352LikesNOVAROSSI Engine thread....
11-25-2013 | 06:39 PM
#6166
So guys, question..
Have I diagnosed this correctly if I think it is a leaky front bearing?
-P5XLT engine freshly pinched, only break-in done, new conrod, good crank
-irratic idle, sounds like motorboating "woooorrr wooorrr wooorrr" rather than one continuous stable sound
-at first engine ran fine, but towards the end of the day kept choking, despite being ran sufficiently lean
-seems to be carburated fine, but then after 1/4th lap on the track chokes for no apparent reason
-engine has truckloads of compression obviously
-front bearing is cheapo €4 ebay bearing
I'm thinking this means the cheapo front bearing has let go? Even if it has only less than 1 gallon on it.
Have I diagnosed this correctly if I think it is a leaky front bearing?
-P5XLT engine freshly pinched, only break-in done, new conrod, good crank
-irratic idle, sounds like motorboating "woooorrr wooorrr wooorrr" rather than one continuous stable sound
-at first engine ran fine, but towards the end of the day kept choking, despite being ran sufficiently lean
-seems to be carburated fine, but then after 1/4th lap on the track chokes for no apparent reason
-engine has truckloads of compression obviously
-front bearing is cheapo €4 ebay bearing
I'm thinking this means the cheapo front bearing has let go? Even if it has only less than 1 gallon on it.
you could have other problems such as air leaks from fuel system or carb. I always pressure test those under water to be certain. That would rule out most lean conditions.
11-26-2013 | 11:14 AM
#6171
Tech Master
Joined: Jan 2010
Posts: 1,628
I just thought I'd save a few $$$ on the cheapass ebay bearing, actually I got 4pcs for €4.. so that should have been a clue. Lasted 2.5-3 litres, so not even a gallon! But hey, lesson learnt.
Have ordered proper bearing now from Amain.
11-26-2013 | 04:20 PM
#6172
I put my hands up, take me off to rehab, I've been a bad bad boy!
I just thought I'd save a few $$$ on the cheapass ebay bearing, actually I got 4pcs for €4.. so that should have been a clue. Lasted 2.5-3 litres, so not even a gallon! But hey, lesson learnt.
Have ordered proper bearing now from Amain.
I just thought I'd save a few $$$ on the cheapass ebay bearing, actually I got 4pcs for €4.. so that should have been a clue. Lasted 2.5-3 litres, so not even a gallon! But hey, lesson learnt.
Have ordered proper bearing now from Amain.
dare I say this on the nova thread but the front bearing from reedy is actually very good in its sealing capability also
viva la novarossi !!
11-27-2013 | 09:29 AM
#6173
Tech Master
Joined: Jan 2010
Posts: 1,628
So I've ordered some NTN 607LH the blue one that's used on the XZ-B. I know LLH is NTN-speak for special seal against debris entering. What do you think about that bearing?
11-27-2013 | 09:45 AM
#6174
11-28-2013 | 09:01 AM
#6178
Tech Master
Joined: Jan 2010
Posts: 1,628
Other Q, got a Nova carb off P5XL that's been laying around on my table for about 2 months, now when I try the action on the slide it's like it has a notch sort of halfway, what would be the cause of this? could there be any oil gunked up, or does it mean it could have taken a knock or something?
11-28-2013 | 09:23 AM
#6179
Other Q, got a Nova carb off P5XL that's been laying around on my table for about 2 months, now when I try the action on the slide it's like it has a notch sort of halfway, what would be the cause of this? could there be any oil gunked up, or does it mean it could have taken a knock or something?
take it all apart and reoil it anyway Elvind , it should be smooth again
11-28-2013 | 12:13 PM
#6180
Tech Master
Joined: Jan 2010
Posts: 1,628
undo the barrel stop screw (idle) and remove the barrel , look around the slide recess's where the stop screw rides for damage . often times some good "lawn darts" while on throttle will wreak havoc on the slide barrel as well as the rod , the piston , etc. , etc.
take it all apart and reoil it anyway Elvind , it should be smooth again
take it all apart and reoil it anyway Elvind , it should be smooth again