The jetting charts below are for my 1999 engine with the airbox lid lifted 25 mm at the front, no air filter and the needles lifted 1 notch. (I run the filter if it is dusty or wet to protect the engine - jet down one size). There is a heat shield between the engine and tank and a cold air feed into the area underneath the tank and above the heat shield which feeds into the airbox. Standard exhausts TZ silencers. Use a weather centre to measure Humidity (%), Air pressure (mB) and Temperature °C - keep a record of weather, jetting and a note of how the bike performs.
Warning : Your bike may need different jetting.
Check your plugs (I use NGK B10EV) they should be a digestive brown (though you can never find two people that agree on the correct colour) My exhausts run dry and have a slate grey deposit on the end of the silencer. Piston tops are digestive brown going onto a pale grey.
General rule is approximately as follows.
| +20mB | Up on size |
| +5° C | Down one size |
| +10% | Down one size |
I have a new chart for the latest spec engine which uses Kehin jets (this chart was for RD jets which flow differently)
| 0960mB | 8° | 13° | 18° | 23° | 28° | 33° | 0980mB | 8° | 13° | 18° | 23° | 28° | 33° | |
| 35% | 155.0 | 152.5 | 150.0 | 147.5 | 145.0 | 142.5 | 35% | 157.5 | 155.0 | 152.5 | 150.0 | 147.5 | 145.0 | |
| 45% | 152.5 | 150.0 | 147.5 | 145.0 | 142.5 | 140.0 | 45% | 155 | 152.5 | 150.0 | 147.5 | 145 | 142.5 | |
| 55% | 150.0 | 147.5 | 145.0 | 142.5 | 140.0 | 137.5 | 55% | 152.5 | 150 | 147.5 | 145 | 142.5 | 140 | |
| 65% | 147.5 | 145.0 | 142.5 | 140.0 | 137.5 | 135.0 | 65% | 150 | 147.5 | 145.0 | 142.5 | 140 | 137.5 | |
| 75% | 145.0 | 142.5 | 140.0 | 137.5 | 135.0 | 132.5 | 75% | 147.5 | 145 | 142.5 | 140 | 137.5 | 135 | |
| 85% | 142.5 | 140.0 | 137.5 | 135.0 | 132.5 | 130.0 | 85% | 145 | 142.5 | 140 | 137.5 | 135 | 132.5 |
| 1000mB | 8° | 13° | 18° | 23° | 28° | 33° | 1020mB | 8° | 13° | 18° | 23° | 28° | 33° | |
| 35% | 160.0 | 157.5 | 155.0 | 152.5 | 150.0 | 147.5 | 35% | 162.5 | 160.0 | 157.5 | 155.0 | 152.5 | 150.0 | |
| 45% | 157.5 | 155.0 | 152.5 | 150.0 | 147.5 | 145.0 | 45% | 160.0 | 157.5 | 155.0 | 152.5 | 150.0 | 147.5 | |
| 55% | 155.0 | 152.5 | 150.0 | 147.5 | 145.0 | 142.5 | 55% | 157.5 | 155.0 | 152.5 | 150.0 | 147.5 | 145.0 | |
| 65% | 152.5 | 150.0 | 147.5 | 145.0 | 142.5 | 140.0 | 65% | 155.0 | 152.5 | 150.0 | 147.5 | 145.0 | 142.5 | |
| 75% | 150.0 | 147.5 | 145.0 | 142.5 | 140.0 | 137.5 | 75% | 152.5 | 150.0 | 147.5 | 145.0 | 142.5 | 140.0 | |
| 85% | 147.5 | 145 | 142.5 | 140 | 137.5 | 135 | 85% | 150.0 | 147.5 | 145.0 | 142.5 | 140.0 | 137.5 |
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This document maintained by
mark@teamsparrow.fsnet.co.uk.
Material Copyright © 2001 Mark Jordan