CALCULATORS
Connecting Rod (Big End) Bearing Selector
Selects replacement big end bearings for connecting rods P1–P3.
connecting rod number - crankshaft web number| Rod | Rod No. (on rod) | Crank Web No. (on web) | Result |
|---|
Where do I find these numbers?
The number “B” is stamped on each connecting rod (e.g. the “6” in a “6 C” marking). The number “A” for each rod journal is stamped on the crankshaft web (marked P1, P2, P3). Subtract: rod number - web number gives the bearing size/color. Example from the manual: rod 6 - web 4 = 2 (Black).
Crankshaft Journal (Main) Bearing Selector
Selects replacement crankshaft journal bearings for J1–J4.
crankcase number - crankshaft web number + 2| Journal | Crankcase No. (lower case) | Crank Web No. (on web) | Result |
|---|
Where do I find these numbers?
The number “B” for each journal is stamped into the lower crankcase (marked J4 J3 J2 J1). The number “A” is stamped on the crankshaft web (marked J1–J4). Formula: crankcase - web + 2 gives the size/color. Example from the manual: crankcase 6 - web 4 + 2 = 4 (Green).
Valve Shim / Pad Calculator
Finds the replacement pad thickness from your measured clearance and the pad currently installed. Pick a YXZ1000R preset, or choose Custom target to use it on any engine. Units are adjustable and default to mm.
How this is calculated
For a preset, the target clearance is the middle of the spec range; for a custom target it's the value you enter. New pad = current pad + (measured - target), then rounded to the nearest available pad size (). A thicker pad reduces clearance; a thinner pad increases it. The exact ideal pad is always shown too, so you can match whatever pad increments your engine uses. Always re-measure after installing.
Dual-Rate Coilover Spring Calculator
Enter your two springs and setup and see the full force curve. Drag the crossover to watch the rate transition move live. Units are imperial (lb, in, lb/in).
Figure out motion ratio
Which method should I use?
Quick span gives you one motion ratio from a single measurement centered on ride height. It's fast and it's the number that matters most for spring rate and ride frequency, because that's where the machine sits and spends most of its time. Use this for tuning the ride.
Multi-point has you measure at several positions across the whole stroke. It still applies the ride-height ratio to the calc, but it also shows how the ratio changes from droop to full compression — which tells you whether the suspension is rising-rate (firms up as it compresses, usually what you want) or falling-rate (goes soft deep in travel, watch for bottoming). Use this when you want to understand the suspension's character, not just the ride number.
Calculate rate from dimensions
Calculate rate from dimensions
What this calculates & how
Combined (low) rate = two springs in series, k? = (k1·k2)/(k1+k2), active until the crossover collar engages. High rate = the main spring alone after crossover. Crossover point = crossover force ÷ combined rate. Ride/sag = where corner weight sits on the curve. Ride frequency = (1/2p)·v(wheel-rate·g / weight), using wheel rate = spring rate × motion ratio². Coil bind uses solid height = wire dia × total coils. Verify against your shock's actual measured stack before building.
