I just found this forum! how excellent!
I’ve got a problem with a Malossi 170 kit that i’ve just put on my T5 Mk1. Hoping someone can help.
The kit was second had (ebay) but looked to be in good knick - one small scuff from a nip at some stage but not too bad.
I put the kit on one Saturday (new gudgeon pin, circlips, small end) and all seemed fine. Went for a big ride on the Sunday during which a metal-on-metal knocking noise developed, coming from the top end.
I dropped it to a local mech guy who said that the piston was hitting the head… but this was rubbish as there was no marking evident and the head was correctly machined by Chiselspeed who know what they are doing. (I even packed everything out with heaps of gaskets and started it up just make sure - no difference).
I have put the original T5 barrell and piston back on to check it’s nothing ‚downstairs‘ and the motor sounds sweet as a nut (just had new crank and seals etc two months ago)… so it’s definitely something to do with the kit.
I’ve put the kit back on now and the noise is nost noticeable at idle and sounds sort of like a metal rattle-tap-tap. Someone told me that the Malossi kit’s are machined too big so are often just noisy. It does sound like the piston wobbling in the bore and striking the sides in some way. I cant imagine that this is the way Malossi have designed this kit to sound though. Any ideas of what it sound be? It does change pitch when the clutch is pulled.
I am just riding the bike for a week after which i’m going to check the wear pattern… but am vaguley worried that it’s going to shatter the piston at some stage (and other riders look at me strange at the lights when they hear the rattle from my bike!).
Any help would really be appreciated.
Also! Any idea what jetting for a T5 172 with Simonini pipe? I ordered a 126 main jet but the bike chokes with it and has no power.
Thanks for reading this long post!