What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

Pierre zoomzoom /

Currently running a 86 main in my 19mm Dellorto PHBG and it's unfortunately too lean (soft seized it about 2 times already but still runs like a train). I hit 50mph on this current set-up. Gonna re-bore it and I'd like to get the jets set right. Yes, I can just buy a bunch of jets and plugs and chop away, but I'd like some insight on what you guys think I should be running. Nothing too similar to what I'm running on the spreadsheet in my area either.

Thanks fellas,

Pierre

Specs:

E50

Case-matched 65CC MetraKit

43.77mm overbore Mahle Piston (going to be a 43.9)

19mm Dellorto PHBG

86 main

42 idle

90 degree bend Malossi filter

Techno Boss pipe

Rito crank

Fresh bearings and seals

3-shoe

Re: What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

Overpriced Parts /

Seized from too high of timing/too high of head temp

The two specs you didn't type are what seized your kit.

If you were running a head temp gauge you would see when it got to 380 some degrees and you could have shut it down saving your kit.

You need low timing 16-17 degrees mm on flywheel and less then 400 degrees F on head temp gauge or you will seize again and again silly

Re: What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

I had a 45 idle with mine and I wasn't at sea level, and I believe a 90 main.

Re: What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

Pierre zoomzoom /

@Ken, so are you saying my jets are ok? Can bad timing (too high) get me a lean reading when I do a plug chop?

Thanks

Re: What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

Overpriced Parts /

Timing before jetting. Your plug readings mean little on a auto trans moped .

You are seeing a all around plug reading not a wot reading because you can't pull in the manual clutch like a motorcycle has when you hit the kill switch stopping raw gas from hitting the hot plug plus your not cutting open a new plug ( a real plug chop )and reading it at the bottom of the insulator after a WOT run anyway.

Kits seize from hot temps even if you have perfect jetting and oil mix you will seize if you have hi timing.

Most people on this forum seize because of high or stock timing though many blame it on other things because they don't want to admit they don't know how to time with a timing light.

Re: What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

Pierre zoomzoom /

Ken Roff Wrote:

-------------------------------------------------------

> Timing before jetting. Your plug readings mean

> little on a auto trans moped .

> You are seeing a all around plug reading not a wot

> reading because you can't pull in the manual

> clutch like a motorcycle has when you hit the kill

> switch stopping raw gas from hitting the hot plug

> plus your not cutting open a new plug ( a real

> plug chop )and reading it at the bottom of the

> insulator after a WOT run anyway.

> Kits seize from hot temps even if you have perfect

> jetting and oil mix you will seize if you have hi

> timing.

> Most people on this forum seize because of high or

> stock timing though many blame it on other things

> because they don't want to admit they don't know

> how to time with a timing light.

Well I definitely know how to time with a timing light, just thought the jetting was off. Thanks for your help Ken. Timing shall be done when I get it back together. Is there a certain degree it should be to?

Re: What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

Overpriced Parts /

16 degrees or mm BTDC on the flywheel is a good starting point .

If you run cool ( low mid 300 degrees F ) you can add timing

Re: What Jets for MK65 E50 Dellorto PHBG 19MM Puch in Bay Area, CA?

I run a 42 idle, and a 86 main. I am not in the bay area,but I think you should be around that jet range.I think it must be your timing also.I have my timing set at 17degrees btdc.Are you breaking your kit in with non synthetic mix,and mixing it a little rich for break in?A trail tech really will help. (edited)

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