Topic: Modern Keihin CR31s & HiPo engines

[lordmoonpie]

Ha ha Thanks Mick & Johno, but I'm the other side of 50 - 45 tomorrow in fact. Who are these Beatles lot then they sound OK? ;-)

[turboguzzi]

happy birthday man!

agree on not running a new motor too much without load and taking it ASAP to a dyno or track.

 5000 rpm idle?  have you synched the carbs at least visually? could be the reason for cyl 1 running rich and smoking after turn off too

[lordmoonpie]

Thanks TG :-)
Track session planned but not for two weeks so the anticpation is hard to bear. Anyway, more progress today....the longer oil cooler brackets are on to hold the swaged collars away from the bracket mountings so there is no chance of vibration wearing them through. Then, on to the compression test. First time I've done one of these I have to say so it was fun having a go.

The following readings are what I got - throttle wide open, cold engine, dry test - no oil added to the bores and to my untrained eye at least, they look pretty good!

Cylinder #   1      2      3     4
pressure    140  135  138  136

So - all good strong readings and all very consistent with a 3.5% spread. Interesting that old smokey is the best value....I'm starting to think it is a fuel washing/ring type problem. Might now stop fiddling and leave it until the trackday to check it all out.

I have three other niggly jobs to sort now:
1. glue left grip on - whatever glue I use, it always seems to come off!
2. sort out the many small oil leakes from bolts on the bottom of the engine. All torqued up right and all clean but can I stop the little leaks!?
3. deal with the front cylinder head corners touching the fairing. I'm thinking either plumber's mat inside the fairing to stop heat transfer or maybe adding a bar across the fairing to hold it clear. If I had time I'd investigate cutting the fins back like Eric has done but I don't so it'll need a Heath Robinson solution for the short term.....and that hopefully is that!

And to top it all, my sister sent me a gift card for Machine Mart for my birthday so I can go get a leakdown tester and some other goodies, the Ducati 888 passed it's MoT roadworthiness test today and is good for another year and tonight the Wife is cooking steak and we're planning to watch TT3d closer to the edge.....today has been great :-)

[simon#42]

happy birthday simon
 use hair lacquer for the grip [ sam may have some he doesn't use ] and enjoy the tt dvd , its not bad once you have got passed the fact that guy martin is a complete dick head .

[lordmoonpie]

Thanks Simon - hair lacquer eh? never tried that one but ti does stick like the proverbial wotsit to a blanket so good shout, I'll see what I can do....not sure they had hair lacquer in Sam's days though, I think they just used brontosaurus grease 

[Tintop]

Happy Birthday, your catching up to some of us older guys.

re the grips - safety wire them, end of any issues.

[lordmoonpie]

Thanks Tintop 

I did have the grips safety wired and they still moved under your hand - I think I must have super shiny clip ons or something     

[Tintop]

Ok I see your issue now.  Maybe go over the grip area with some very fine emery paper.  I used carb clearner (& safety wire) for the Renthals on the sidecar, clipons are powder coated.  They haven't move at all.

[JohnN]

Simon:
I've also used hair spray in the past but it can loosen up in the rain. I recently tried "grip stick" but it did not work so I switched to Threebond "Griplock" and my grips are secure. I think it is basically contact cement which is also an option. It may rain at the Isle so be careful!

On my CR I have contact between the fairing and 1-4 headers which has me concerned but to date there is no evidence of heat damage, even to the paint.

How are you progressing on carburetor setup? Since my last response on settings I switched to 125 mains and then to 130 main jets for my last race weekend. I'm still sorting through  ignition setup but the carburetor seems to be right for my combination.

John

[lordmoonpie]

Simon:
I've also used hair spray in the past but it can loosen up in the rain. I recently tried "grip stick" but it did not work so I switched to Threebond "Griplock" and my grips are secure. I think it is basically contact cement which is also an option. It may rain at the Isle so be careful!

On my CR I have contact between the fairing and 1-4 headers which has me concerned but to date there is no evidence of heat damage, even to the paint.

How are you progressing on carburetor setup? Since my last response on settings I switched to 125 mains and then to 130 main jets for my last race weekend. I'm still sorting through  ignition setup but the carburetor seems to be right for my combination.

John

Thanks for the input John - I'm really interested that you've had no heat damage to your paint down to the 1/4 contact patch. In that case I think I might just insure myself against that by going the plumbers mat route. A piece at the contact point will not make it appreciably thicker and may just disperse any heat if it builds up. Really useful experience thanks 

Haven't heard of griplock either so I'll investigate that too. I have been using renthal grip glue but it seems a bit weak to me. I used to use old fashioned "water glue" and never had a problem but that's been harder to find to buy lately.

On the carb front, I've used the good Doctor D's setting for now. I'll see on the up coming track day what the plugs come out like as I'll get a chance to do a full throttle plug chop. Should be an interesting day - especially as it's one of the few full noise days that run each year, it brings out some proper exotic museum pieces sometimes so is great fun to watch the other groups while waiting for your next turn. Last time I went we had a Hailwood factory 250-4 on track, awesome!

Manx GP is normally drier in the IOM than the TT....but you're right, that doesn't count for much LOL