JIMS Box 3 1208-1353 (all models of 120, 131, or 135 Alpha, Beta and EVO Mount Engines (Including Kits) - Manual (Page 18)

555 Dawson Drive, Camarillo, CA 93012 Phone 805-482-6913 • Fax 805-482-7422
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Rev I
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No.1208-1353
A Division of Thiessen Products, INC
IIn ns st tr ru uc ct tiio on n S Sh he ee et t F Fo or r B Bo ox x 3 3 1 12 20 0” ”,, 1 13 31 1” ”,, o or r 1 13 35 5” ”
E En ng giin ne e A As ss se em mb bl liie es s O Or r E En ng giin ne e R Ra ac ce e K Kiit ts s
The possibilities are almost endless. However, exploring those possibilities can be great fun.
If drag racing and performance tuning in general were "Cut-and-Dried", they would be bor-
ing. The stands would not fill and pits would be empty. There would be no friendly argu-
ments about 'which cam' or 'what exhaust' works best.
Drag racing is one of the most popular participating motor sports in America. The fans are
often racers themselves, have been racers, want to be racers or know a lot about the nuts and
bolts of drag racing.
We at JIMS have spent years developing the JIMS 120, 131, or 135 Race Kit engine for drag
racers and those who want to become drag racers. The 120, 131, or 135 engine is a strong,
ground pounding and reliable base for your exploration into the complex and fascinating
sport of drag racing. We hope you enjoy your new 120, 131, or 135 as much as we are pleased
to bring it to you.
Inspection and Service Wear information for Valve Train Components used in
Performance Twin Cam Engines.
Valve Train Components should be inspected every 5000 miles of service. More often if an en-
gine is used under severe riding condition, i.e. full throttle race operation, in city, dusty, low
octane usage, trailer and two up riding. As with all high performance engines, components
are under or subject to more stress in one-way or another, many times more then a stock
engine. The following engine components will need to be inspected and or replaced each
5000 miles or more often as needed.
1. Rocker arm / Rocker arm ShaftReplace if more than
Shaft fit in bushing .0035
End play, side clearance .025
Shaft fit in support plate .003
2. Cam support plate Replace parts if more than:
Cam chain tensioner shoe wear .090 or 1/2 thickness of shoe
Crankcase bushing press fit
in cam support plate .0008
Crankshaft bushing maximum I.D. .8545
3. Hydraulic Lifter Replace if more than
Fit in crankcase .003
Roller fit on axel .0015 or any rough area or tight spot
Roller end clearance .015
4. Cylinder Head Replace if more than
Valve guide, press fit in head .002
Valve seat, press fit in head .002
Head warpage .006
5. Cylinder, Replace if more than
Taper .002
Out of round .002
Warpage at gasket surfaces .006