Monza gp running hotter

[Bensmith225]

bought a gp about 6 months ago with a used monza 225 bolted onto a brand new SIL engine with all standard internals and a lightened flywheel running a dj exhaust and a dellorto phbh30 with a 55 pilot av266 atomiser x2 needle on second clip and a 135 main. Ran rough low down the clutch slipped like a bitch and I didn't trust the crank or the chain tensioners so I swapped the crank for a welded men crank with new bearings and seals throughout along with tensioners and 5 plate clutch, the last thing I changed was the exhaust to a tsr evo about a month ago. I've upped the main jet to a 135 but everything else remained the same. Plug colour looks good and it revs nicely all the way through. The problem now is that my cht gauge was is reading a lot higher than it was with the old dj exhaust (between 130'C to 145'C ) used to top at 110'C with the dj on it, im baffled as to what's causing it to run so hot