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Post by ianmartin40 on May 28, 2016 10:17:33 GMT
 this is from an engine I bought from gumtree some years ago, it is very fast but had a heat sieze while using at speed, the engine nipped up only when I eased off from nearly full throttle, unsure of speed as speedo is old and was off the clock. I had no idea of the history of the motor but it has a polini kit on it and was running a 24mm carb from a px200 with bigger jets, I made it even richer after sieze to keep using it but have decided to strip and make sure no air leaks etc. there has been a lot of material removed from crank, is this normal? I have seen some indian lml 5 port cranks which look similar and just as rough. if you cannot open the link I will try to sort other pictures advice appreciated |
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Post by djloone on May 28, 2016 15:22:51 GMT
I can see it...and it does look "well used", ..but if it was flying along...bung it back in  LOON-E |
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Post by henri on May 28, 2016 17:01:49 GMT
i'd say from picture at a guess inlets been opened/increased by bout 7.5 to 10 degrees , from cut shiny marks i can see . bout what it would need anyway . as dj says if its still true an big ends good i'd re-use . tho the marks on bearing journal clutch side might suggest its been "running" its bearing ,but probably from piccy not actually there .if clutch side bearing sits tight on it ,its good to go from what i see . H
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Post by ianmartin40 on May 29, 2016 12:45:12 GMT
 My worry was that the work on the crank had been carried out by an amateur tuner who was a bit rough, I thought the idea of gas flowing was not to have any rough surfaces and any removed metal areas would then be polished. the conrod has a small amount of sideways play in it but if crank secured there is no movement up/down of conrod. the bearings and seals all look genuine or good quality items and it is a polini kit so I don't think the person doing the work on this engine was doing it on the cheap. I have done just over a thousand miles on this engine and the piston/barrel clearances are tight and the rings look to be in good order and not worn, however the base gasket was a std item and covered quite a lot of the opened out ports which I thought a bit odd. |
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Post by henri on May 29, 2016 13:11:02 GMT
that crank hasnt been gas flowed ,just cut/inlet increased .the conrod will move side to side a tiny bit ,but you can see the bearing spacer washers still there ,an no up/down means its good to go . an ive often found rushed/skimped bits like std base gaskets covering ports ,polini dont do base gaskets an people dont know to get nail scissors out n trim to size .tho this leaves a very thin gasket around outside transfers ,its better to buy a sheet of gasket paper an make your own.H
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Post by ianmartin40 on May 29, 2016 20:02:05 GMT
Cheers for that Henry
I checked crank into clutch side bearing and it was tight, I had to chap it back out! so looks like it is going back in
Ian
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Post by pxguru on May 29, 2016 20:30:37 GMT
Crank is ok. On a bolted on kit it won't make much differenace if its a bit rough. Been run with a loose clutch nut at some point. Stick it back in but properly tighten the clutch nut A correctly cut base gasket will help no end. Any work done on the casing inlet? Standard P200 cylinder head? |
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Post by ianmartin40 on May 30, 2016 8:59:30 GMT
PX guru you are correct about clutch nut it came loose and gave me loads of clutch problems last year.
It is a px 125motor with polini piston barrel and head and yes there has been work done on the casings, maybe a little too much work on the casings, check out my next post "repair a hole in the casing"
cheers
Ian
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Post by doulsy on May 30, 2016 15:11:14 GMT
i have some gasket paper if you need it
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Post by pxguru on May 31, 2016 5:38:28 GMT
oh that kind of baby Polini  thought you meant my favorite kit, the iron Polini 207. These don't come with a head. Would still like to see a photo of the carb inlet from the inside. From your other pictures of the top it has been interferred with. Hopefully you dont need a reed conversion! |
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Post by ianmartin40 on May 31, 2016 9:21:34 GMT
 been tampered with but a bit less brutal than the rest of the casing, nearly smooth! |
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Post by ianmartin40 on May 31, 2016 9:28:16 GMT
 same pic just different angle. I was thinking about running this with the si 20mm carb, previously it was the si 24mm as I don't need full potential from this motor, I also ran a std exhaust as it is in a 1961 frame |
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Post by ianmartin40 on May 31, 2016 9:34:27 GMT
 that was the same pic twice! |
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thought you meant my favorite kit, the iron Polini 207. These don't come with a head. 
