Parts substitution

[MotoMike]

On my 450 I am working my way through it. As I said somewhere, I am not restoring it as it had been modified when I got it. but want to make proper connections and solid mountings of the fittings I have. for instance, the tank is supposed to have a shouldered sleeved rubber insert on each of the front ears that are bolted to the frame.
Do you know of a substitution for the rubers and what size are the bolts
I think I can fabricate a proper catch for the back of the tank.
Pipe hanger/rear foot rest. what size is this bolt.
head pipe to head gasket. any commonly used substitutes here?
points and condenser. any subs here? I mean 46 bucks for a set of contacts and condenser.


about the only set of tires I have found are IRC in GS11's in 18x3.00 front and 18x3.50 rear. Not the original sizes I see, but notice that is whats on it now and they fit nicely. any other suggestions.

Dunstal pipe was rusted out, so I have a new reverse megaphone silencer on order.
ordered a b38 6 volt battery.

valve shims. (mechanic in San Diego called them "winkle" caps) Not sure how they are identified. is there a number on them? do they have a thickness measurement, so that you can calculate what size you need to order? where do you get them from? Valve measurement on the 450 non desmo. the clymer book I have and the 450 owners manual both show the measurement is .002 to .0039 inch. This seems to be a thin measurement to me on an air cooled enging. but since it is found in two sourses, it could be correct. thoughts on this?

thanks much in advance.

Mike

[Teckhardt]

Pipe hanger/rear foot rest. what size is this bolt.

7/16" X 20NF

[Bevel bob]

I would be happy with a few more thou clearance, after a re-grind the clearances close up and the caps can be rubbed down on an oil stone, caps are same as used on later desmo and some belt motors and can be ordered. Looser is better than tight.Some car points fit ,research needed.

[DewCatTea-Bob]

" the tank is supposed to have a shouldered sleeved rubber insert on each of the front ears that are bolted to the frame.
Do you know of a substitution for the rubers and what size are the bolts "

____ The tank-bolts are about 25mm long with 8mm x 1.0mm thread.


" I think I can fabricate a proper catch for the back of the tank. "

____ You should be able to find a vacuum-cleaner belt/rubber-hose of a size that works well for that job.


" Pipe hanger/rear foot rest. what size is this bolt. "

____ Check to see if your threaded frame-tab will accept the thread that's used by (one of the three) oil-return banjo-bolts, (I think 12mm x 1.0mm thread), if it fits, then you know the size bolt to get for your job. _ Otherwise the 7/16ths fine-thread size that the narrow-case models used should work.
Expect to use at least a large washer, if not a tube-spacer, between the frame & the back of your muffler's bracket-support,, so a bolt length of 30 to 50mm (1&1/4 to 2") should be used, with washer of course. - (The stock/original non-SCR bolt is too short!)


" head pipe to head gasket. any commonly used substitutes here? "

____ There are still lots of originals around but, I've found that M.Guzzi copper-tube rings (for 750/850s) work for the job as well !


" valve shims. (mechanic in San Diego called them "winkle" caps) is there a number on them? do they have a thickness measurement, "

____ Right, the valve-stem shim-caps are called 'winkle-caps', and they have no size-markings,
and they must be measured with a mike.
Let us know what they're charging for them these days... (I may beat them, as I have a large personal supply.)


" the clymer book I have and the 450 owners manual both show the measurement is .002 to .0039 inch "

____ Those are the correct factory-figures but, I've always tried to shoot for .003" on the intake & .005" for the exhaust, (+/- .0005").


DUKE-Cheers,
-Bob

[Eldert]

footrest on early Ducati singles and the later post 68 singles have a 7/16 UNF thread
and so do the early bevel twins . i know this for sure because i has 2000 made up of the non folding type
and have 2000 of the folding ones on the way




so if anyone need some i have plenty

Eldert

[MotoMike]

thanks everyone for your help and please excuse my ignorance.

Bob
8mm x 1.- I find 8mm x 1.25 but don't find 8x1. Is that the thread you are talking about, or must I do more looking?

Moto Guzzi you say. I might even have some of those exhaust gaskets in the parts box now that I think of it.

was thinking about the valve lash. when compared to old solid lifter v8's I have had and my moto guzzi, I realize that the lash there must take into account the expansion of the pushrod in addition to the cam and rockers. So as is the lash so much less because there is less metal to expand and less closing of the gap due to heat related expansion?

It is a tangent, but what got me to thinking of this was a conversation I had with Charles Rice of Rennesport many years ago about his titanium push rods for the Guzzi big twins. He told me that they expanded very little, much less than the cylinders themselves, so consequently you adjust them to a loose zero cold and as the motor heats, the lash actually increases. don't know how true this is but he made sense at the time.

Eldert.

Man, for a second there I thought you said "two thousand" foot pegs, wow.

Eldert and Teckardt so 7/16 x20nf and 7/16 UNF is that the same as 7/16" x 20tpi ? I see the standard thread is 7/16 x 14tpi.
I have US and metric thread gauges on the way, so in the future, I'll be more on top of it.

regards,
Mike

[Eldert]

Hi Mike

Yes Bob is correct , its M8 X 1. thats metric fine thread . Ducati used that for the tank ,the kickstarter pinchbolt and on a widecase it was used for the pinchbolts for the rearswingarm pivot and maybe to mount the horn to
7/16 UNF has 20 tpi so it could be the same but i am not sure

the rubber inserts for the tank : Amici Dello Scrambler sell them and the clip and a spring to hold the tank to

Eldert

[Teckhardt]

Tank latch:

http://www.guzzino.com/dutalawcsi.html

Tank bushings and bolts:

http://www.guzzino.com/gastabusewcs.html

Rear peg tap:

http://www.guzzino.com/dusitwfopegt.html

[JimF]

One more resounding "affirmative" on the footrest pegs on early Ducati singles and the later post 68 singles having a 7/16 UNF thread.

This is absolutely correct, it is not that the UNF thread is "close" to some metric thread that Ducati used, Ducati actually used a 7/16 UNF thread. (It might be more accurate that Ducati's peg supplier chose the thread, but the frame is tapped to that spec.)

Don't anyone strip their frame's peg threads trying metric threaded footpegs. Buy a pair of Eldert’s - you'll find they fit perfect.

Jim

[MotoMike]

OK thanks folks and keep em coming. I stopped by the Farm and Fleet store after work and picked up some 8mm 1 x 25mm bolts and some 7/16 20 x 1.5 and some sleeve spacers as well as a bunch of various rubber washers and bushings. the tank bolts and peg/hanger bolts fit perfect. If I decide to put a set of passenger pegs there, I'll be pming Eldert.

outstanding questions from this post:
points and condenser sub
tires - would the 90/90-18 and the 90/80-18 come close? even then the pickings seem slim.

Tank latch:

http://www.guzzino.com/dutalawcsi.html

Tank bushings and bolts:

http://www.guzzino.com/gastabusewcs.html

Rear peg tap:

http://www.guzzino.com/dusitwfopegt.html

Teckhardt
thanks for those links. I may go that way. I'm not saying I'm cheap but in the spirit substitution, I might try to make a few of these parts. But the little tank latch has me tempted, but it reminds me of some part I have seen elsewhere in the hardware isles