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esncncncc .ind thc paru.”
whitc Broi." firsl step »a> (o in-creasc ihe engine'» si/.c W 601 cc. The stock cylinder deese was pressed uul. then thc cylinder was cnlarecd to ae-*.ept a itcw sieci liitcr. Kxcd to 101 mm (stock horę «s 92mm) A 10.5:1 Wiscco 1'orgcd pision. a W81650 all-around-usc cantshafi. and heacier vakc and cluteh spring complcted thc intcrnal engmc modifications
NcxL a 41 mm tapered-bore. flat-slidc Mikum carburetor was in-
sullcd. and ihe airbos Mas ntodilied to incrcase airflow W hitc Bros. also rermwed thc smog caniitcr and thc iinsiglnly cylindcr-moonted airpump (tltis may make lite bikc illcgal for rond uk in sonie States), and ihe li-nal-drise gc.tr rntk» was changed hv rcplncing thc standard 15-tooth countcnhafl sprockct witlt a 14-tooth unit Finally. thc nasal-sound-ingstandard eshaust system wasash-cnnncd in fasor oi a diromcd Supcrtcapp unit
Thcse modifleations transformed
The Suportrapp exhaust pipę sounds much bet ter then stock, though the noise level mey be a shade too stirring for some. Riders in buitl-up areas witt want to short-Shift or tako a lew eshaust tfises out of the system to keep the noise lovel soclatty acceptabte. Metseler tire s and Progressive Susponsion Shocks improve handting.
thc slcepy. stock engine mto one tlui‘s powcrful. respon»ivc anJ fun A quick shift from firsl to second gear will loft the bikc*? front tire. acceleration i- brisk. and roll-on limes are rcduced drama1 ically, ope-cially in thc 60-to-80*mph rangę, w herc the GB60I is quickcr tłun most 750cc inlinc-Four. The GB‘s top speed jumped from 107 to 117 mile* per liour. too. despitc the lowcr finał gear rano of thc Wliitc Bros. bikc With a stock front sprockct. the knled GB woild likele nuduc 125 miles an hour. though at lic espense ofslighity less rippy acccleraliun -\s it i*. thc WhilC Bros. CIF s-arburaics wuhoiit hesitatiun. rcqui .*s a lot less sliifiing than the tlitd r and ils heallhier lorquc out nul pnoides a nieć burst ofpower. allos ng thc 601 to .ucclcratc from tum A turn willi fersor instead of thc J.renwe ot thc slocker.
“We could easily make it es en faster.** I kin Whitc bcamed w hen told of thc 60l's dramatically im-nr.ncd performance limes. “We nave a hotter camshaft. and we could flow thc head But thal might cum-p mm i se thc GB's in-town riuahility ”
With thc enemę mak mg morę power and proilticing morc grrns. Whitc Bios. dipped farther inio ils cataloc to upgiade thc GB‘s suspen-sion I hc company carrics various lincs of shocks and spring*. and littcd the Honda with Progrcssise Suspcn-sion componcnts thal better m.nch thc modincd GB s newfound horw-posser A finał chassts complcmeni was the installation of Mei/.eler tires. an ME3) Laser up front and an Ml: 55 Metronie on thc rcar
\k iih ils improscd cne mc. suspen-sion and tiies. thc Whitc Bros GB601 is u rcminder of svb»t in-formcsl liJers of thc I95IK alrcady knew how cnjoyahlc a lightwcighi. nimbie*1 uindling. powcrful Single can bc Tltis is one fun hikc.
Iransforming the walił lower GB500 into an outstanJing motorcy-clc isn‘t a chejp operttlion. Whal it y ields. though. is unujuc. a molorcy-clc thal pays homage to the classic British Singlcs, yet has Ihc best of Japancse tcchnology and a hcalthy doscóf American hot-rodding kitów-how If you‘rc a truć fan of thc Thumpcr, thal"* an almosl-itrcMst-ihle combination. Q