Boil­ing rad

Frus­tra­tion over hot and both­ered ra­di­a­tor

BIKE (UK) - - LIFE - Mark Wil­liams Found­ing editor

OUT FOR A RE­CENT HOT Sun­day jaunt with a cou­ple of pals – both as it turned out wisely rid­ing air-cooled ma­chin­ery – the K75 boiled its rad while caught in stop-start traf­fic in a touristy town. Af­ter cool­ing off and ap­ply­ing much ex­pen­sive bot­tled wa­ter, I nursed it back home and be­gan a long, te­dious in­ves­ti­ga­tion of the cool­ing sys­tem, start­ing with knuck­le­scrap­ing de­tach­ment of body­work blighted by cor­roded steel fix­ings in al­loy cast­ings. Do­ing it by the work­shop man­ual meant firstly test­ing the rad pres­sure cap, which was OK, then the seal on the ther­mo­stat valve (OK), then dan­gling that in a pan of boiled wa­ter to check that it opened and closed (OK), then de­tach­ing, clean­ing and check­ing the badly cor­roded-in tem­per­a­ture sender switch to the fan (OK). Hav­ing re­moved the ra­di­a­tor be­fore any of the above men­tioned I could’ve sim­ply tested the fan which even­tu­ally proved to be seized af­ter many years in stor­age (pre­vi­ous owner). So time for a war­ranted used one from BMW spares he­roes Moto-works (mo­tor­works.co.uk) and at £75, half the cost of a new item. The moral of the tale be­ing not to al­ways do things by the book, es­pe­cially one writ­ten by Mr Haynes.

The cul­prit: seized fan mo­tor

Pres­sure ller cap: ok

Rad ther­mo­stat tested

Been rid­ing for: 54 years Owns: Honda VT500 As­cot Tracker, BMW K75S, (CB400N Tracker al­most sold)

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