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monza cylinder head

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ben View Drop Down
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    Posted: 08 Aug 2019 at 20:22
hi Ben here.  I have a monza with a cylinder head issue .
it seems to have a hole in the threads of the spark plug! had anybody hurd of this . it had evidence of oil leak on head . and also do 350 heads fit on a v5 ? chèers any advise aprecieated xx
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Chris A View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris A Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2019 at 20:50
350 has smaller valves and inlet tract.Not totally unheard of smallblock heads to crack between the valves but not sure if this is your problem.Probebly cure it with a timesert  or welding.650 heads are the same spec as the Monza  if memory serves me right.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2019 at 09:41
I have suffered with a cracked head, between the valves, on a V50/3 but not sure what you mean by a hole in the plug threads. Try posting a picture.
The only direct replacement head would be from a V50/3 (or Monza of course) and as mentioned the V65

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Edited by c13pep - 09 Aug 2019 at 10:20
you can`t have any fun in a straight line

Monza
Honda CB77 project

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ben View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ben Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2019 at 13:45
I'll try for picture later but. there is a 3mm x 8mm hole half way down the threads in the spark plug hole . seems to be leaking oil out . are the 350s def smaller inlet could I not just cut new bigger  valves in , I ask this cos I can only find 350 cylinder heads second hand  I'm yet to take the head off to see underside but on removal of rocker cover it looks like it would be very tight to weld it up . maybe I can bore it out and plug it and then cut new threads ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2019 at 20:56
The 350 heads are different both in valve size and port diameter, the inlet tract being 7.5mm larger diameter on the V50 as is the inlet valve at 3mm larger.
Which head is at fault left or right
There are heads for sale but at £280 a pair it would be more cost effective to buy the complete motor being advertised by homernmarj on EBAY. It might be worth a message to him as he often has V50 parts for sale as does Gutsibits who list used heads at about £100 when available

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you can`t have any fun in a straight line

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris A Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2019 at 22:23
Also try Reeboot Guzzi and ebay germany...or get a damm good welder onto it !

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ben Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 2019 at 18:32
ok so I've done it I made a threaded insert ,tapped the head to m20x1.5 and locktite'd it in . and have received in under a week my new gaskets from gutsibits.  fingers crossed it works .
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ben Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 2019 at 18:45
how do you put photos on here I tryed but?

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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 2019 at 22:34

Note where the image properties window says "maximum file size 400 kB". Lot of people have trouble resizing photos smaller.

If you took the photos with a smart phone it may have the option to be able to resize photo(s) smaller when you email it / them to another email address.

If you're using a PC with MS Windows then Windows Paint might be able to resize images, depending which version of Windows. Windows 10 Paint does. Or there are also online resizing tools.

The key thing is you have to get the file size under 400 kB, and phones and digital cameras tend to make the pictures huge, for best detail resolution.




"Chicken nuggets don't dance on a Tuesday."
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 2019 at 22:36
I've only just noticed you've only got 5 posts (at time of writing), so there may be a post count threshold limit before you can start uploading photos.

"Chicken nuggets don't dance on a Tuesday."
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