LRP Z.28R Spec.3 Truggy, 32809 User Manual

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Page 1

CARBURETOR

EXHAUST SYSTEM

RUN-IN

FUEL

Z.28R SPEC.3

TRUGGY

MA00 0157

USER GUIDE

HEAD CLEARANCE

LRP electronic GmbH

Wilhelm-Enssl e-S tr. 132-134, 73630 Remsha lden, G ermany

Tel.: int+49-7181-4098 -0, Fa x: int+49 -7181-4098- 30

O@LRP-ELEC TRON IC.DE

WW W.LRP- ELECTRONIC.DE

WARNING NOTES

ORDER N O.:

32809

3.95 H P

38.5 00 RP M

TECHNICAL DATA

AIRFILTER

GLOWPLUG

Engine size

.28 (4.59ccm)

Exhaust

Rear

Bore

Stroke

Liner

ABC

Number of ports

8+1 (8xtransfer-, 1xexhaust-port)

Crankshaft

Crankcase

VTEC.28 Heavy Duty, black coloured

Piston

Fully CNC-machined, high-silicium alloy

Connecting Rod

Fork shaped aluminium using double bushings

Glowplug

LRP Standard style R6 (No. 35060) included

Carburetor

VTEC thermal protected Competition slide carburetor

with venturi inserts (7.5, 8.5 and 9.0mm included)

Power Output*

3.95

Max. RPM*

.500

Weight

450

*Figures may vary de pending on used fuel , muf ﬂ er and tuning.

result coul d be a ﬁ re in the model wh ich cou ld destroy an ything else in the vi cinit y.

carbonium monoxide which can lead to death! Always use your engine ou tdoor s or in well

venti lated areas only.

touch t hem.

carburetor.

ever use regula r gasoline or ai rplane fu el. U se fresh 2-str oke model car f uel only! We recom-

mend using our lin e of LRP high-qualit y fuels

(No. 35710: 25% 1L / No. 35730: 25% 3,5L)

For the

LRP Z.28R Spec.

3 Trug gy

en gine we r ecommend a f uel with 25% nitro. A hig her nitro content

decre ases yo ur engi ne’s lifetime . Ther efore do never exceed 36% nit ro.

A good air ﬁ lter is very important for the l ife of your engine. Never run without an air ﬁ lter, as

quick and permane nt damage will result! Don’t forge t to impregn ate the air ﬁ lter with a suitable

oil before usage. Carefully clean the airﬁ lte r at le ast after ever y tenth tank. Replace the air ﬁ lter

ever y 3 litr es (~1 gallon) of usag e.

We rec ommen d the use of our LRP Hi-Flow 2-stage air ﬁ lter (No. 36560) toge

ther with our L RP

Hi-Flow air ﬁ lter oil (No

. 36590 ).

Use only standard sty le glow- plugs for this engine. We recommend usi ng our line of high-q uality

LRP Plati num / Iridium glowp lugs

(No. 35030 - No. 3506 0

, ava ilabe as R3 to R6). Check them

freq uently and never run with wor n-out or old glow-p lugs since they could damage yo ur engine.

They turn dull when your engine was too lean and should be replaced. T hey should stay bright

like chrome. If t he g lowplugs wear out too fast, an additional 0.1mm shim bet ween burnroom

and liner is recommend ed. Whenever you have trouble with the engine stalling for no reason,

replace the glow-plug ﬁ rst !

TIP: Our LRP raceteam always use s

a LR P Platinum / Iridium R6 (No. 35060) plug for the

LRP Z. 28R Spe c.

Truggy engine. Only when the amb ient te mpera ture is

below 10° C, a

Platinum / Iridium R5 (No. 35050 ) plug

is used .

Dear Cu stomer,

hank you for your trust in this LRP produc t. By purc hasing a LRP nitro engine, you have choosen

a high -per formance and highly sophisticated product, which doesn´t make any compro mise

between ma ximum perf ormance and easy tun e

abili ty. We hope you enjoy your new engine.

Pleas e read the followin g inst ructions

to ensure, that your LRP Z.28R Spec.3 Truggy engine

always works up to your full satisf action.

Pleas e read and under stand these i nstructions comp letely before you use this produc t!

With operating th is product

, you accept the L RP warrant y terms .

Never run without a pipe since this will cause excess ive overheating and may damage your

engine. A good pipe has a very huge effect on the per formance of a 2-st roke eng ine. For th e LRP

Z.28R Spec.

3 Trugg y

e recommend usin g our

LRP

1/8 Off- Road Compe tition exh aust system

(

No. 3620

for maximum p erforman ce.

We reco mmend a real head cl eara nce betwee n pist on and b urnr oom of about 0.75mm (0.029“)

or more, when the piston is at Top Dead Ce nter. The real head cle arance can be calculat ed as

follo ws:

Real head clea

rance = Thickness of head shims

+ 0.65mm (tha

t‘s due to the in

terna l

nstruction of the e ngine a n

d the com pression of t he head s hims, w hen the

cooli ng head

is moun ted)

We sugge st to start with 0.20mm (0.008“) shims underneath the combustion chamber. You

may want to ad just the shims depending on nitro-conte nt (see table) or t rack layout. Large

tracks may requi re an extr a 0.10mm (0.004“) sh im to reach higher tops peed and improved fuel

consumptio n, but this will decre ase acc eleration s lightly.

Nitro conte nt

16%

25%

30%

Real head clea rance

0.75mm / 0.0 29“

0.85mm / 0.033 “

Head sh ims

0.10mm / 0.00 4“

0.20mm / 0.008“

The f actory settings o f the engin e are as fo llowi ng and are a good startin g point for you, if you

are no t satisﬁ ed with your carb uretor set tings. Turn in the needle s comp letely (Ca ution: Do not

over tighten them!) and loosen t hem the required num ber of turns ag ain:

Idle screw (#1) :

Adjus ts the air ﬂ ow when carburetor is fully

close d. Turn CW for highe r idle-speed and

CCW for lowe r idle-speed. Should be ope n 0.5-

Low spe ed need le (#2):

Adjus ts the mid/low -speed ﬂ ow rate of the fuel.

Turn CW for leaner and CCW f or richer set ting.

)

3,75

turns

Main speed needle (#3 ):

Adjus ts the main ﬂ ow rate of the fuel (when the throt tle is op ened

signi ﬁ cantly). Turn CW for leaner and CCW for richer setti ng.

Carbu retor ventu ri inse rts :

In order t

o af fect the fuel/air mixture, you can use d iff erent venturi insert s on this car bure tor.

These are to ﬁ netu ne your engine to differe nt track layouts.

There ar e th ree dif ferent ventur is

coming with the engine: 7.5mm, 8.5mm and 9.0mm.

- 9.0mm has the most

power

, 7.5mm has the best fuel consumpt ion.

roper run-in of the engine is a ver y important step in ensuring th at you get the highest p erfor-

mance an d lifet ime of your en gine.

Take your time for proper run-in.

Do not use run-in benches ,

but use your car for run -in.

Use the same f uel as y ou w ill be using for the life of the engine.

Special run- in fuel is not needed. If your engi ne doesn’t star t eas ily you may tr y loosen the gl ow-

plug by ½-tu rn to decomp ress the engine and try again. Don’t forget to t ighten t he g low-plug

again once the e ngine s tar ted!

Proce dure:

muf ﬂ er.

fect.

Page 2

TROUBLE SHOOTING GUIDETUNING

AFTER RUN

MAINTENANCE

REPAIR PROCEDURES /

LIMITED WARRANTY

All products from LRP electronic (hereinafter called “LRP ”) are manuf actured a ccording t o the

highe st q ualit y standards. LRP guar antees this produc t to be free from defects in materials or

workmanship for 90 days from the original date of purchase veriﬁ ed by sales receipt. This lim ited

warr anty doesn’t cove r defects, which are a re sult of normal wear, misuse or imp roper maint e-

nance. This applies among other th ings on :

Engine disassembl y by customer

•

Any modiﬁ cation of the e ngine d one by the customer

•

Rust inside the engine

Dust or dirt inside the engine

Damag ed engi ne due to g low plug failure

•

Overheating

•

Scratches inside the engine caused by dir t or dus t

•

Water in fuel

Wrong b reak- in proc edure

Damag ed piston due to piston stop de vices

•

Damag ed cylinder ex haus t port due to pis ton stop devices

•

Breakages at high rp m without engine load

To eliminate all other possi bilit ies or improper ha ndlin g, ﬁ rst chec k all other compon ents an d the

trouble shooting guid e before you send in this product for repair or warrant y. Produc ts sent in for

repai r, that operate perfect ha ve to be charged w ith a se rvice fee.

By se nding in t his produc t, you assign LRP to rep air the pr oduct, if it is no warr anty case. The

origi nal sales recei pt including date of purchase n eeds to be included. Othe rwise, no warrant y

can be granted. For quick repair- and re turn ser vice, add your address and d etailed de scription

of the ma lfunction.

Our limited war rant y liability sh all be limi ted t o rep airin g the unit to our original speci ﬁ cations.

In n o case shall our liabilit y exceed the original cost of this unit. Because we don’t have con -

trol over th e installation or use o f t his product, we can‘ t accept any liability for any damages

resulting from using this produc t. By installing or op erat ing this product , t he user accepts all

resulting liability.

The s peciﬁ c ations like weig ht, size and others should be seen as guide values. Due to on going

techn ical improvements, which are don e in the interest of the p roduct, LRP does not take any

responsibility f or the accura cy of these specs.

LRP-Distribu tor-Serv ice:

•

Package your product carefully and include sale s r eceip t a nd detailed description of mal-

function.

Send pa rcel to your national LRP dis trib utor.

•

Distributor repairs or exchanges the produc t.

•

Shipment back to you usua lly by COD (cash on delivery), but this is subject to your nation al

LRP dis trib utor ‘s general policy.

It never hur ts to have the mixture too r ich, but NEVER let the mixtu re get t oo lean. Always tune

from rich to lean. If in doubt , riche n it up ﬁ r st! Never try to tune a cold engine, run 3-5 minutes to

get the engine up to run ning te mper ature before doing any adjustme nts!

Basic t uning procedure is as follows:

2. Start tuning you r engin e with t he set tings too rich.

3. Always tune main- speed needl e (top-end ) ﬁ rst.

4. Tune low speed needle next.

5. Reset idle speed screw.

Proce dure:

2. Go to the track with the main-needle s et too r ich, there should be heav y smoke coming from

the mufﬂ er now.

3. Tune the engine by l eanin g the main-needle 1/ 8 turn at a time (turn clockw ise).

- Your goal w ill be that the e ngine w ill jus t reach maximum RPM on the st raightawa y.

- Open the main-needle again by an 1/8 turn (turn counter-cl ockw ise) whe n you have reac hed

that point. Th is should be the per fect setting for the main-needle (tempe rature of 110-130°C /

230-266°F).

- If the main-ne edle is se t too lean, the engine will overheat and wil l not acce lera te smoothly.

If this happens, immed iately stop the engin e and rich en the mai n-needle (count erclo ck-

wise) 1/4 turn befor e a new at temp t.

4. Adjust the low speed needle now. Run 3 full l aps, stop the car ne ar you and le t it idle for

5secs . „Push off“. It should have slightly richen ed up (idle rpm gets lower), but still accelerate

quick ly. If it died bef ore the 5secs, check t he foll owing :

- If the rp m co nsta ntly decrease s an d ﬁ nally t he e ngine stops, the low speed needle is too

rich.

- If the idle-speed i ncreases during idle, the l ow spee d needle is too le an.

5. You may have to re-adjust t he idle-speed now. If it idles too high , the clutch may not relea se

compl etel y and you will lose „snap“ off the corner s. If it idles too low, it may stall at the start ,

or at the end of th e straight away when you release the thr ott le.

Ways to measure t he engi ne temp erature:

ture reading. Plac e the gau ge dire ctly over the e ngine p ointed at the g low plu g.

shoul d just slowly boil of f (2-3se cs). I t should not dan ce around as if it were on a hot griddle,

nor sho uld it lay ther e and steam.

Use after-run oil to keep everything lubr icated after you have ﬁ nished your day. A fter-run oil

helps fo r an easy start the nex t tim e and prote cts your internals against rus t. Use only „aft er-ru n

oil“ speciall y formu lated for R/C engines. Do no t use silicone shock oil or similar as th ey will

serio usly harm your engine. We recommend to use our LRP After-Run oil (No. 37910), which you

shoul d use regular ly af ter using your e ngine .

Proce dure:

First let the tank run compl etel y emp ty at idle until i t runs out of fuel (tr y re -starting it several

times ), next pu t a few drops down the open carbureto r and a few drops down the glow plug hol e.

Spin it over for 5 seconds on the st art er box and you are done.

Treat your engine w ith care and check it frequentl y. This engine will rev up to 38.500 RPM and

any fault at such high RPM can cause serious damage. All moving parts inside th e engine are

subject to wear, you must know if a piston/lin er/co nrod has wo rn out and i f they need t o b e

replaced. If you replace one part, please check if every thing else is still in good shape at the

same t ime. I f you only change one part and other par ts are in bad shape, there’s the possibility

that there will be a new failure soon !

Some import ant matter s:

the engine cou ld make c onsiderable damage.

crankshaf t is still round and at a g ood siz e. If not, also repla ce the cr ankshaft.

before inst allation an d pleas e use som e oil (af ter-run is su ited well) to l ubric ate every thing.

lower part of the piston and t he l ubricatio n hole in the conrod should be facing to the fr ont

(dire ction to the ca rburetor) .

shims.

screw. Repeat this for each screw, use the sta r-technique to tighten al l the screws complete-

ly. Do not overtighte n them!

PROBLEM

REASON

SOLUTION

Engine does not start

Glow plug defective

replace glow plug

Glow plug does not work

properly

check the condition of the glow plug

check the glow plug igniter

Engine is set too rich

(too much fuel, hits back)

check carburetor settings, repeat tuning

procedure

unscrew the glow plug completely and use

startbox for 5sec

Engine is too lean

(too little fuel, does not start)

check carburetor setting, repeat tuning procedure

Engine doesn

t suck in the fuel

check the fuel line for possible damage

check the carburetor setting

Engine stops after a

short time after glow

plug igniter has been

disconnected

Glow plug defective

replace glow plug

Bad fuel

replace fuel by fresh and correct type of fuel

Bad carburetor setting

check the carburetor setting, repeat tuning

procedure

Dirt in fuel line or carburetor

clean fuel line, clean & check carburetor

Fuel line damaged

replace fuel line

Loose glow plug or cooling head

tighten glow plug and/or cooling head

Air ﬁ lter old or dirty

clean or replace air ﬁ lter

Performance

decreases after

reaching operating

temperature or engine

stalls from time to time

Engine is set too lean

check the carburetor setting, repeat tuning

procedure

Glow plug defective or wrong

type

replace the glow plug by a correct type

Engine runs too hot

run-in process is not completed

Shims under comb. chamber

wrong

check number of shims

Engine

still keeps

running at high RPM

for a moment when

you release the throttle

Bad carburetor setting

open mid-range needle ¼ turn at a time and

re-adjust idle-speed

set idle speed lower

Glow plug, wrong type (too hot)

use glow plug with higher number (e.g. go from

5 to 6)

Shims under comb. chamber

wrong

check number of shims

Page 3

32809

Sec

CARBURETOR

38311 contains complete carburetor

383

823

383

38390

929

383

823

383

849

389

849

383

849

38390

823

383

849

EXPLOSIONSZEICHNUNG / EXPLOSION DRAWING

TUNINGTEILE / OPTION PARTS

ERSATZTEILE / SPARE PARTS

ORDER NO.

Artikelbezeichnung

spare part description

ORDER NO.

Artikelbezeichnung

spare part description

39293

Z.28R Spec.3 Truggy - Front Ball Bearing

38239

Z.28R Spec.3 Truggy

- Crankshaft

38130

Z.28R Spec.3 Truggy

- Crankcase

38234

Z.28R Spec.3 Truggy

- Rear Ball Bearing

38111

Z.28R Spec.3 Truggy

- Backplate

38235

Z.28R Spec.3 Truggy

- Burn Room & Head Shim Set

38237

Z.28R Spec.3 Truggy

- Piston & Sleeve Set

38390

Z.28R Spec.3 Truggy

- Various Parts Bag

38231

Z.28R Spec.3 Truggy

- Conrod

38490

Z.28R Spec.3 Truggy

- O-Ring Set

38232

Z.28R Spec.3 Truggy

- Wrist Pin & Clips

38311

Z.28R Spec.3 Truggy

- Slide Carburetor Set

38139

Z.28R Spec.3 Truggy

- Cylinder Head Set

ORDER NO.

Artikelbezeichnung

spare part description

ORDER NO.

Artikelbezeichnung

spare part description

36200

1/8

Off-Road Competition exhaust system

35030

LRP Platinum / Iridium Glowplug R3 - standard style

36201

Off-Road Competition

- pipe only

35040

36202

Off-Road

manifold

35050

36203

Off-Road Hi-Torque

manif

old

35060

36209

Off-Road Competition

- small parts set