guzziriders.org - moto guzzi forum Homepage
Forum Home Forum Home > Technical > Small Blocks
  New Posts New Posts RSS Feed - V50 Monza stock breather box VS pod filters
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

V50 Monza stock breather box VS pod filters

 Post Reply Post Reply Page  12>
Author
Message
Monza_rider View Drop Down
Falcone
Falcone
Avatar

Joined: 01 Jun 2020
Location: Belgium
Status: Offline
Points: 12
Post Options Post Options   Thanks (0) Thanks(0)   Quote Monza_rider Quote  Post ReplyReply Direct Link To This Post Topic: V50 Monza stock breather box VS pod filters
    Posted: 01 Jun 2020 at 16:31
Hi everyone,

I recently acquired a beautiful Monza bike fitted with pod filters and stock jets. It didn't came with the original breather box, the oil overflow of the headers are just connected to a tube that leads to the ground. Doesn't seem ideal imo.
I read a lot on the forum, many people suggest the stock breather box is the way to go. What are your opinions?
Does anyone have a Monza fitted with pod filters and if so, what rejetting has been done?

Kind regards!

Jesper
Back to Top
Chris A View Drop Down
Senior Member
Senior Member


Joined: 15 Dec 2018
Location: France
Status: Offline
Points: 330
Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris A Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2020 at 16:36
Stock box is a complete bar steward when it comes to filter change ..but works the best.For pods to work correctly you need to revise the carburation over the whole range so be prepared to change all the jets and the slide .
Back to Top
AdrianW View Drop Down
Senior Member
Senior Member


Joined: 05 May 2019
Location: Bristol
Status: Offline
Points: 993
Post Options Post Options   Thanks (0) Thanks(0)   Quote AdrianW Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2020 at 19:18
Hi Jesper,

I have a 1982 V35II with pod filters (found receipts from Gutsibits in paperwork).

The drain / crankcase breather has a small filter attached to the end of the original pipe. I left that in place.
The two breather pipes from the rocker boxes simply vented open onto the engine below! I have fitted a "Y" piece and another length of pipe so these now vent down towards the floor near the starter motor. I have not seen oil emerge from this yet - I am however used to British bikes where this sort of thing is "normal" !

My bike ran rich and while trying to sort this I have started to collect the parts necessary to revert back to the stock airbox arrangement should I need to in the future. Like you I heard the stock setup gives the best running so I am keeping it in mind.

The richness has been largely (I hope - more testing soon) cured by work to the carbs. New choke mechs (manual at present) , float needles, main needles & needle jets. My bike came with slightly larger pilot jets, otherwise everything is standard,

A PO had also hacked the plastic inlet pipes to fit the pods....  not something I would recommend although it does ensure the tract remains the right diameter !

If you have decent pods I think you can probably get the bike to run well with minimal changes to jetting. Cheapo ones I believe can be troublesome.

On balance I prefer the "if it ain't broke" approach. If your bike runs well with the pod setup then I would go with that, unless you have real problems with carburation.

As the weather is great at present I would ride it and see how it goes..

Have fun..
Adrian
Bristol UK


Back to Top
c13pep View Drop Down
Senior Member
Senior Member
Avatar

Joined: 31 Aug 2017
Location: Doncaster
Status: Offline
Points: 2110
Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2020 at 19:56
My Monza is fitted with pod filters but I run standard jetting apart from a 130 main jet, however all the jets were renewed on recommissioning.
My breather system consists of plugging up the sump return and routing the rocker box breathers one to each pod filter via a hose connector drilled into the chrome endplate of the pod. Thus oil mist etc. is burnt off in the engine but this does require regular oil level checks.

CHRIS    
you can`t have any fun in a straight line

Monza
Honda CB77 project

Back to Top
Motty View Drop Down
Senior Member
Senior Member
Avatar

Joined: 03 Jun 2015
Location: South England
Status: Offline
Points: 269
Post Options Post Options   Thanks (0) Thanks(0)   Quote Motty Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2020 at 23:48
The original airbox on my V35 disintegrated whilst the bike was in hibernation, it's was a hideous thing anyway (IMHO of course).
I prefer the look of the pod filters, it was worth the piddling around with the jets to lose the airbox.
Good luck whatever you decide to do
It’s more fun to try to ride a slow bike fast .....
Back to Top
iansoady View Drop Down
Senior Member
Senior Member
Avatar

Joined: 23 Jul 2017
Location: Redditch
Status: Offline
Points: 2402
Post Options Post Options   Thanks (0) Thanks(0)   Quote iansoady Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2020 at 09:49
My V50 has pod filters (no idea of the make - they were on when I got it). I have to say that carburation seems fine to me. For some reason my bike has 28mm carbs instead of the 26mm standard ones (possibly related to the fact that it started life as a V35 and had an engine transplant, I believe when it was imported from Italy).

I haven't looked at the jetting - as Adrian says "if it ain't broke".
Ian
1952 Norton ES2
1986 Honda XBR500
1958-ish Greeves/Triumph in progress
Back to Top
Monza_rider View Drop Down
Falcone
Falcone
Avatar

Joined: 01 Jun 2020
Location: Belgium
Status: Offline
Points: 12
Post Options Post Options   Thanks (0) Thanks(0)   Quote Monza_rider Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2020 at 10:03
Thanks for the great responses! Glad to hear people are able to get their bikes running ok with pods. Any recommendations for pod filters? K&N seems the best option? 
Back to Top
Motty View Drop Down
Senior Member
Senior Member
Avatar

Joined: 03 Jun 2015
Location: South England
Status: Offline
Points: 269
Post Options Post Options   Thanks (0) Thanks(0)   Quote Motty Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2020 at 10:28
The pod filters I used are whatever brand the Gutsibits were selling, I didn't investigate any further than that. I thought they was K&N, but they may have been K&N copies
It’s more fun to try to ride a slow bike fast .....
Back to Top
c13pep View Drop Down
Senior Member
Senior Member
Avatar

Joined: 31 Aug 2017
Location: Doncaster
Status: Offline
Points: 2110
Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2020 at 11:53
K & N are the best but I couldn`t find any when I needed them and most now seem to be Chinese copies, which in my case, work fine. When buying a set of pods the size required is 42mm (carburettor boss size) however it is important to ensure that the internal diameter throughout is no less than 28mm otherwise the air flow will be restricted.

CHRIS
you can`t have any fun in a straight line

Monza
Honda CB77 project

Back to Top
telegraphroad View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 May 2014
Location: M11 J8
Status: Offline
Points: 204
Post Options Post Options   Thanks (0) Thanks(0)   Quote telegraphroad Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2020 at 14:00
I am nearing the end of a long and slow conversion of my V50 Monza back to standard factory air box and filter. I have been gathering the necessary parts for a while and finished the carb rebuild a few days ago. My word it's a faff assembling all that gubbins on to the bike!

I'd love to be able to report back on how it compares to the pod filters but since the carb rebuild kit didn't include seals for the choke pistons and I prised the old ones out before I realised - I can't. Why the kit doesn't include these seals I can only imagine, but I note that you can buy new (zinc!) pistons and seal assemblies separately. I've ordered some rubber discs to refurbish my original (brass) pistons so when those arrive I'll be able to set up the carbs and see how things stand.

FWIW the bike was on pod filters when I became its latest keeper and was still running on standard jets/needles/atomisers. Not very well I might add. After experimenting with various main jets I settled on 130 as the best compromise. I am expecting to refit the original main jets now that the std air box is fitted.
V50 Monza
VFR 800FI
Herts / Essex border
Back to Top
AdrianW View Drop Down
Senior Member
Senior Member


Joined: 05 May 2019
Location: Bristol
Status: Offline
Points: 993
Post Options Post Options   Thanks (0) Thanks(0)   Quote AdrianW Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2020 at 14:34
Where did you get your carb kits from??
The Dellorto ones I got from Niks Euro Bits certainly contained the choke "O" rings and a couple of others besides.

For my 26mm VHBZ carbs I used kit :  COD.52510-77 GUARNIZIONI VHBT

Cheers,
Adrian
Bristol UK
Back to Top
AdrianW View Drop Down
Senior Member
Senior Member


Joined: 05 May 2019
Location: Bristol
Status: Offline
Points: 993
Post Options Post Options   Thanks (0) Thanks(0)   Quote AdrianW Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2020 at 14:38
Sorry, Just read the post properly !! 

No, carb kits do NOT contain the choke seals, only the "O" rings.  I replaced mine with manual chokes because they were on a very cheap offer at the time.
I reckon you will probably have to shell out for new as I couldn't get the ones out of mine either..

Apologies for the confusion.

Adrian
Bristol UK
Back to Top
Monza_rider View Drop Down
Falcone
Falcone
Avatar

Joined: 01 Jun 2020
Location: Belgium
Status: Offline
Points: 12
Post Options Post Options   Thanks (0) Thanks(0)   Quote Monza_rider Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2020 at 13:36
So only 130 size main jet? No other adjustments of the other jets or needle? Thanks!
Back to Top
AdrianW View Drop Down
Senior Member
Senior Member


Joined: 05 May 2019
Location: Bristol
Status: Offline
Points: 993
Post Options Post Options   Thanks (0) Thanks(0)   Quote AdrianW Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2020 at 13:58
Not sure here, my bike is a V35II but 130 sounds a bit large...

According to my workshop manual standard specs for V50III / Monza /V50C are :-

Carbs : 28mm  PHBH 28B (D) right (S) left
Throttle Valve 50
Atomiser  268T
Main Jet  118
Idling / Pilot Jet  50
Starter Jet 60
Needle X6 (3rd notch)

Hope this helps..   If the plugs look the right colour then I would keep it as it is. If they don't ....

Cheers,
Adrian
Back to Top
Monza_rider View Drop Down
Falcone
Falcone
Avatar

Joined: 01 Jun 2020
Location: Belgium
Status: Offline
Points: 12
Post Options Post Options   Thanks (0) Thanks(0)   Quote Monza_rider Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2020 at 14:14
Hi Adrian,

Yes, my Monza has the carbs running everything stock.
2 people in this thread said they've tried different jets and both settled on 130 main jet on their Monza's so I figured I'd start there.
Back to Top
 Post Reply Post Reply Page  12>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.078 seconds.