We dont mind admitting weve got 3 SXV 550 s and not 1 of them is in any condition to turn a wheel all made in mid 2006 ,weve experianced every fault know to these bikes and some extra ones like low oil flow to the cylinder heads on all three bikes resulting in the valve buckets wearing out on a very fast & regular basis.I find it highly unlikley that weve been that unlucky to have the only 3 bike's , all with identical faults, the only reason we found this fault is because we check our valve clearances after every meeting because they close up very quickly when raced.These bikes have all been used on all the oil that Aprilia have recomended.
We have seen the works team when weve been in europe ,in the VDB truck they had at least 4 to6 spare engines
I have been in the m/cycle industry for 35 years having worked for all the major japs I've never seen the likes of this.
Worn valve buckets/camshaft& bearings
Oil pump seal Failure
Or any other serious mechanical failures that resulted in engine or chassis failure.
One suffered a coolant related failure upon inspection not only had the head gaskets failed the crankcases had warped also ,plus the camshafts and valve buckets were destroyed but this at the time was atributed to the water in the oil. This bike was totaly stock apart from silmotor.This motor is still sitting on the bench waiting for parts after having to recover it from the dealers.
The second SXV was a totaly stock motor fitted with a Aprilia approved exhaust (Akra) and foam air filter, fuel map modified to correct the AF as this was way out especialy on nos1 cyl which meant nos2 was doing all the work ,as it was with the silmotor but this was corrected with remapping the fuel system which balance both cylinders to the same power.What we had not been made aware of is that there where new pistons available which had been severly strenghtend if we had been made aware then they would have been replaced instantly as the nature of the improvement leaves no doubt in my mind that the old ones are flawed,If you dont belive me check for yourself, no manufacturer changes somthing that severly without good reason!.Every one has seen the pictures of the piston it did not suffer any detonation as is evident from the piston crown it just let go around the gudgeon pin eyes and it was only at around 5500 rpm then about to accelerate up.
The 3rd bike had been checked for all known faults Generator bolts loose valve buckets buckets worn at only 16 mls ,oil relief valves checked, throttle bodies balanced, water pump checked oil pump checked visually, then put back in frame and ran up ready for running in Sunday at Wild tracks the bike managed to do no more than 4 laps very slowly in comparison to how Matt usualy rides before we noticed smoke coming from the engine at which point we pulled him of and found that it had pumped engine oil into gear box at that point the outer covers were removed and reveiled that the oil pump seal had given out it was evident it was due to pressure by the apperance of the rupture in the seal ,so out the engine came again to reveal another set of trashed valve buckets at this point in time it is evident that all three bike are suffering from oil starvation to the head so we will not run them again until a solution is found .My only worry is that Aprilia dont recomend the valve clearances be checked for unrestricted bikes ,until 60 hrs given they run Ti valves these close up very rapidly and the engine has to come out, every one will put it of for as long as poss because of the cost involved by which time the bikes will be out of warranty and you will all be left with massive bills if this is a ongoing fault.
aprilia SXV went on the world market with lots of things wrong it!!!! hence I made and sold the solution just for one of them @ 25 squid a shot on the oil filter housing shitting its pants, just for the record i've done just over £1450 in that item alone that Aprilia got it wrong on something I new bike owner should'nt have to buy
did you see the internals shitting there pants???? I will PM you "off the record" just so you know were else on the bike it 'might fail' next before it throws you over the bars
What we are trying to find out is, if there is a fault with production over a period of time, as our bikes are all made within 6 weeks of each other, could have been a faultly mould at the factory which has now been replace, so problem solve. Or is it a design fault and everyone is going to have the same problem.
We're just trying to make people aware that they could have this problem, and if its a fault with the design, Aprilia need to be made aware of this so they can find a solution.
Now all our engines were standard internally, just different exhaust and fuel maps.
Two of our engines are being done under warranty by dealers, one engine has been waiting for the parts since January. The other engine hasn't been started on yet by the dealer. Now before we repair the 3rd engine we want to know if theres a fault with our cylinders because of when they were produce or if its a design fault that needs to be modifed.
Now according to the new British championship rules, I have to been at wigan to qualify, so what do I do. Do I wait for Aprilia to send the parts, or do I rush around and try a get a fresh bike ready within a week.
even the cylinders out so nos2 cylinder is not doing the bulk of the work in mid range, we have tried on the dyno one of the latest maps and the AF was far from correct.Our main concern is the rapid way the valve buckets wear and after trying all the oils recommended by Aprilia to no avail ,have investigated further to a point that we feel that their are issues with the oil feed to the cyl head especialy the rear cyl the front cyl has the same symtoms but the buckets seem to last 20 to 30 min longer.