FAQs

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Bottom End Clearances

CrankshaftWidth (Nominal): 74.95mm (2.950") to 75.05mm (2.954") Runout: Max 0.05mm (0.002") End Play: 0.1mm (0.004") to 0.4mm (0.0157")Connecting RodRadial Play: Max 0.05mm (0.002") Axial Play: 0.60mm (0.0236") to 0.93mm (0.0356") Axial Wear Limit: Max 1.4mm (0.0551")Small End ID: 22.02mm (0.8669") to 22.04mm (0.8677") Piston Pin OD: 22mm (0.8661) +0.0mm (0.00") / -0.004mm (0.0015") Clearance: 0.02mm [...]

2017-09-21T13:37:56+00:00 August 23rd, 2017|

Ignition Resistances

PartWire ColerResistanceTrigger Coil  High SpeedBlack -> Pink12-20 ΩLow SpeedBlack -> Blue120-180 Ω   Stator  Low Speed Charging CoilBlack -> Brown230-350 ΩHigh Speed Charging CoilBrown -> Red4-6 ΩLighting CoilsWhite -> Orange0.6-0.9 Ω White -> Green0.54-0.8 Ω Green -> Orange0.8-1.6 Ω   Ignition Coil  Primary WindingCore -> Orange0.95-1.1 ΩSecondary WindingHigh Tension Wire -> Black11-12k Ω

2017-06-29T13:37:29+00:00 June 29th, 2017|

Wood-Rotax Displacements

DisplacementBoreStroke449.3cc9760.8449.4cc9563.4449.7cc9464.8442.3cc9168349.5cc79.570.4447.9cc9070.4447.9cc9070.4504.3cc95.570.4520.2cc9770.4531.0cc9870.4541.9cc9970.4575.3cc10270.4449.8cc9070.7449.8cc8972.3449.9cc88.9572.4449.6cc8677.4481.5cc8977.4537.1cc9477.4572.0cc9777.4595.8cc9977.4607.9cc10077.4632.5cc10277.4646.2cc103.177.4494.0cc8979.4551.0cc9479.4586.8cc9779.4611.2cc9979.4623.6cc10079.4632.5cc10279.4648.8cc103.179.4503.9cc8981562.1cc9481598.6cc9781623.5cc9981636.2cc10081661.9cc10281676.2cc103.181620.7cc9784646.6cc9984686.4cc10284701.3cc103.184

2018-03-01T10:19:12+00:00 April 24th, 2017|

Wood-Rotax Jetting TM42-48

Suggested jetting for the TM42-48 carburetors on the Wood-Rotax TM42 TM45 TM48 Main Jet N100.604-142.5 N100.604-150 N100.604-155 Pilot Jet VM28/486-42.5 VM28/486-40 VM28/486-47.5 Needle J8-8DDY01-97 J8-8CFY02-97 J8-8CFY15-97 Needle Jet 784-430000-Y-6 784-430000-Y-6 784-430000-Y-6 Needle & Seat 786-27001-4.2 786-27001-4.2 786-27002-1A-4.5

2017-04-26T08:14:30+00:00 March 28th, 2017|

Cam Specs

With any of the engines, the cam bolt and lock washer should be replaced frequently. Be sure to use a liberal amount of blue Loctite on the cam bolt and torque to the specifications in the manual. Timing checked at 0.040 in. (1 mm) lift, 0.00 clearance Running clearance 0.004 in. (0.1 mm) Cam [...]

2017-11-14T09:49:52+00:00 March 27th, 2017|

Piston Clearances

We measure our clearances from the bottom of the skirt. What we have found works best is to find different pieces of paper in varying thickness, measure with a micrometer and write the thickness on the paper. If the piston falls through it’s got more clearance. If it stops in the bore it’s about [...]

2017-09-22T17:57:10+00:00 March 19th, 2017|