Megacycle Cams
Megacycle still manufactures a variety of cams for the 750 SOHC/4 engine:
These are only avaliable hardwelded on customer core in exchange for a stock core. Megacycle ran out of billets.
I have used the 125-25 in a 895cc and 915cc engine, and was very pleased with the performance boost. Good increase in mid and top range power, with a low end comparable to a stock engine and displacement. I also have a 836cc engine with a 125-65.
Durat In o/c Run-
Billet Valve ion Lobe Ex o/c ning
Cam # Lift @.04" center btc/abc clrnc
inches degr degr Description and Application bbc/atc inches
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125-05 .340 246 104 OK w/stock piston & springs Best 19/47 .004
(125-00).330 247 104.5 w/HD springs. All around power 48/19 .004
125-01 regrind increase w/smooth power band.
This was originally a production
road race profile
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125-25 .338 268 105 Use high CR pistons & P.M. or R/D 29/69 .005
(125-20).337 283 111.5 springs. Mid-range and top-end 73/30 .005
power, yet retains good low-end
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125-35 .407 266 105 Especially for '78 F2 models. 28/58 .005
(125-30).407 268 106 Great mid-range and top-end. Must 60/28 .005
use modified pistons and springs
Check carefully in CB K models
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125-65 .375 257 103.5 Best all around cam for street and 25/52 .004
(125-60).354 253 103.5 road w/K-836 kit and R/D or P.M. 50/23 .004
springs. Strong mid-range great
top end. Lobe clearancing needed
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125-75 .400 262 105 High performance street/road w/big 26/56 .005
(125-70).375 257 104.5 bore kit. Use racing pistons & 53/24 .005
springs. Mini sprint 3/8 and 1/4
mile. More top-end power than our
#125-65. Lobe clearancing needed
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125-95 .384 285 105.5 Drag race profile. Must use 37/68 .005
(125-90).384 284 105 racing pistons & springs. 12:1 or 67/37 .005
more compression needed. Not for
street use. High R.P.M. cam
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125-x12 .430 270 105 Race profile. Great throttle ctrl 30/60 .005
.445 273 106.5 Maintain high cylinder pressure w/ 63/30 .007
this cam. Racing pistons and
springs required. 12:1 or more.
850cc and larger
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125-D .345 265 105.5 Kenny Harman "D" grind. OK w/ 26/59 .005
billet .325 280 110 stock pistons. Use HD springs. 70/30 .005
Mid-range and some top-end
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125-F .385 270 107 Kenny Harman "F" grind. Use 28/62 .005
billet .330 278 110 racing pistons & springs. Mini 69/29 .005
sprint, mid range and top-end
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125-NR .350 252 106 NORRIS R profile. MILD performance20/52 .005
.350 252 106 increase. Road/Road race. SOME TQ52/20 .005
ENGINE BUILDERS PREFER this profile
for small tracks in basically stock
motors. P.M. Springs STRONGLY
RECOMMENDED
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125-N-T3.342 215 109.5 Turbo profile Norris design 2/37 .004
.312 222 110 Turbo charged engines. Use race 41/1 .006
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Stock .315 220 K7, F2 stock cams are different
K/F .313 235
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#125-01 is the most economical replacement cam for use in stock or mild motors.