Great mo­tor, iffy electrics

Practical Sportsbikes (UK) - - Vfr400r -

V4 mo­tor is a very ro­bust de­sign, with added re­li­a­bil­ity from the gear-driven cams. Oil and fil­ter should be changed at least ev­ery 4000 miles (us­ing a good qual­ity, semi-syn­thetic oil); valve clear­ances ev­ery 16,000.The whine from the cam­drive, in­ci­den­tally, is per­fectly nor­mal and part of the NC’S char­ac­ter.

Carbs

Tiny, ex­quis­ite and no­to­ri­ously dif­fi­cult to set up cor­rectly, re­sult­ing in com­mon mid-range flat-spots and the like from worn or badly ad­justed carbs.those in bikes that have been stand­ing for a while also of­ten get clogged up with gunk and will re­quire a full strip and clean.

Der­e­stric­tor

If an im­port it will orig­i­nally have been re­stricted to ad­here to Ja­panese mar­ket reg­u­la­tions – al­though most by now will have been der­e­stricted. Check the ig­ni­tion unit un­der the seat (just ahead of the tail­light). If it has a small black box plugged-in in se­quence, it’s the gizmo (usu­ally an M-max plug-in box) that over­rides the 180kph/112mph speed restric­tion. It’s eas­ier to re­move the peg in the speedo.uk-spec VFR400S do not re­quire der­e­strict­ing.

Reg­u­la­tor/rec­ti­fier

A weak spot on most Hon­das of the pe­riod and even gen­uine re­place­ments rarely last more than five years.to check, use a mul­ti­me­ter across the bat­tery ter­mi­nals with the en­gine at 5000rpm – it should read a steady 14.4 volts. If sig­nif­i­cantly un­der, your best bet is a de­cent af­ter­mar­ket item. Make sure you check the earth too.

Other electrics

All ver­sions of thevfr suf­fer from weak electrics.a bad bat­tery can eas­ily take out your reg­u­la­tor and gen­er­a­tor so check for charg­ing/start­ing prob­lems.the switchgear

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