Radne Raket 120 Manuel d'utilisateur télécharger pdf (Page 11)

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20 Raket 95 Manual - English Raket 95 Manual - English 21

9. Service tips

Experiences from the previous engine

model, Raket 85, have taught us that a

Raket engine should normally not require

any comprehensive levels of service

during a racing season, since we believe

that a Raket 95 engine will be used no

more than 50 times per season. We do

not believe that it should be necessary to

change bearings, sealing rings and piston

rings several times during a season, such

as is required with more extreme kart

engines. It is of course up to every driver

and mechanic to make their own deci-

sions about what they think is necessary

or best.

The following simple service routines can

however be said to fall into the category

of normal maintenance work:

1. Lubricating the clutch parts.

We recommend that you lubricate the

bearing of the clutch drum. The clutch it

self shall be clean and not lubricated.

2. Silencer

As we mentioned previously, it is possible

to drill out the rivets at the back edge of

the silencer.

When you have done this you can remove

the end of the barrel and thus even the

damping material that is lying wrapped

around the barrel. Assuming that the

carburettor is setup normally and correctly

it should not be necessary to change the

damping material during a season. How-

ever we would recommend a change prior

to the start of each new season.

3. Servicing the carburettor

The only aspect of your Raket 95 engine

that requires regular service is the

carburettor. A diaphragm carburettor is a

quite amazing component that is capable

of operating in chainsaws, cutters and

other testing applications whilst working

problem-free for several years at a time.

As long as you are careful to only refuel

using well-ltered fuel, and always drive

with the inlet silencer attached, then you

should also be able to get through a sea-

son without needing to disassemble the

carburettor for cleaning and control. On

the other hand you must possess the abil-

ity to clean and setup your carburettor. To

that end there now follows a short tutorial

in carburettor service.

The carburettor is a Tillotson 319 A. If we

follow the passage of the petrol through

the carburettor we will be able to quickly

describe the carburettor’s function.

The carburettor has two caps, one made

of metal while the other is mould cast.

Under the moulded cap lie a rubber

diaphragm and a gasket. There is a small

chamber on each side.

One of these chambers is connected to

the engine’s crankcase via a channel.

When the pressure in the crankcase

changes the pump diaphragm in the

carburettor will begin to move. On the

other side of the diaphragm there is fuel in

the other chamber. When the diaphragm

moves the fuel is pumped in and out of

the chamber. Two small lip valves that are

cut-out in the same piece of rubber en-

sure that suction from the tank occurs and

that the fuel is pumped further towards

the carburettor’s inlet valve. The pump

should sustain a pressure of approx.0.5

kp/cm2.

It is quite simple to check if the pump is

working correctly. Take off the spark plug

so that it will be easier to move around

the engine. Ensure that the fuel line is

correctly attached and that the carburet-

tor is sitting correctly on the engine. All

gaskets should be OK. Ensure that the

hose running from the crankcase to the

carburettor is in place. Press carefully (we

emphasise – CAREFULLY) down on the

master diaphragm which you can reach

through the small hole on the die-cut

cover of the carburettor. When you press

down on the diaphragm the inlet valve

opens. Turn the engine around and check

to see if there is any fuel coming from the

tank.

If no fuel is coming then you should rstly

loosen the fuel line from the tank and

blow into the hose. You should still be

pressing down on the carburettor dia-

phragm. You should feel that it is possible

to blow air through the carburettor. If

you are not able to blow air through the

carburettor then you should take off the

moulded cap, because there is obviously

something wrong. Firstly check the small

fuel strainer (this has article number 3043

in the spare parts list). It may be clogged.

After that it is time to focus on the pump

diaphragm itself. It could be worn out, but

that is actually difcult to determine with

the naked eye; however if it has been

used for a while then you should change

it! Remember that one should always

change the gasket when one changes the

diaphragm.

The rule is: The diaphragm should be fac-

ing the carburettor casing – otherwise the

lip valves will not seal!

Now the pump should be working OK,

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Radne Raket 120 Manuel d'utilisateur Page 11

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