Cursed KTM 530 EXC-R — 250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes) — ThumperTalk

3 Фев 2015 | Author: | Комментарии к записи Cursed KTM 530 EXC-R — 250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes) — ThumperTalk отключены


Posted 28 January — 10:43 AM

This began on November 7, 2008.

the third right crankshaft failure on my 2008 KTM 530 EXC-R, Z obtained new cases under and I paid for a top end rebuild, new rings and a job at 73.3 hours.

I got the bike and rode 40 miles in the rain in the The bike ran great.

At home on the bike suddenly would not I troubleshooted the problem to ignition. replacing the ignition coil and CDI controllers with my son’s I was still stumped.

Finally, I noticed that the resistance was not consistent.

I had installed the Tech regulator and stator on bikes months ago to keep up the demands of the cooling fan.

two days of checking and re-checking etc. I decided to pull the cover off and try the stock stator and

Check out what I discovered. Z left a loose bolt in the case that wore two of the stator coils. They are the TT stator for me.

Good that it didn’t go the cam chain and sprockets.

The Curse

After the stator/loose bolt was corrected, my 530 ran great for a total of 18 since Z Racing’s rebuild. The then began smoking and oil.

I rode it another 12 tried Rotella oil, that switching from a synthetic oil may reseat the rings. A down test revealed 10%, all through the rings.

The continued to smoke and I disassembled it for top end rebuild. The top end looked good and of Trail Tricks lapped the and replaced the valve guide I installed new rings and the cylinder like new with great marks visible.

After the top end rebuild again, the results. My 530 smoked like a train and used a LOT of oil.

New and a fresh head, same I got thinking about the fact the engine is a dry sump design uses three oil pumps, one to the sump, one to pressurize the engine, and the to pressurize the transmission. Also, I had that the sump (removing the on the right case that the crank at TDC) contained a bit of oil when draining all the engine which it did not in the past and my son’s 530 had little oil in the crankcase sump changing oil.

I was thinking that possibly the had not been scavenged and was acting as a wet system and flooding the cylinder/rings too much oil for the rings to prevent entering the combustion chamber.

So. something may be wrong with the suction/scavenge pump. Z Racing had the oil pump rotor backwards so the pin on the shaft that turns the lost contact with the slot and the pump was inoperative.

I reversed the rotor to capture the pin the shaft slot and the rotor

I have ridden it about 10 and it is a LOT better but still was smoking at times. I hope the new rings not been ruined by being with oil and may not seat now. I try another weekend ride to see if the will seat.

If not, I will have to another new set of rings.



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