S5 Engine Tuning 

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S5-N Engine Tuning

AS FITTED TO PRE 2001 MALAGUTI, LEM, MOTO ROMA, ITALJET, YOUNG RIDER, BSA, BETA, HM & MANY MORE KIDS FUN BIKES

Click HERE for S5 E/N engine diagram

PHBG 19 or 21

PHBG 21 Racing

Chain & Sprockets

S5 Clutch

Clutch Springs

Dellorto SHA 14/12 carb £50.47

Bigger than the 14/9, gives a 77% increase in carb diameter

Dellorto SHA 15/15 carb £58.69

Bigger than the 14/12, gives a 56% increase in carb diameter

Perfomance manifold £12.34

Allows maximum benefit from the 14/12 & 15/15 SHA carbs

10T or 11T front sprocket £14.69

Allows you to improve top speed or acceleration (check your current sprocket)

4 reed 50cc cylinder conversion £141.00

A big increase in performance over the non-reed cylinder, kit is complete with cylinder, head, piston kit, reed block, manifold & gaskets (needs PHBG carb). Will require modifications to fit (includes trimming cooling fins) on some bikes.

4 reed 70cc cylinder conversion £152.75

a big increase in performance over the non reed and 50cc cylinder, kit is complete with cylinder, head, piston kit, reed block, manifold & gaskets (needs PHBG carb). Will require modifications to fit (includes trimming cooling fins) on some bikes.

PHBG carbs from £70.44 to £88.13

The carbs are multi jet with round slides, a big improvement in size & performance over the SHA (flat slide single jet) carbs. Sizes are 15, 18, 19 & 21mm. Types available to fit rubber & alloy inlet manifold (please specify). Will maximise performance on reed valved cylinder, minor increases on non reed cylinders. Will require a new manifold if replacing an SHA carb.

Performance clutch £44.77

As OE clutch but with stiff performance springs to hold clutch in till higher engine rpm. Gives better racing starts, and matches new power curve of 4 reed cylinder

Performance clutch springs £4.94 per pair

Available in medium & stiff versions, gives you adjustability in the enguage point of the clutch in relation to engine rpm. Gives better racing starts, and matches new power curve of 4 reed cylinder

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Copyright © 2008 Harglo Performance
Last modified: April, 2008