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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-filtered 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 firstly 

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 difficult 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, 

Содержание Raket 95

Страница 1: ...Owners Manual ENGLISH ...

Страница 2: ...Raket 95 WARNING Under no circumstance is it allowed to change the original design of the engine without a written acceptance from the manufacturer You should always use original spare parts Unau thorised changes or non original spare parts can lead to serious damages Contents Owners Manual Raket 95 2 1 Safety 4 2 Instructions for handling and charging a Raket 95 starter battery 6 Safety instructi...

Страница 3: ...pped with appropriate protection so that such incidences of contact are avoided and to act in an appropriate fashion so that no injuries of this type occur Radne Motor accepts no respon sibility whatsoever for injuries to people that may occur as a result of something becoming trapped between the rotating parts of a Raket 95 engine 5 A Raket 95 engine is propelled using a flammable fuel alkylate p...

Страница 4: ...t automatically stops charging when the battery has reached its full capacity 7 A NiMH battery should not be discharged so that the terminal voltage drops to be low 11 0 volts If you discharge the battery too deeply then one of the battery s cells may be damaged in which case you will no longer be able to recharge the battery to its full capacity 8 A NiMH battery should not be charged until most o...

Страница 5: ... battery before you put your kart into storage for the winter If you store away your kart in the autumn with a discharged battery then the battery will almost certainly be inoperable when you take out your kart again in the spring For this reason you should allow your battery to remain charging on trickle charge mode during the period that you will not be us ing it 19 If your kart is to be stored ...

Страница 6: ...commend the use of Radne Motor s holder article number 5208 7 When it comes to mounting the battery battery box and the connection between the battery and the starter motor a de scription of how to do this can be found in a separate section of this manual 4 Starting and stopping the Raket 95 engine Thanks to the Raket 95 engine being equipped with an electric starter it is nor mally very easy to s...

Страница 7: ...engages If the engine hesitates or even stops then you should test the effect of slightly increasing the Low Speed screw Start with half a turn When you have found a setting at which you can apply the gas and the engine responds immediately then it is time to move onto the setting of the High Speed screw H 6 Drive a few laps of the track so that the engine is really warm Listen thereafter to how t...

Страница 8: ...pective channel into the cylinder You may wonder why the air that travels on the top side of the throttle doesn t suddenly stop when it no longer has any depression to pull it Well when it comes to air it happens to be the case that when one part of an air mass moves it pulls the surrounding air along with it When it comes to the operating strokes when the piston moves downwards into the cylinder ...

Страница 9: ...ple involved is that abso lutely no changes or modifications may occur The engines should be out of the box in other words exactly as they are delivered Below follow some clarifica tions 1 Crankcase The crankcase should have the same design as shown in the picture The measurements that are of decisive importance are those relating to the part of the crankcase that exactly encloses the crankshaft I...

Страница 10: ... nature that the original silencer can be used without any alterations what soever The exhaust system for Micro has a re strictor washer assembled at the cylinder connection The restrictor washer has a diameter of 14 mm One can divide the silencer by drilling out the rivets and replacing them with suitable screws When the silencer is divided one is able to check on the amount of damp ing material ...

Страница 11: ...ugh 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 ...

Страница 12: ... should open and after that it should re lease air through it down to a pressure of approx 0 5 kp cm2 Now the valve should be totally sealed If this test does not appear to have worked properly then the question is what should we do next The most common problem is probably that the valve is not sealed and in that case one must search for dirt or pores or else change the needle valve PLEASE NOTE Le...

Страница 13: ...gasket 0 25 35091 Needlebearing 35092 Crankshaft complete 35096 Washer clutchdrum 35132 Exhaust flange Raket 95 35144 Clutch drum 35147 Needlebearing for clutch 95 35150 Crankcase 35151 Crankcase gasket 35154 Cover for starter support 35155 Neeedlebearing bendix 35156 Support for start engine 35158 Bendix for startengine 35159 Startergear with clutch complete 32112 Startbutton for Raket 95 120 355...

Страница 14: ...nual English 27 Splitdrawing manual start 35059 Aircoat 33134 String disc 07 33153 Start boss 33131 Axle for stringdisc 07 35205 Starthandle 33138 Start string 33136 Frictionring Aluminium 33132 O Ring för string disc axlee 55156 Screw countersunk 6x20 55392 Countersunk aluminium washer 6X20 3013 Plate 3014 Screw 3015 Choke axle 3016 Cap 3017 Main diaphragm 3018 Gasket 3019 Screw 3020 Expansion ca...

Страница 15: ...Radne Motor AB Markörgatan 2 136 44 Handen Stockholm Sweden Tel 08 556 506 90 Fax 08 556 506 91 info raketengines com www raketengines com Your dealer ...

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