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by JMerrell46
Mon Dec 25, 2017 1:18 pm
Forum: Honda Community
Topic: Xr400r jetting
Replies: 6
Views: 2838

Re: Xr400r jetting

Hopefully you got your bike jetted and figured out by now. But in case you haven’t, I just had he same problem with my 99 XR400. Plug was black (indicating too rich), but all other indicators were saying too lean (backfiring/popping, hard to start, rough idle, better on choke, Gordon’s mods complete...