H2 carb set up

Ben · Post by **Ben** » Fri Jun 26, 2015 8:43 pm

Hi guys
Just joined ,so new to all this but hopefully may get help from a technical boffin.
Rebuilt 1971 H2 and going for mot in the morning,just not sure about the carb setting
Using the jets that were fitted,105 mains,35 pilots needles are on 3rd clip , any advice on what it should be would be a big help
If it sort of runs ok I will bring it to the mcn tomorrow as its only 15mins away.It has had the Chris Appleby treatment so all pretty tight.
Cheers

Post by **Wolfie** » Fri Jun 26, 2015 9:27 pm

That's a fair starting point but how does the bike run?

You only need to fiddle if the bike doesn't run well

Mraxl has some "readers settings".. in the "restoration & how to.." section.

This is the website for all Triplers..

Post by **Wolfie** » Fri Jun 26, 2015 9:34 pm

You'll find it's quiet on here this weekend.. all the boffins will be at MFNs by now.

Ben · Post by **Ben** » Sat Jun 27, 2015 10:14 am

Cheers,
Just getting sorted to get its mot???
Then try and get across to eastwood

El Presidente · Post by **El Presidente** » Sat Jun 27, 2015 2:06 pm

Wolfie wrote:You'll find it's quiet on here this weekend.. all the boffins will be at MFNs by now.

.
Not ALL of them
.
Setting are good but its going to be very rich, you need the needle clip 2nd from the top

Malcolm · Post by **Malcolm** » Sat Jun 27, 2015 4:31 pm

El Presidente wrote:
Wolfie wrote:You'll find it's quiet on here this weekend.. all the boffins will be at MFNs by now.
.
Not ALL of them

Me too, wish I could be there

.

Ben · Post by **Ben** » Sat Jun 27, 2015 9:37 pm

Hi guys
Got the h2 mot no prob, but right hand pot exhaust wasn't half chucking out smoke compared to the other 2.
Just wondered if it needs the oil pump mod.
Also going to set the carb clips to 2nd pos , but being run in may be better staying rich for a bit .

Cheers
Any help about the pump much appreciated

Barrie · Post by **Barrie** » Sat Jun 27, 2015 10:09 pm

It's not the pump.
If it does not clear after a mile or 2 its the right hand outer crank seal letting gear box oil into the crank case, disconnect the pump pipes , pull off the clutch cover, remove the primary gear and clutch complete, you then will see the seal, remove and replace , reassemble and replace the cover, job done.

For a '71 H2 you should be running on the 3rd or 4th groove on the needle from memory, if your sure the bike is rich enough mid range, then probably you have not rebuilt the carbs , and the needle jets and needles are worn

El Presidente · Post by **El Presidente** » Sun Jun 28, 2015 3:52 am

Barrie wrote:It's not the pump.
r

It could, and most likely is the pump, the early H2's had issues with the right hand cylinder over oiling because of the end cap O ring on the pump failing, the rebuild kits are long gone . . .. .IF it is the crank seal, then I assume (?) that you just rebuilt the engine, if so, then you will certainly smell that the R/H cylinder is burning tranny oil instead of 2 Stroke oil - Good luck with it & keep us posted

3rd or 4th Needle clip setting would be way too rich for normal use, especially with the 105 mains :wink:

Keith500 · Post by **Keith500** » Sun Jun 28, 2015 8:09 am

hi rick are the pump rebuild kits the same as ah1 kit? if so i have some

also one thing to add have you checked the float hights they will balls things up if they are to high alsi are all the carb galleries free even if you have has them sonically cleaned they may still be blocked air passages

Keith500 · Post by **Keith500** » Sun Jun 28, 2015 8:16 am

and an other thing check the choke cable and make sure its not tight and did the plungers get replaced ?

Keith500 · Post by **Keith500** » Sun Jun 28, 2015 8:57 am

hi, ben ring me pm sent

Barrie · Post by **Barrie** » Sun Jun 28, 2015 9:20 am

Just looked up the settings for early H2's, needle should be on the second groove

Keith500 · Post by **Keith500** » Sun Jun 28, 2015 10:42 am

Hi ben the early settings were modified to 97.5 mains to stop them running rough at the bottom end mine runs on those and is now well sorted .

Barrie · Post by **Barrie** » Sun Jun 28, 2015 6:15 pm

If your carbs have the i.d H2,
the factory specs should be, 105 mains ,o-6 needle jets 5 fl14-2 needle, 35 pilot jets

Keith500 · Post by **Keith500** » Sun Jun 28, 2015 8:32 pm

barry try looking at the workshop manual they were changed after i think 5000 due to naffing plugs up and bad running mate

Barrie · Post by **Barrie** » Sun Jun 28, 2015 8:49 pm

This why you need to know the carb id,
a '71 H2 is early and could possibly still have an early set of cylinders fitted.

scouse · Post by **scouse** » Sun Jun 28, 2015 9:10 pm

Early carbs where replaced under warranty because the heavy slides had a habit of snapping needles and the ending up wreaking the engine
The most important thing is to balance the carbs
H2 build quality varied greatly, what is good for one might not necessarily be good for the other, personally I would follow Ricks advice
As he has had more H2s than anyone else on this board

Just my 2p

Gary T

Keith500 · Post by **Keith500** » Sun Jun 28, 2015 9:26 pm

barrie mine has square ports ect h2 on the carbs and runs spot on with the 97.5 ???? no kangarooing at low revs as scouse says take time setting the old girl up everything is critical in getting a bike that runs well

Ben · Post by **Ben** » Sun Jun 28, 2015 9:50 pm

Hi guys
Been away,good to see the grey matter fully operational.
Lot of knowledge here.
It's a late 71 h2 , the carbs have h2 stamped on them.
I have changed the gasket and the fuel inlet valve,the floats are at approx 25mm just touching the valve spring. It did have 102.5 mains but ran erratically so I already had some spare 105 jets and swapped them but left the needles on the 3rd clip??

The engine has all new seals from jessbikes , crank balanced ,overhauled with labyrinth seals , rebore, wiseco Pistons ,

Just also noticed head gasket weeping so have taken the RHS pot off to re seal,all looks good in the cylinder.was worried I'd blown something from the smoke ,I think by the smell its Defoe the 2 stroke oil burning.i am just using fully synthetic oil I already had,

It's actually a bike Rick originally imported years ago.

Ben · Post by **Ben** » Sun Jun 28, 2015 9:55 pm

Keith500 wrote:hi, ben ring me pm sent

Hi Keith sorry been away ,just posted a load more info, getting a bit cheesed off with how it runs ,seemed very jerky at low revs
Was fine at half throttle??
Cheers
Ben

Barrie · Post by **Barrie** » Sun Jun 28, 2015 10:08 pm

scouse wrote:Early carbs where replaced under warranty because the heavy slides had a habit of snapping needles and the ending up wreaking the engine
The most important thing is to balance the carbs
H2 build quality varied greatly, what is good for one might not necessarily be good for the other, personally I would follow Ricks advice
As he has had more H2s than anyone else on this board

Just my 2p

Gary T

Well, I have an early H2 with the original carbs heavy springs and chrome plated slides, these are carbs marked with the id H2,modified carbs are marked H2-1, 2 or 4,so when tuning or rebuilding I have always started from the published factory carb specs which is on the resources site

Kawasaki Triples Club

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