High speed jet H
Checking the front hand guard
At the factory the engine is adjusted at sea level. When working at a high altitude or in different weather conditions, temperatures and atmospheric humidity, it may be necessary to make minor adjustments to the high speed jet.
Make sure the front hand guard is not damaged and that there are no visible defects such as cracks.
CAUTION! If the high speed jet is screwed in too far, it may damage the piston/cylinder.
When test run at the factory, the high speed jet is set so that the engine satisfies the applicable legal requirements at the same time as achieving maximum performance. The carburettor’s high speed jet is then locked using a limiter cap in the fully screwed out position.The limiter cap limits the potential to adjust the high speed jet to at most half a turn.
Move the front hand guard forwards and back to make sure it moves freely and that it is securely anchored to the clutch cover.
Correctly adjusted carburettor
When the carburettor is correctly adjusted the machine accelerates without hesitation and 4-cycles a little at full throttle. It is also important that the chain does not rotate at idle. If the L-jet is set too lean it may cause starting difficulties and poor acceleration. If the H-jet is set too lean the machine will have less power, poor acceleration and could suffer damage to the engine.
Checking the inertia brake release
Checking, maintaining and servicing chain saw safety equipment
Place the chain saw, with the engine switched off, on a stump or other stable surface. Release the front handle and let the saw fall by its own weight, rotating around the rear handle towards the stump.
Note! All service and repair work on the machine demands special training. This is especially true of the machine’s safety equipment. If your machine fails any of the checks described below we recommend that you take it to your service workshop.
Chain brake and front hand guard
Checking brake band wear
Brush off any wood dust, resin and dirt from the chain brake and clutch drum. Dirt and wear can impair operation of the brake.
When the bar hits the stump the brake should be applied.
Regularly check that the brake band is at least 0.6 mm thick at its thinnest point.