Njinga inganenedwe kuti ndi "injini", ndipo kukonza n'kofunika kuti injini iyi igwiritse ntchito mphamvu zake zonse. Izi ndi zoona kwambiri pa njinga zamapiri. Njinga zamapiri sizili ngati njinga zamisewu zomwe zimakwera m'misewu ya phula m'misewu yamzinda. Zili m'misewu yosiyanasiyana, m'matope, m'miyala, m'mchenga, komanso m'nkhalango ya Gobi! Chifukwa chake, kukonza ndi kukonza njinga zamapiri tsiku ndi tsiku ndikofunikira kwambiri.
1. Kuyeretsa
Pamene njinga yadzaza ndi matope ndi mchenga ndipo mapaipi aipitsidwa, zomwe zimakhudza kagwiritsidwe ntchito kabwinobwino, njingayo iyenera kutsukidwa. Dziwani kuti pali zida zambiri zoyendetsera njinga, ndipo zida izi ndizoletsedwa kumizidwa m'madzi, choncho poyeretsa, musagwiritse ntchito madzi othamanga kwambiri, ndipo samalani kwambiri pamene pali ma bearing.

Gawo 1Choyamba, tsukani chimango cha thupi ndi madzi, makamaka kuti muyeretse pamwamba pa chimangocho. Tsukani mchenga ndi fumbi zomwe zili m'mipata ya chimangocho.

Gawo 2Tsukani foloko: Tsukani chubu chakunja cha foloko ndikutsuka dothi ndi fumbi pa chubu choyendera cha foloko.

Gawo 3Tsukani crankset ndi dera lakutsogolo, ndikupukuta ndi thaulo. Mutha kutsuka crankset ndi burashi.

Gawo 4Tsukani ma disc, thirani "chotsukira" ma disc, kenako pukutani mafuta ndi fumbi pa ma disc.

Gawo 5Tsukani unyolo, pukutani unyolo ndi burashi yoviika mu "chotsukira" kuti muchotse mafuta ndi fumbi mu unyolo, muumitse unyolo, ndikuchotsanso mafuta ochulukirapo.

Gawo 6Tsukani chiwongolero cha flywheel, chotsani zinyalala (miyala) zomwe zakodwa pakati pa zidutswa za chiwongolero cha flywheel, ndipo tsukani chiwongolero cha flywheel ndi burashi kuti muumitse chiwongolero cha flywheel ndi mafuta ochulukirapo.

Gawo 7Tsukani dera lakumbuyo ndi gudumu lotsogolera, chotsani zinyalala zomwe zakodwa pa gudumu lotsogolera, ndipo thirani mankhwala oyeretsera kuti muchotse mafuta.

Gawo 8Tsukani chubu cha chingwe, tsukani mafuta omwe ali pa chingwe chotumizira magetsi pamalo olumikizira chubu cha chingwe.

Gawo 9Tsukani mawilo (tayala ndi mkombero), thirani mankhwala oyeretsera kuti mutsuke tayala ndi mkombero, ndikupukuta madontho a mafuta ndi madzi omwe ali pa mkombero.

2. Kukonza

Gawo 1Konzani utoto wokanda pa chimango.

Gawo 2Ikani kirimu wokonzera ndi sera wopukuta pa galimoto kuti mtundu woyambirira wa chimango ukhalebe wabwino.

（Dziwani: popera sera yopukutira mofanana, ndi kupukuta mofanana.）

Gawo 3Pakani mafuta pa "kona" ya chogwirira cha brake kuti chogwiriracho chikhale chosinthasintha.

Gawo 4Pakani mafuta pa "kona" yakutsogolo ya derailleur kuti mafuta azikhala osalala.

Gawo 5Pakani mafuta unyolo kuti maunyolo a unyolo azikhala ofewa.

Gawo 6Pakani mafuta ku pulley yakumbuyo ya derailleur kuti pulleyyo ikhalebe ndi mafuta okwanira.

Gawo 7Pakani mafuta pamalo olumikizira chitoliro cha mzere, pakani mafutawo ndi thaulo, kenako pindani chogwirira mabuleki, kuti mzerewo ukhoze kukoka mafuta ena mu chitoliro cha mzere.