Noisy...??? 250 Monza

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el_guru
Posts: 31
Joined: Thu Jun 23, 2011 12:10 am

Noisy...??? 250 Monza

Postby el_guru » Fri Jan 19, 2018 10:49 pm

Hi Guys,

I finally had time to pull my 1965 Monza 250 out onto the lift and finish fettling it.
I had bought a few years ago supposedly "restored" but found a number of issues.....

So I have replaced the fork stanchions and rebuilt the front forks, replaced the rear hub cush drive, and replaced the camshaft bearings and reshimmed the bevel drive etc. (I have a 1929 Velocette KTT race bike which is also OHC bevel drive so not intimidated by it)

Anyway it started right up on first kick after 5 years stored away (in warm dry garage)....

I can appreciate a bevel drive is noisy but it seems quite rattly, which I appreciate is impossible to diagnose over the interweb... However are any of you clever gentleman anywhere near central NJ to be able to swing by and help me diagnose it.?
Or any other advice..?

Thanks Andrew.

6097516457

Jordan
Posts: 1380
Joined: Fri Dec 24, 2010 11:29 am

Re: Noisy...??? 250 Monza

Postby Jordan » Fri Jan 19, 2018 11:58 pm

Sometimes the top bearing for the vertical shaft isn't mounted properly, causing movement and noise.

el_guru
Posts: 31
Joined: Thu Jun 23, 2011 12:10 am

Re: Noisy...??? 250 Monza

Postby el_guru » Sat Jan 20, 2018 12:42 am

Thanks..... mine was slightly loose, had incorrect too thick gasket not allowing it to be located properly. So was replaced and shimmed so no further movement of bearing carrier..

Bevel bob
Posts: 1042
Joined: Thu Apr 15, 2010 8:01 am
Location: Bromley Kent UK.

Re: Noisy...??? 250 Monza

Postby Bevel bob » Sat Jan 20, 2018 5:14 pm

Its possible to assemble the gears and bearings in the steel bushings (top and bottom of the shaft) and think you have got nice close shimming, only for the bushings to move and upset it all ,particularly the bottom one. I get under the bottom bevel gear and give it a tap upwards with an alloy or copper drift to see if it will move (usually due to a missing or wrong big shim above the bearing).Its also important that the shim pack at the top of the shaft leaves no clearance at the circlip. Rocker spindles are also a wearing item.

jbcollier
Posts: 86
Joined: Sun Oct 10, 2010 2:30 am

Re: Noisy...??? 250 Monza

Postby jbcollier » Sun Jan 21, 2018 1:06 am

At this age, it could be many things. The last two I did had bad big ends and were very noisy indeed. Did you check rod for play while the head was off?

el_guru
Posts: 31
Joined: Thu Jun 23, 2011 12:10 am

Re: Noisy...??? 250 Monza

Postby el_guru » Sun Jan 21, 2018 11:51 am

Thanks for the replies so far...... most appreciated.

I have been listening to lots of youtube videos (tricky as mics pick up all sorts of noises) and there seem to be a number making a similar racket but others pretty quiet.

Before I start tearing it down I was hoping someone possibly close could listen to it. I am happy to take it to have it listened to.... poor thing.

JimF
Site Admin
Posts: 1124
Joined: Fri Oct 23, 2009 2:49 am

Re: Noisy...??? 250 Monza

Postby JimF » Sun Jan 21, 2018 3:43 pm

You might think about taking a cell phone video and posting it here or on YouTube with a link here as the audio track may help forum members make a better diagnosis.

Jim

el_guru
Posts: 31
Joined: Thu Jun 23, 2011 12:10 am

Re: Noisy...??? 250 Monza

Postby el_guru » Sun Jan 21, 2018 7:55 pm

Thanks Jim, i will do that

el_guru
Posts: 31
Joined: Thu Jun 23, 2011 12:10 am

Re: Noisy...??? 250 Monza

Postby el_guru » Thu Jan 25, 2018 6:33 pm

Hi Guys, managed to make a brief video of the Monza running....

https://www.youtube.com/watch?v=V_spR8bwC1A

any advice welcome..... Thanks.

graeme
Posts: 938
Joined: Sun Mar 25, 2012 12:00 am
Location: Tasmania Australia

Re: Noisy...??? 250 Monza

Postby graeme » Thu Jan 25, 2018 9:11 pm

Sounds like the rocker to valve gap is too great.
I had a 450 make a similar noise even after careful shim adjustment.
Turned out to be the rocker spindles were worn in the head casting and moving around
Same noise, but hard to be sure from a video


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