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rkjjeep
  • Rank:XL Board Member
  • Posts:9
  • From:USA

Date Posted:09/30/2017 10:46 AMCopy HTML

I recently bought a 72 250 and the original owner had a mechanic install some kind of 298cc piston kit.  Runs well but VERY difficult to kick.  I get it up on TDC and then it takes my entire 235 lbs to kick t over.  Normal?
Davy123 #1
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Re:Hard to KICK

Date Posted:09/30/2017 7:43 PMCopy HTML

take it just over compression then kick it 
tuscarawas #2
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:Hard to KICK

Date Posted:10/01/2017 2:05 AMCopy HTML

A stock XL 250 has a 9.1:1 compression ratio. A powroll 298 kit has a compression ratio of 9.5:1. If that hard to kick over you might have something like this piston in your XL. Photo courtesy of this place. http://xlintperformance.com/index.php/parts/87-engineparts.html

dirty_rotax #3
  • Rank:Silver Member
  • Posts:63
  • From:United Kingdom

Re:Hard to KICK

Date Posted:10/01/2017 4:39 PMCopy HTML

 I have a powroll 300 kit fitted to my XL and it also is a pig to start due to the compression, I can almost stand on it and it wont move, just keep taking small kicks to get over tdc then lunge, works for me, piston is not the high comp as pictured, still a flat top
rkjjeep #4
  • Rank:XL Board Member
  • Posts:9
  • From:USA

Re:Hard to KICK

Date Posted:10/01/2017 6:58 PMCopy HTML

Thanks, I think I have the flat top kit.  I just need to put my good boots on from now on!
Davy123 #5
  • Rank:Platinum Member
  • Posts:278
  • From:Scotland

Re:Hard to KICK

Date Posted:10/02/2017 5:39 PMCopy HTML

or fit a compression release from a chainsaw.. works a treat
JKCanuck #6
  • Rank:Bronze Member
  • Posts:27
  • From:Canada

Re:Hard to KICK

Date Posted:10/08/2017 9:18 PMCopy HTML

      When I bought my second TL250 (I've got 2 TLs and a K0 XL250), the PO claimed that it had a Powroll "stroker" kit in it.  It didn't run, having practically no compression, so I tore it down all the way to check internals, trans and such.  It did not have a stroker crank, just the stock 57.8mm stroke, but it did have a big bore (80.75mm).  The rings were not 80.75mm, more like 79mm from an XL350; hence, no compression.  I wasn't able to quickly find any rings to fit, although the piston is definitely one of the Powroll big bore units. It looks exactly like the piston shown on the XL Page "XL Express" a powroll build.  I've heard that Powroll shut down but may be reborn. I will try to track them down.  In the meantime, I put on another spare barrel and piston (std) I bought for the other TL250 to get the "new" one up and running.

     I wonder if any of our XL or TL compatriots have any idea where I might lay my hands on original Powroll or non-original rings with the necessary dimensions.    bore: 80.75mm (3.179in)   width  1st ring: 0.0625in (1.5mm)   2nd ring: 0.0625in (1.5mm)  oil ring 0.125in (3.0mm) or aftermarket rings of those dimensions. 81.00mm rings could be modified one supposes, because 80.75 is such an odd number as bores go. Hopefully, the XL TL crew can offer their insights.

tuscarawas #7
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:Hard to KICK

Date Posted:10/09/2017 3:35 AMCopy HTML

I bought a 340 kit from Powroll in the late 80's or early 90's, not sure of exact year. It was in need of a new piston and rings about 4 years ago. Powroll was out of business and I was unable to secure new parts so I sold the used kit . I too have 2 TL 250's. One I ride and the other I use for spare parts. I was thinking of installing a XL 350 engine with a TL transmission in the TL I ride  instead of using a big bore kit. A friend of mine owns a TL too and he has a big bore pistons and rings from xlintperformance and it runs great. Now that I think about it I should have used an XL 350 engine in my 76 XL 250 back then.


Go soothingly on the grease mud ... as there lies the skid demon! ...





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