thought i had blown it up (runner 172)

coming home from work shiny red made horrible noise and stoped tried to start it horrible noise again , thought i blown it up ,put it me car and brought it home ,kicked it over same noise ,took the side off and bugger me the fan at the front had come off ?i have never touched the engine before not side cover off any way ,new manfold , carb clean and stuff but not inside,now bit of history got it in july ride it every day ramp the f@@k out of it for about 2 miles to work then back odd trip fags chips etc?since i have had it the casing has had 1 mm washers inbetween it and the engine ?any way took the fan right off moved the belt got to the athena moved it and the rollers fell out :w00t: got a big flat spot on em about 5 mm ?put em back in put the fan back on tightened the nut up and casing back on and runs fine went out seems fine f@@king flies did about 10 mile in the pissing rain no problems ,sorry for the waffle is this normal :msn1:

 

This happened to me aswell LOL
broke half the lil white fan

Its because of the variator nut, some say tighten it to 40nM etc some say tighten it all the way

Best thing to do get a brand new nut and use loctite

 

only ever does this if you tighten it down to the belt, not the crank. make sure the belt is slack.


make sure the splines are still intact on both the crank and the pulley.

 

will do thanks

 

yep as wobbly says make sure your not tightening the pulleys against the belt..

make sure the belt is at the top of the front pulley before tightening nut on the variator....you will have to push the belt down the rear pulley a bit to acheive this

youd be amazed how many people dont know this!!

 

I admit i didnt know this myself
first i've ever read about it anyway

Thanks for the info

 

yeah splines are ok(bit of a shame really wife would of let me buy a new malossi crank if it was f@@ked)thanks for the advice dave and wobbly wot about the flat spot on the rollers?if i do the casing up with out the washers inbetween the fan rubs the outer casing ???????????????

 

when you say rubs you mean grinds along the kickstart mechanism cover?

if so then your belt still aint sitting high enough when tightening. belt needs to have enough slack variator side to be 3/4 of the way up atleast.

that way it'll all tighten up as it should.

 

thanks stevo but i am sure belt was slack gonna take it apart and try again ,its got 20:17 malossi rollers 10grms no one seems to have 10 grms every weight but 10 :w00t: tried pm,adrenlin ,scooter center ? just been on s.i.p to look for rollers and they have got the latest rollers best thing since sliced bread by doctor pulley and they have a flat spot on em confused to f''k now,if i get the right size and weight can i make my own rollers out of teflon?

 

they grind sometimes, if you have a shim between the varo shaft and the outer pulley then try it without, make sure the varo nut tightens against the outer pulley, not the end of the threads, need a fairly thick washer i beleive.

 

He he. I had that problem! It costed me a belt! I forgot to put the thick washer on and it allowed the finned pulley to vibe!!

 

ordered some ten grm rollers from easy parts nl only place thats got em in stock ?spoke to crazy eyes today and he said ten grms are to light but thats wot is in there now ,says so on them and i weighed them ,its a 180 with 172 kit scrop exhaust 25 mm carb malossi manifold and reeds athena speedmaster variator ,on acceleration it just wants to wheelie flies up to 82 mph(sat nav never lies)crazy knows his runners but any other advice on the rollers i would be most gratefull :w00t:

 

thanks minor thats what crazy said too,i am sure that i would notice it hit the rev limiter though ?ordererd some 12.5 grm ones now as well .gonna give them a go

 

this is probably not the way to do it but what i do is put a screw driver through the fins on the fan and tighten against that watch your knuckles though