Sent from my iPhone using Tapatalk
What Paul said x100000... didn't think it would come out so clean!Wow......just wow.....I am so impressed.
When this engine swap was first described, I thought that the final outcome was going to look like a garishly-oversized motor sticking awkwardly out of an obviously too-small frame.....but that proved not to be the case at all. Based on your most-recent photo, the bike looks pretty well-proportioned, with a more-muscular, beefy look to the engine area. It works. It looks good. And importantly, you brought this ambitious task to a fruitful completion, where many others might have gotten stuck along the way and never finished. I extend my highest compliments to you.
$678.89 w/hondagrom.net discount for the engine mount kit, chain, rear sprocket, header pipe, shift lever, (Ordered from Steady Garage)Looking so good nema741! But I have a question for you that isn't really clear to me yet. What are the total costs that you spend on this whole project? Because it's a really interesting mod that makes the Grom so much more mature and usable.
I think finding a used 250cc or 300cc Honda engine is the most difficult and expensive part. How difficult would you rate this mod on a scale of 1 (total mechanic noob) to 10 (true mechanic jesus)?
Looking forward to more pics and info!
Thanks for the write up man! Really appreciate it.$678.89 w/hondagrom.net discount for the engine mount kit, chain, rear sprocket, header pipe, shift lever, (Ordered from Steady Garage)
$250 Engine, Radiator, Throttle body (local sale, right time right place, got very lucky)
30$ CBR250r Wire Harness off ebay.
12$ CBR250r Coil & plug wire off ebay.
22$ CBR250 Cooling Fan for radiator off ebay.
9$ CBR250 Injector hold down cap off ebay. (plastic fuel adapter that holds the injector in the TB, engine owner couldn't find it)
Approx 8 hours of my time from the strip down to the complete build. Minus "3" things that I have not completely finished yet. Final mount for exhaust, license plate & radiator mount.
All in all $1,002.00 I also sold my BBK & other accessories that I had which paid for the bulk of this swap. I still have my koso DB-03 cluster, entire stock grom motor, stock cluster, grom sprockets to sell which will more than cover the cost of my entire swap.
Also, I bought a CBR250 fuel line which I was going to change out my smaller line from the grom, however the clips that hold the fuel line to the throttle body and underside of the tank didn't come with the line I got off ebay. Interestingly enough I'm using the stock grom fuel line with the CBR250 and have ZERO fuel delivery issues. Even know it is significantly smaller. Starting to think this entire "larger" fuel line conversations really are not necessary. My BBK ran just fine with the stock line as well......
My friend has a 204-4v grom using the Koso 4v head and he has beaten most of the 250-300cc transplant grom around here in the Bay Area and only lost to the new Honda rebel 500 by a bike length.Yup, that's ALOT less than my 170 4V build. I think I'm close to ~2K in so far (99% done), and that's not even counting the Aracer gear. Honestly it's probably a good thing I don't know the exact number. All those supporting mods add up!
Love how the end result looks!! Beefy as hell.
I wonder what a tuned 170 4V and a 250 swap would look like drag racing. Power numbers between them are similar, but one is a bone stock Honda engine, and the other is a grenade I assembled in my living room...
By the time everyone switches to 250-300cc water cooled,6 speed groms, honda will come out with there OEM water cooled units or even a new gen grom with 13" wheels water cooled 6 speed sort of like their proto typea well tuned 200+ 4v setup will givve a 250-300 stock swap a run for the money and probably surpass it. however, for the long haul/endurance, the 250-300 swap is the way to go. you are pushing the limits of with the 200+ 4v bbk setups so reliability over the long haul will obviously drop. with that said, i'm still up in the air going 4v or 250-300 swap. both have the pro's and con's. when riding at a spirited pace in the canyons/track, i might prefer a high revving lower torque setup so it's less likely to break the rear loose coming out of a turn.
My $9k Grom was totaled and this is something I have put a lot of thought into over the last seven weeks as I plan the replacement.i want a 250 or 300 grom. the bad thing i have no room and prob cant be without it for a long period of time so i would prob have to pay someone to do it.. i cant even find used cbr 250 for super cheap.. and have no clue where to get brand new engine from. so not really sure how much a overall price would be to do it. though i would have to do suspension also.
but ya its two things i want to do to my grom eventually. have you done swaps before?
i never have. how long does it even take? for a first time.. to also someone who has done it before.. ?
not sure how much a good price would be to even pay someone to do it if i already had all the parts.
gl with it man.. groms should have came 6 speed 250s... to me the industry is a joke. they can make 1000 and more cc rockets
but not a 250cc minbike..
@Dutch-MG: I was already looking on the Dutch marketplace for an engine:Thanks for the write up man! Really appreciate it.
I'm going to be on the lookout here in The Netherlands for a 250/300cc motor. Until then I'm going to learn to do some more maintenance stuff and practice soldering.
Would appreciate the PDF file once it's finished