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Old 08-17-2008, 10:54 AM   #2761
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Re´nstall all the bearings, I had it with a R&B engine where the frontbearing was not seated well.
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Old 08-17-2008, 05:15 PM   #2762
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Re´nstall all the bearings, I had it with a R&B engine where the frontbearing was not seated well.
Roelof

This is a brandnew engine
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Old 08-17-2008, 05:43 PM   #2763
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Can someone tell me how many shims do I need for a Novarossi 353 and a 12-3SCT if I use 20% fuel???
Not sure about the 353. but I measured my 3SCT tuned and with no shims; it has a real head clearance of a .20mm so for 20% i would add .25mm shim. the engine comes with a .30mm shim. I install an additional .1mm with the .30mm shim for 25% which gives me a total head clearance of .60mm. A little fat for 25% but better to be safe.


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Old 08-17-2008, 05:48 PM   #2764
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Not sure about the 353. but I measured my 3SCT tuned and with no shims; it has a real head clearance of a .30mm so for 20% i would add .15mm shim. the engine comes with a .30mm shim. I install this for 25% which gives me a total head clearance of .60mm. A little fat for 25% but better to be safe.
Adding .40mm of shims would get around .70mm head clearance this is a little too much for 20% your low end will suffer.


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Would you think between the Tuned and the Non-Tuned version the head clearance would change?
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Old 08-17-2008, 07:31 PM   #2765
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Would you think between the Tuned and the Non-Tuned version the head clearance would change?
To be honest I'm really not sure. I don't want to give any wrong information
I can only speak for the 3sct tuned version. But my gut says they would be the same. I don't think they would change the stroke between these two engines. Maybe timing not stroke. Again I'm really not sure.



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Old 08-17-2008, 11:26 PM   #2766
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Roelof

This is a brandnew engine
Thats what I thought too but it happens more than you think!
There is no 100% flawless production...
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Old 08-17-2008, 11:41 PM   #2767
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Thats what I thought too but it happens more than you think!
There is no 100% flawless production...
I got the nova bearing install tool. will heat it up a little and smack it.
I will let you know what I find when I get home soon
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Old 08-17-2008, 11:45 PM   #2768
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If that doesnt work I will shave a bit off the collet
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Old 08-18-2008, 07:07 AM   #2769
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Default shimming...

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The difference is most likely in the flywheel collet. Some are thicker than others. A thick collet against a flywheel that needs a thin one would move the whole assembly 1-or 2 mm futher down the shaft, thus eating up the play that you would normally have.
yup, thought of that... but if i remember correctly, i did try 2 collets and used the best of the 2 but still need to shim it out a bit more...

unless i need to get a special collet, i used the collet that came with the engine...

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Old 08-18-2008, 07:54 AM   #2770
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Usually the black steel ones that come with most Nova motors work perfect.

Another option is to find a NTC3 clutch bolt and shim kit. It comes with a few tiny little shims that fit over the bolt between the end of the crank and the holder/retainer whatever that thing is called (the piece the thrust bearing rides on). That can give you the few tenths of a mm you need.
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Old 08-18-2008, 08:06 AM   #2771
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Hi, I was wondering if anyone could give me the factory settings, including mid speed needle, for the MR12 with turbo head? Any help would be appreciated!
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Old 08-18-2008, 08:24 AM   #2772
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The mid needle should be flush with the carb body. Don't recall the others.
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Old 08-18-2008, 04:22 PM   #2773
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Originally Posted by Bad Mika View Post
yup, thought of that... but if i remember correctly, i did try 2 collets and used the best of the 2 but still need to shim it out a bit more...

unless i need to get a special collet, i used the collet that came with the engine...

Bad Mika

I had the same issue.
I shaved .5mm of the the collet by sanding it on emery cloth making sure it was taken off like it was machined off.

It did the job, I just get .3mm endplay, with .4mm fly wheel to crank case clearance.

I have a GRP .21 and only have .4mm of clearance with standard GRP collet.

Not sure why I was the only one with the problem because I can install clutches blindfolded.
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Old 08-18-2008, 05:08 PM   #2774
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Why is there like 2 holes on the sides of the crankcases of Nova .21 engines.
When attaching the header do you wrap one large spring all the way around and 2 smaller ones on either side because I only got one large spring with my header.
Im new to Nova .21 engines as I have always run Ninjas and GRPs

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Old 08-18-2008, 05:20 PM   #2775
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Yep I three spring them. One long one and two short ones.
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