mongruel getting a 86 1200 engine added to the bloodline

[dan filipi]

Interesting mod there ekvh, keep us updated!

 

[ekvh]

I put the head back together and mounted everything to turn it over tonight. Then I removed them to be sure there's no contact and there isn't. I think my cutouts are now about 0.090". The 1000 pistons are 0.110". I wil try and get some clay and check how much clearance I really have.

 

[joedrum]

seems like i need camera betteries as always when i need to take pics something always in the way

 

[joedrum]

well ive looked at at the pics i could and im going to to ekvh work the serious i beleave everything he done and trust it ....personaly im going one step more caveman like and just artwork it by hand with my 4" grinder ...this will save a lot of time ...i wouldnt expect others to follow me on this as im quite good with tools that operate with hands ...but im going to try and takes pics :builder: :mrgreen:

 

[ekvh]

Great cavemen think alike!! I was going to do that but chickened out. I think it could be done, but with great caution. It appears to me that the top of the cutout is maybe all that needs to be removed.

 

[joedrum]

thanks ekvh ive got two cut already and pretty much doing as you said taking out some rim and then just a little more easing it out some towards the center ...just a skiming soulnt be to long before i test a head

 

[ekvh]

The 1000 cutouts are a lot closer to the outer piston edge than the 1200's aren't they. The reason for the move by Honda was supposed to be to centralize the charge and squish better. It looks like that will still be maintained, just a bit more charge getting in......we hope. It will be fun to try different intake runners, like from the 1100 to see if it's any better or not.

 

[joedrum]

okay i have one head on and it went through first test ...need to adjust valves tight now and try again ...its so nice putting belts on motor on stand like i have it ...so far good :builder: :mrgreen:

 

[joedrum]

well it seems fine so far ive checked clearence too and it seems as good as any oldwing has...time for second head now ..i have a alinement pins stuck and corroded that has to come out

 

[ekvh]

I used a 13/32 drill bit with the non-spiraled portion inserted into the alignment pin, then a pair of vise grips to squeeze them. It took a fair amount of back-and-forth twisting, but I got them out and usable for a change. I think 27/64 would be better if you have one. I didn't. Someone on NGW posted it a long time ago. Can't remember who, but thanks anyways.

 

[joedrum]

hmmm maybe i have one..that be nice

 

[joedrum]

it appears the 1100 gaskit or 1000 gaskit is hitting the piston some im not for sure what it is probanly after market but it dose make clear that using 1100 heads over 1000 is a good idea ...the narrower milling on the 1000 heads bring the 1200 piston and 1000 combustion chamber right there ,,,anyway not a problem for me im going to make gaskitwork and proceed on the testing of the second head :mrgreen:

 

[joedrum]

well things went good today ...got the alinement pin out ...thanks ekvh on the ideal ...i found a 1/4inch drive tapered socket to fit pin and turned it out ...clearence is good ...at the credicle points i could turn the adjusters down five turns i think it was till valve contacted piston ...ill try and get batteries tomarrow for camera :shock: :mrgreen:

 

[backlander]

opcorn: opcorn: This is fascinating. opcorn: :thanks:

 

[joedrum]

thanks mike its been a long time me getting to this day cant beleave i got it all cut in one day ...a lot of credit gose to the work ekvh did .....i trusted his work and didnt feel the need to repeat it ...and had at it knowing exactly where the trouble spot was ...and its tested out good...im just hoping the gaskits i got are for a 1100 and not 1000 ... :builder: :mrgreen:

 

[backlander]

This info might help you determine which gaskets you have joe. This info is the property of Randakk's cycle shak.https://www.randakks.com/TechTip85.htm

 

[ekvh]

You should be able to measure the piston diameter of the gasket to see what you have. Gl1000 was 72mm or 2-27/64. The 1100 is 75mm or a bit over 2-15/16. I haven't read the above Randall link yet, but I thought 1100 and 1200 used the same gasket. The 1200 piston is only 1/2 mm or 1mm bigger than the 1100, depending on your source. Like a dummy, when I first tried mine, I left the 1000 gasket on and the piston of the 1200 stopped dead hitting the metal ring of the head gasket. Using my eye and my finger, the 1200 piston comes out a little proud of the block. I may have missed this, but are you using 1100 heads with 1000 cams?

 

[joedrum]

yes i am useing 1100 heads with 1000 cams 75-77 yr

 

[ekvh]

Some other stats that don't add up, are that all three bikes had a 61.4 stroke. The 1200 has to have a longer stroke because adding 1mm to the 1100 numbers won't get you to 1200 cc. I think it's advertised at 1181 which would give it 4.6 mm more stroke to get to 1181 depends on whether piston is 75.5 or 76mm. motorcyclespecs.co.za/ h as it listed as 75.5 x 66 which computes to 1181. Since it adds up, that's what I'm going with. This is going to come into play when using the 1000 carbs and manifolds. This is almost 3/8 of an inch to stretch the boots. Seems to be too much, but since the piston on the 1200 stands proud maybe it'll be less as Steve reported. I hope the intake runners can be used without chasing air leaks. Using the internet for facts gets less reliable all the time. Real, actual measurements will tell the story.

 

[joedrum]

yes lots of false info even from randakks....well im glad that things get worked out through experience and can be relied on ....like your work ekvh...yes the carbs will have to be spread some as you say ...im thinking it wont be much of a peoblem ..but not there yet ....its amazing how many 1100s out there with 1000 gaskits on them ....im glad you had the same experience with the 1000 gaskits....well out tosee if the gaskits i got will work and if i have the orings it takes ..... :builder: :mrgreen: