Classic Trial - - CONTENTS - Ar­ti­cle: Steven Crane

Boyesen Reed Valve

The early seven­ties would see the in­tro­duc­tion of the reed valve in­duc­tion sys­tem to the two-stroke tri­als ma­chines. They were de­vel­oped by an Amer­i­can com­pany named Boyesen. Eyvind Boyesen was the Pres­i­dent and founder of Boyesen, which started a per­for­mance revo­lu­tion in 1972 on a shoe­string budget and with a sin­gle patent in hand. He used reed in­duc­tion tech­nol­ogy in com­bi­na­tion with his patented dual-stage reed to pro­duce in­stantly stun­ning re­sults. Mo­tor­cy­cles us­ing Boyesen reeds were con­sis­tently out­per­form­ing other ma­chines us­ing other modes of in­take in­duc­tion. On tri­als and in com­pe­ti­tion the Boyesen name be­came

equated with su­pe­rior per­for­mance, qual­ity and ser­vice.

Since its in­cep­tion it has set the stan­dard by which all other high per­for­mance com­po­nents and in­take sys­tems are judged. For more than thirty years Boyesen has spe­cialised in the de­sign and man­u­fac­ture of high per­for­mance parts to the power sports in­dus­try.

The con­fi­dence shown by the man­u­fac­turer’s re­search and de­vel­op­ment part­ner­ships bleeds all the way down to weekend rid­ers look­ing for that ex­tra per­for­mance in the com­pet­i­tive world we live in. Reed valves are used ex­ten­sively on two-stroke en­gines and ben­e­fit per­for­mance im­mensely, and es­pe­cially when ap­plied to the tri­als mo­tor­cy­cle.

Con­sist­ing of a flat, thin metal or com­pos­ite ma­te­rial the reed valve on a mo­tor­cy­cle is de­signed to al­low the fuel mix­ture to flow in one di­rec­tion only dur­ing the inlet phase.

One of the lim­it­ing fac­tors on two-stroke per­for­mance is that the in­duc­tion phase is di­rectly re­lated to the pis­ton move­ment, and there­fore is limited in its du­ra­tion.

En­gines fit­ted with reed valves re­strict the mix­ture from be­ing ejected back through the inlet port as the pis­ton de­scends (dur­ing pri­mary com­pres­sion). Al­though reed valves re­strict the flow of in­com­ing mix­ture their de­sign al­lows for a greater to­tal amount to be re­tained in the crank­case and in turn in­creases per­for­mance.


From those early days the ap­pli­ca­tions for Boyesen tech­nol­ogy have ex­panded to in­clude in­take prod­ucts for wa­ter­craft, snow­mo­biles and out­board ma­rine en­gines. Man­u­fac­tur­ing has been — and continues to be — per­fected with painstak­ing pre­ci­sion and care, en­sur­ing the high­est qual­ity stan­dards for the ul­ti­mate in trou­ble free per­for­mance. Through li­cens­ing agree­ments around the globe, tech­nol­ogy de­signed and patented by Boyesen is built into twostroke en­gines.

More than two decades and many patents later mo­tor­cy­cle rid­ers and mo­tor­sport en­thu­si­asts around the world have turned Boyesen En­gi­neer­ing into a com­pany serv­ing people on six con­ti­nents. Be­cause of his dual-stage reed in­no­va­tion Eyvind Boyesen be­came known as the ‘reed man’ through­out the in­dus­try. Never con­tent with ‘good enough’, this Nor­we­gian-born in­ven­tor has been ob­sessed with the de­sire for con­tin­ual im­prove­ment.

Man­made in­ven­tions such as the in­ter­nal com­bus­tion en­gine could never be said to ‘have ar­rived’ at per­fec­tion. The rea­son is that hu­man in­no­va­tion is never static but is al­ways ca­pa­ble of achiev­ing new in­sights and a bet­ter un­der­stand­ing of the dy­namic forces of en­ergy and mat­ter. This ex­plains the mo­ti­vat­ing prin­ci­ple be­hind the com­pany: to bring cre­ative en­gi­neer­ing so­lu­tions into the mar­ket­place. But Eyvind Boyesen is not fin­ished yet.

There are a num­ber of plans on his draw­ing board — pro­to­typed, tested and ready for the right mo­ment to en­ter the mar­ket­place.

Boyesen En­gi­neer­ing is presently com­mit­ted to the on­go­ing de­vel­op­ment of in­no­va­tive per­for­mance prod­ucts for the power sports in­dus­try, reed in­duc­tion sys­tems for two-stroke en­gines, con­sult­ing and re­search ser­vices re­lated to two-stroke en­gine de­sign and the de­vel­op­ment of tech­nolo­gies and new prod­uct lines that will en­hance per­for­mance in the small en­gine and recre­ational mar­ket­place.

This shows the Reed Valve block in po­si­tion

The man who started the revo­lu­tion – Eyvind BoyesenThe Boyesen Reed Sys­temIn this view you can clearly see the ap­pli­ca­tion when fit­ted to the two-stroke mo­tor

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