only problem with sniper is we cant go 16T or bigger engine sprocket. it wont fit. they say you can use a 16t engine sprocket if you use a 415 chain. the sprocket combinations in red are the ones we can only use. a lower ratio gives you more top speed at the expense of acceleration because it lengthens the gap per gear. the higher ratio is the opposite.

doc pa advice my bike has a mod of

cmr 61mm
28 oko flatslide carb
cams
rcdi
mamban pipe
nipis tires on mags
stock sprocket


acceleration mas great but its so hard to reach the topspeed im also planning to lighten the flywheel but i dont know ho to lighten it any advice doc?

 

[docgabby]

i'm using faito tranny set

are you using all the gears of the faito tranny? gear 1- 13/32, gear 2-17/29, gear 3-22/17, gear 4- 22/21?

 

[docgabby]

one thing that i notice during our sprocket test when we use the 14/36 the time we got is 10.5 sec.
while when we use the 15/42 sprocket we got the 8 sec. flat, the question is how come that the high acceleration sprocket gives the best result than the top speed(combination in red) sprocket?

wow if your times are like that youd beat my friends open raider 85mm bore plus 8mm offset crank full close ratio transmission, aluminum alloy chassis!

 

[P@simuno]

are you using all the gears of the faito tranny? gear 1- 13/32, gear 2-17/29, gear 3-22/17, gear 4- 22/21?

yes all gear are used but not enough to reach the 400meters thats why i need to test lots of sprocket sizes to make it perfect

also i looking for the side of cdi that we used, i think the brt dual band with 20,000 rpm did not enough, what do you think?

 

[docgabby]

yes all gear are used but not enough to reach the 400meters thats why i need to test lots of sprocket sizes to make it perfect

also i looking for the side of cdi that we used, i think the brt dual band with 20,000 rpm did not enough, what do you think?

you are using the wrong transmission combination! for drag i dont recommend the full tranny, only parts of it. i prefer the lhk ratio and use only parts of it. i use half of the lhk full tranny for my daily driver (wide ratio) and the other half for my drag bike (close ratio). two ratios in one tranny set. nothing wrong with your cdi so dont touch dat. shaving magneto i dont do that, some would. id rather have my crankshaft dynamically balanced to regain that lost rpm on top. the bigger piston is additional reciprocating weight thats why rpm drops. you have lots of torque due to bigger displacement but your stock crankshaft is spinning a heavier weight. placing "palaman" for added inertia which you need to spin the heavier piston.

 

[P@simuno]

you have the point bro, now i think the problem is is the flywheel and the magneto reduction, i think i need to bring it back to stock so the torque will decrease. thanks for the info i think this is the answer to my problem.

 

[P@simuno]

you are using the wrong transmission combination! for drag i dont recommend the full tranny, only parts of it. i prefer the lhk ratio and use only parts of it. i use half of the lhk full tranny for my daily driver (wide ratio) and the other half for my drag bike (close ratio). two ratios in one tranny set. nothing wrong with your cdi so dont touch dat. shaving magneto i dont do that, some would. id rather have my crankshaft dynamically balanced to regain that lost rpm on top. the bigger piston is additional reciprocating weight thats why rpm drops. you have lots of torque due to bigger displacement but your stock crankshaft is spinning a heavier weight. placing "palaman" for added inertia which you need to spin the heavier piston.

placing "palaman" where?

 

[docgabby]

placing "palaman" where?

make your crankshaft heavier to increase inertia needed for the heavier piston. see pictures, (my stock crankshaft with stock stroke made bigger and heavier for more inertia to handle the bigger/ heavier piston). for drag transmission i recommend a gear 1-13/31, gear 2-stock (16/30), gear 3- stock (17/23), gear 4- stock (23)/ 20.

 

[docgabby]

doc pa advice my bike has a mod of

cmr 61mm
28 oko flatslide carb
cams
rcdi
mamban pipe
nipis tires on mags
stock sprocket


acceleration mas great but its so hard to reach the topspeed im also planning to lighten the flywheel but i dont know ho to lighten it any advice doc?

change your transmission. have your crankshaft counterweighed or dynamically balanced for the 61mm bore.

 

[vanjo03]

change your transmission. have your crankshaft counterweighed or dynamically balanced for the 61mm bore.

doc wat do u mean by counterweighed??in much simple terms plss thx for the advice

 

[aizarn20]

pwd bang pahiram doc.he.he

 

[docgabby]

pwd bang pahiram doc.he.he

in english bro..hehehehehe