We at Cava Motorcycles do on average 30 -
Well here is why...
1 I've seen freshly bored cylinders with too much piston clearance.
2 Port edges not dressed which would eat the piston rings alive.
3 Cylinders which have not been honed and out of round. (Oval)
4 I've seen cylinders that have had their coatings bored out of them then ran!
5 Twin cylinders with odd size bores!
6 Cylinders bored out on a lathe.
Most Motorcycle shops can rebuild crankshafts, very few are good at it!
Crankshafts for single cylinder two stroke engines consist of Counter weights, thrust washers, crank pin, big end Bearing and a connecting rod. These components must be assembled to Exact specifications. Even 1 thou out of specification will cause vibration. Vibration will rob you of your horsepower, reliability and it drastically reduces engine life.
I’ve seen brand new factory crankshafts off by as much as 5 thou center to center, The record goes to a local competitor who thought that 15 thousandths of an inch was close enough!
We’ve assembled hundreds of crankshafts to specifications as close as 1 tenth of a thou! This takes patience, time, and experience. Don’t trust this type of precision work to the first person you meet with a press and hammer.
The problem with getting your crankshaft rebuilt is it always looks ok. Most people don’t own the proper equipment to check the shaft when it returns from the shop. Motorcycle mechanics know this! This ensures that you get what you pay for.
Now this is why you should trust your crank shaft with us.
Cava Motorcycles -
Why sleeve it?
Firstly it is more economical than plating. Once a cylinder has been sleeved if you wear it out or damage it you do not then need to have it completely re-
Motorcycles & Quads whether you are a road or competition rider we hope you enjoy the season ahead. Unfortunately there will be times when this is interrupted by breakdowns. Our aim is to get you going again in as short a time as possible, whilst providing a top quality service at a competitive price.
However whilst you obviously need to get damaged cranks, cylinders etc., repaired it is important to try to identify the cause of the problem ie if your cylinder has overheated and seized the piston, are the crank seals worn out causing the engine to run a weak mixture and overheat? It can be very disappointing to spend hard earned cash on repairs only for the same problem to occur immediately after a repair. So do check it all out. If we are carrying out your repair we will always be happy to try and give advice.